1998 FIAT PUNTO specifications

501
Chapter 5 PartC:
Preheating system - diesel models
Contents
Glow plugs - removal, inspection and refitting 2 Preheating system - description and testing 1 Preheating system control unit - removal and refitting 3
Degrees of difficulty

Ea3y, suitable
for &
novice with little
|| experience ^

Fairty easy,
suitable for beginner with
some experience
jQ
Fairty diffctit, ^
suitable
for competent
DIY
mechanic

Difficult, suitable for
experienced DIY JR mechanic ^
Very difficult, ^ suitable fbrexpertDfY JR or professional ^
Specifications
Torque wrench setting Nm ibf ft Heater glow plugs 15 11
1 Preheating system -description and testing
Description 1 Each swirl chamber has a heater plug (commonly called a glow plug) screwed into it. The plugs are electrically-operated before and during start-up when the engine is cold. 2 Electrical feed to the glow plugs Is controlled by a relay/timer unit. The coolant temperature determines the period of heating that takes place. 3 A warning light in the instnjment panel tells the driver that preheating is taking place. When the light goes out, the engine is ready to be started. The voltags supply to the glow plugs continues for several seconds after the light goes out, If no attempt is made to start, the timer then cuts off the supply, In order to avoid draining the battery and overheating the glow plugs.
Testing 4 If the system malfunctions, testing is ultimately by substitution of known good units, but some preliminary checks may be made as follows. 5 Connect a voltmeter or 12-volt test lamp between the glow plug supply cable and earth (engine or vehicle metal). Make sure that the live connection is kept clear of the engine and bodywork. 6 Have an assistant switch on the ignition, and check that vottage is applied to the glow plugs. Note the time for which the warning light Is lit. and the total time for which voltage Is applied before the system cuts out. Switch off the ignition. 7 At an under-bonnet temperature of 20°C. typical times noted should be 5 or 6 seconds for warning light operation, followed by a further 10 seconds supply after the light goes out. Warning light time will increase with lower temperatures and decrease with higher temp-eratures.
8 If there Is no supply at all, the relay or associated winng is at fault. 9 To locate a defective glow plug, disconnect the main supply cable and the interconnecting strap from the top of the glow plugs. Be careful not to drop the nuts and washers. 10 Use a continuity tester, or a 12-voH test lamp connected to the battery positive terminal, to check for continuity between each glow plug terminal and earth. The resistance of a glow plug in good condition is very low (less than 1 ohm), so if the test lamp does not light or the continuity tester shows a high resistance, the glow plug is certainly defective. 11 If an ammeter is available, the current draw of each glow plug can be checked. After an initial surge of 15 to 20 amps, each plug should draw approximately 12 amps. Any plug which draws much more or less than this is probably defective. 12 As a final check, the glow plugs can be removed and Inspected as described in the following Section.

6*1
Chapter 6
Clutch
Contents
Clutch - adjustment Clutch assembly - removal, inspection and refitting Clutch cable • removal and refitting Clutch hydraulic system - bleeding
Degrees of difficulty
2 Clutch master cylinder • removal and refitting 5 7 Clutch release mechanism - removal, Inspection and refitting 8 3 Clutch slave cylinder - removal and refitting 6 4 General information 1

Easy, suitable for
novice with little experience oi^

Faidy easy,
suitable for beginner
with
^
some
experience
Fairly difficult, suitable
for
competent ^
DIY
mechanic ^
Difficiit, suitable for ^ experienced DIY JR mechanic ^

V<*y difficult,
jk
suitable
for expert
DIY
« or professional ^
Specifications
General Type
Clutch pedal travel (cable-operated mechanism)
Friction plate diameter 8-valve petrol engines 16-valve petrol engines Diesel engines
Torque wrench setting Pressure plate retaining bolts
Single dry plate with diaphragm spring, cable- or hydraullcally-operated according to model 140.0 ± 5.0 mm
181.5 mm 190.0 mm 200.0 mm
Nm Ibf ft 16 12
1 General information
Vehicles with manual transmission are fitted with a pedal operated single dry plate clutch system. When the clutch pedal is depressed, effort is transmitted to the clutch release mechanism either mechanically by means of a cable, or hydraullcally by means of a master
2.5 Clutch cable adjustment
cylinder and slave cylinder. The release mechanism transfers effort to Ihe pressure plate diaphragm spring, which withdraws the pressure plate from the flywheel and releases the driven plate-Where applicable, the hydraulic fluid employed in the clutch system is the same as that used in the braking system, hence fluid is supplied to the master cylinder from a tapping on the brake fluid reservoir. The clutch hydraulic system must be sealed before work Is carried out on any of its components and then on completion, topped up and bled to remove any air bubbles.
2 Clutch - % adjustment §§ ^
Note: This procedure applies to models fitted with a cable-operated dutch
release
mechanism. No adjustment is possible on models with the hydrauHcaSy-operated system. 1 The clutch adjustment Is checked by measuring the clutch pedal travel. If a new cable has been fitted, settle it in position by depressing the clutch pedal at least thirty times. 2 Ensure that there are no obstructions
beneath the clutch pedal then measure the distance from the centre of the clutch pedal pad to the base of the steering wheel with the pedal In the at-rest position. Depress the clutch pedal fully to the floor, and measure the distance from the centre of the clutch pedal pad to the bata of the steering wheel. 3 Subtract the first measurement from the second to obtain the clutch pedal travel. If this is not with the range given in the Specifications at the start of this Chapter, adjust the clutch as follows. 4 The clutch cable Is adjusted by means of the adjuster nut on the transmission end of the cable. Access to the nut is from under the vehicle. Apply the handbrake then jack up the front of the vehicle and support on axle stands (see Jacking and vehicle support). 5 Working under the left-hand side of the engine compartment, slacken the locknut from the end of the clutch cable. Adjust the position of the adjuster nut. then depress the clutch pedal ten times and re-measure the dutch pedal travel. Repeat this procedure until the clutch pedal travel is as specified (see illustration). 6 Once the adjuster nut Is correctly positioned, and the pedal travel Is correctly set, securely tighten the cable locknut then lower the vehicle to the ground.

7A»1
Chapter 7 Part A:
Manual transmission
Contents
Gearchange lever and linkage - removal and refitting 2 General information 1 Manual transmission oil level check See Chapter 1A or 18 Manual transmission oil renewal See Chapter 1A or 1B
Manual transmission overhaul • general information 4 Manual transmission • removal and refitting 3 Reversing light switch • testing, removal and refitting 5
Degrees of difficulty

Easy, suitable
for Faiity
easy,
suitable FaMycffficult, ^ Difficult,
sutable fa-
Verycfifficutt, ^
novice with
little
1
for beginner with suitable
for
competent experienced DIY * * < siitable
for
expert
DIY
jR or professional ^ experience 1
some
experience DIYmechanic ^ mechanic * * < siitable
for
expert
DIY
jR or professional ^
Specifications
General Type
Designation: 1108 cc petrol engine 1242 cc petrol engine Non-turbo diesel engine Turbo diesel engine
Torque wrench settings Gear lever support nut Gear lever to mounting Reverse gear inhibitor cable to transmission Reversing light switch Selector rod-to-gear lever nut Speedometer drive Transmission-to-engine bolt/nut
Transverse mounted, front wheel drive layout with integral transaxle differential/final drive. 5 or 6 forward speeds, 1 reverse speed
C.S14.5.10 (5-speed) or C.514.6.10 (6-speed) C.514.5.1Q/13 (5-speed) C.514.5.13 (5-speed) C.510.5.17 (5-speed)
Nm Ibftl 6 4 49 36 30 22 40 30 17 13 12 9 es 63
1 Genera) Information
The transmission is contained In a cast-aluminium alloy casing bolted to the engine's left-hand end, and consists of the gearbox end final drive differential, Drive Is transmitted from the crankshaft via the clutch to the Input shaft, which has a spiined extension to accept the clutch friction
plate, and rotates in roller bearings at its right-hand end and ball bearings at its left-hand end (on 6-speed versions the left-hand extension rotates In a roller bearing). From the input shaft, drive is transmitted to tho output shaft, which rotates In roller bearings at Its right-hand end. and ball bearings at its left* hand end (on 6-speed versions the left-hand extension rotates in ball bearings). From the output shaft, the drive is transmitted to the differential crownwheel, which rotates with the differential case and gears in taper roller bearings, thus driving the sun gears and
driveshafts. The rotation of the differential gears on their shaft allows the inner roadwheel to rotate at a slower speed than the outer roadwheel when the car is cornering. The Input and output shaftB are arranged side by side, parallel to the crankshaft and driveshafts, so that their gear pinion teeth are In constant mesh. In the neutral position, the relevant input shaft and output shaft gear pinions rotate freely, so that drive cannot be transmitted to the output shaft and crownwheel.

7B«1
Chapter 7 Part B:
Automatic transmission
Contents
Accelerator pedal micro-switch(es) - checking and adjustment II Automatic transmission filter and fluid change See Chapter 1A Automatic transmission fluid level check See Weekly checks Automatic transmission • overhaul 12 Automatic transmission • removal and refining 2 Bectro-magnetic clutch - removal, inspection and refitting 3 BectrO'fnagnetic clutch brushes- removal, inspection and refitting . 4
Electronic control unit - removal and refitting 5 Gear selector cable - adjustment 6 Gear selector cable - removal and refitting 9 General information 1 Kickdown cable - adjustment 7 Kickdown cable - removal and refitting 6 Transmission oil pump - removal and refitting 10
Degrees of difficulty

Easy,
suitable for novice
with
ittle experience ^
Party
easy,
suitable for beginner
with
^r someexperienoe ^
Faiily
difficult,
^ suitable
for
competent
DIY mechanic
^

Difficult, suitable
for fe, experienced DIY >8J mechanic
Verydfficult, ^
suitable
for
expert DIY
or professional ^
Specifications
General Type Ratios (at transmission): Lowest Highest Final drive
Torque wrench settings Esnh cable Control unit Sectro-magnetic clutch to flywheel Transmission-to-engine bolt/nut ..
ECVT (Electronic Continuously Variable Transmission)
2.503 0.497 4.647:1
Nm Ibftt 14 10 5 4 34 25 85 63
1 Genera) information
I The automatic transmission fitted is designated ECVT (Electronic Continuously Variable Transmission). The main components
01
the transmission are an electro-magnetic dutch, a variable-ratio coupling, a final drive/ differential unit, and the associated control mechanisms (see illustrations overleaf) 2 The variable-ratio coupling consists of two pulleys and a flexible metal drivebelt. The effective diameter of the two pulleys can be varied to provide different transmission ratios between them. 3 During normal driving, the transmission automatically selects the ratio giving the best
compromise between economy and speed. When the driver depresses the accelerator pedal to the floor, a kickdown effect is provided, and the transmission selects a lower ratio for improved acceleration. 4 The gear selector control resembles that fitted to conventional automatic transmissions. The control positions are as follows: P (Parking) The transmission is mech-anically locked by the engage-ment of a pawl with a toothed segment on the driven pulley. R (Reverse) Reverse gean's engaged, N (Neutral) The transmission is In neutral. D (Drive) Normal driving position. Trans-mission ratio is varied automat-ically to suit prevailing speed and load.
L (Low) Prevents the transmission
moving into high ratios. Provides maximum acceleration end maximum engine braking. 5 The engine can only be started In positions P and N. A warning buzzer sounds If the selector is in any position other than P when the ignition is switched off or when the driver's door is opened. 6 The electro-magnetic clutch consists of a driving element boiled to the engine flywheel, and a driven element spiined to the transmission Input shaft. The degree of coupling between the (wo elements Is determined by the intensity of a magnetic field generated by a current passing through windings in the driven element. The magnetic field acts on a layer of metallic powder between the driving and driven elements. When no magnetic field is present, the powder is loose and the two elements are effectively

6*172

Chapter 8
Driveshafts
Contents
Oriveshaft gaiter check See Chapter 1A or 1B General information 1 Oriveshaft overhaul and rubber gaiter renewal 3 intermediate driveshaft - removal and refitting 4 Driveshafts - removal and refitting 2
Degrees of difficulty

Easy,
suitable for ^ novtoewithittle experience ^
Fatly
easy,
suitable for beginner with
some experience
^

Fairty
difficult, suitable
tor
competent OtYmechanlc

Difficult,
suitable for experienced DIY mechanic ^
Veiydfficult, ^
suitable
for
expert DIY
or professional ^
Specifications
General Type
Lubrication lubricant type
Torque wrench settings Driveshaft nut* All models except turbo diesel (M22 plain) Turbo diesel (M24 with staking and captive washer) Roadwheel bolts Suspension strut-to-hub carrier bolts Track-rod balljolnt-to-hub carrier 'Use a new nut.
Unequal-length, solid steel shafts, splined to Inner and outer constant velocity joints. Intermediate shaft with support bearing on turbo diesel models with equal length driveshafts.
Fiat specification grease, supplied with gaiter repair kit
Nm Ibfft
240 177 280 207 85 63 70 52 40 30
1 General information
Power is transmitted from the differential to
Ihe
roadwheels by the driveshafts. via inboard and outboard constant velocity (CV) joints (we illustrations). An intermediate drive shaft, with its own support bearing is fitted between the gearbox output and right-hand drive shafts on turbo desei models (see Illustration overleaf). This layout has the effect of equalising driveshaft angles at sll suspension positions and reduces tfveshaft flexing, which improves directional stability, particularly under acceleration. The outer Rzeppa type CV joints allow smooth transmission of drive to the wheels at all steering and suspension angles. Drive Is transmitted by means of a number of radially static steel balls that run In grooves between
the two halves of the joint. The type of inboard CV joint fitted is model dependant. Those fitted to all except the turbo diesel models are of the plunge-cup type; drive is transmitted across the joint by means of three rollers, mounted on the driveshaft in a tripod arrangement, that are radially static but are free to slide in the grooved plunge cup.
The inboard CV joints fitted to turbo diesel models are of the Rzeppa type, similar to those at the outboard end of the driveshaft. On the right-hand driveshafl, the joint is bolted directly to the end of the intermediate driveshaft flange. On the left-hand driveshaft, the joint is bolted to the transmission output shaft flange.
1.1a Cross section of driveshaft - petrol and non-turbo diesel models A Transmission side B Roadwheef side

9«1
Chapter 9
Braking system
Contents
Brake disc - inspection, removal and refitting 4 Brake fluid level check See Weekly checks Brake fluid renewal See Chapter 1A or 1B Brake warning lamp check See Chapter 1A or 1B Front brake caliper - removal, overhaul and refitting 3 Front brake pad check See Chapter 1A or 1B Front brake pads - renewal 2 General information 1 Handbrake - checking and adjustment 9
Handbrake cables - removal and refitting 10 Hydraulic pipes end hoses - renewal 13 Hydraulic system - bleeding 11 Master cylinder - removal and refitting 12 Roar brake shoe check See Chapter 1A or 1B Rear brake shoes - renewal 5 Rear brake drums - removal, inspection and refitting 6 Rear wheel cylinder - removal, overhaul and refitting 7 Stop-light switch - adjustment, removal and refitting 6
Degrees of difficulty

Easy, suitable
far
novice with Sttle
experience ^
Fairly
easy,
suitable ^ (orbeginnerwith ®
some
experience
Fairly difficult, suitable
for
compe«ent ^ CHYmechanlc ^

Difficult, suitable for
experienced DIY « mechanic ^
Very difficult, ^
suitable
for
expert DIY
or professional ^
Specifications
Front disc brakes Type Disc with single-piston sliding calipers Disc diameter Petrol models with single-point Injection 240.0 mm Petrol models with multi-point Injection 257.0 mm Non-turbo diesel models 240.0 mm Turbodieselmodels 257.0 mm Disc thickness (new); Petrol models with single-point injection 10.80 to 11.10 mm Petrol models with multi-point Injection 11.80 to 12.10 mm Non-turbo diesel models 10.80 to 11.10 mm Turbodieselmodels 11.80 to 12.10 mm Minimum disc thickness (wear limit): Petrol models with single-pant Injection 9.20 mm Petrol models with multi-point Injection 10.20 mm Non-turbo diesel models 9.20 mm Turbo diesel models 10.20 mm Maximum disc runout 0.15 mm Brake pad friction material minimum thickness 1.5 mm
Rear drum brakes Drum Inner diameter (new) 180.0 to 180.25 mm Maximum drum diameter (wear limit) 181.35 mm Minimum brake shoe lining thickness 2.0 mm
Torque wrench settings Nm ibf ft
Bfeed
screw 6 4 Brake disc locating studs 12 9 Brake drum locating studs 12 9 Brake pipe and hose unions 14 10 Front caliper mounting bracket-to-hub carrier bolts 53 39 Front caliper-to-caliper bracket guide pin bolts 12 9 fleer wheel cylinder mounting boils 10 7 Roadwheel bolts 85 63

Braking system 9®5
2 Rotate the brake disc by hand and examine the whole of the surface area swept by the brake pads, on both sides ot the disc. Note: /( will bo necessary to remove the front brake pads to allow an adequate inspection of the disc's rear surface; refer to Section 2 tor details. 3 Typically, the disc surface will have a polished appearance and should be free from heavy scoring. Smooth rippling is produced by normal operation and does not indicate excessive wear. Deep scoring and cracks, however, are indications of more serious damage in need of correction. 4 If deep scoring Is discovered, it may be possible to have the disc reground to restore the surface, depending on the extent of the damage. To determine whether this is a feasible course of action, it will be necessary to measure the thickness of the disc, as described later. 5 Check the whole surface of the disc for cracks, particularly around the roadwheel bolt holes. A cracked disc mutt be renewed. 6 A ridge of rust and brake dust at the inner and outer edges of the disc, beyond the pad contact area is normal - this can be scraped tway quite easily. 7 Raised ridges caused by the brake pads eroding the disc material, however, are an indication of excessive wear. If close examination reveals such ridges, the oiicknoss of the disc must be measured, to usess whether it is still fit for use. 8 To measure the thickness of the disc, take readings at several points on the surface using a micrometer. In the area swept by the brake pads (see Illustration). Include any points where the disc has been scored: align me Jaws of the micrometer with the deepest ares of scoring, to get a true indication of the extent of the wear. Compare these ineasurements with the limits listed in the Specifications. If the disc has worn below its minimum thickness, at any point, it must be renewed. 9 If the discs are suspected of causing brake luddor, check the disc runout, using one of
me
following methods: Runout measurement -
DTI
gauge method 10 Refit the four roadwheel bolts, together
w.1h
one M14 plain washer per stud • this will ensure adequate disc to hub contact. Tighten te studs to 5 Nm (4 Ibf ft). 11 Clamp the DTI gauge to a stand and attach the stand, preferably via a magnetic oase. to the strut mounting bracket. Align the jauge so that its pointer rests upon the area of the dtsc swept by the brake pads, on an arc i mm from the outer edge of tho disc (soe illustration). 12 Zero the gauge and slowly rotate the disc trough one revolution, observing tho pointer rcovement. Note the maximum deflection recorded and compare the figure with that >«ted In Specifications.
4.8 Measuring brake disc thickness with a micrometer
Runout measurement -feeler blade method 13 Use the feeler blades to measure the clearance between the disc and a convenient fixed point, such as the disc backplate. Rotate the disc and measure the variation in clearance at several points around the disc, Compare the maximum figure with that listed in Specifications. 14 If the disc runout Is outside of its specified tolerance, first check that the hub Is not worn (see Steering and suspension check in Chapter 1A or 1B). If the hub is In good condition, remove the disc (as described later in this Section), rotate it through 180° and refit it. This may improve the seating and eradicate Ihe excessive runout. 15 If the runout is still unacceptable, then It may be possible to restore the disc by regrinding; consult your Fiat dealer or a machine shop for a professional opinion - it may prove more economical to purchase a new disc. If the disc cannot be reground, then it must be renewed.
Removal 16 Mark the relationship between the disc and the hub with chalk or a marker pen, to allow correct refitting. 17 To allow the disc to be removed, undo the two bolts securing (he brake caliper mounting bracket to the hub carrier (see illustration 3.7). Withdraw the brake caliper and mounting bracket assembly, complete with brake pads, from the hub carrier, and hang it from a rigid point on the suspension, using v/lre or a
4.18a Slacken and remove the disc locating studs ...
4.11 Brake disc runout measurement - DTI gauge method
cable-tie. Oo not allow it to dangle freely as this will strain the brake hose. 18 Slacken and remove the disc locating stud(s). Support the disc as you do this and lift it off as it becomes free (see illustrations). 19 Remove the polished glaze from the surface of the disc with sand/emery paper. Use small, circular motions to avoid producing a directional finish on the surface.
Refitting 20 If a new disc Is being fitted, remove the protective coating from the surface U9ing an appropriate solvent. 21 Locate Ihe disc on ihe hub so that the roadwheel bolt and locating stud holes are all correctly lined up; use the alignment marks made during removal. If the disc is being removed in an attempt to improve seating and hence runout, turn the disc through 180° and then refit it. 22 Refit the locating stud and retaining screw, tightening them securely. 23 Re-check the disc runout, using one of the methods described earlier in this Section. 24 Refil the brake caliper and mounting bracket assembly to the hub carrier. Coat the threads of the mounting bolts with locking compound, then tighten them to the specified torque. 25 Depress the brake pedal several times to bnng the brake pads into contact with the disc. 26 Refit the roadwheel and lower the vehicle to the ground. Tighten the roadwheel bolts to the specified torque. 27 Check the hydraulic fluid level as described in Weekly checks.
4,18b ... and lift off the disc as It becomes free

10*1
Chapter 10
Suspension and steering
Contents
Front hub bearings - renewal 2 Front suspension anti-roll bar • removal and refitting 6 Front suspension lower arm - removal and refitting 4 Front suspension lower arm balljolnt - renewal 5 From suspension strut - removal, overhaul and refitting 3 General information 1 Ignition switch/steering column lock - removal and refitting 10 Manual steering gear assembly - removal, overhaul and refitting ... 12 Power steering fluid level check See Weekly checks Power steering gear assembly - removal and refitting 13 Power steering hydraulic system - bleeding 15
Degrees of difficulty
Power steering pump • removal and refitting 16 Rear hub bearings - renewal 7 Rear suspension components- removal, overhaul and refitting 8 Steering and suspension check See Chapter 1A or 1B Steering column - removal, overhaul and refitting 11 Steering gear rubber gaiters - renewal 14 Steering wheel - removal and refitting 9 Track-rod end - removal and refitting 17 Wheel alignment and steering angles • general information 18 Wheel and tyre maintenance and tyre pressure checks See Weekly checks

Easy, suitable for nowoe with little
Jg experience ^

Fakty easy,
suitable for beginner
with
J£>
some experience
^

FaMy difficult,
% suitable for competent ^
DIY mechanic
^

Difficult,
suitable for & experienced DIY « mechsmc ^

Very difficult,
^ suitable for expert
DIY
fij or professional ^
Specifications
Front suspension Type
Rear suspension Type
Steering Type Turns lock-to-lock: Manual Power assisted Toe setting (front)
Roadwheeis and tyres See Weekly checks
Torque wrench settings Front suspension Anti-roll bar bush bracket bolts Driveshaft nut:' All models except turbo diesel (M22 plain) Turbo diesel (M24 with staking and captive washer) Lower arm balljoint to hub carrier Lower arm front bush securing bolt Lower arm rear bush securing bolt Suspension strut damper nut Suspension strut to hub carrier Suspension strut to inner wing
Independent, incorporating transverse lower wishbones and coil spring-over-teiescopic damper strut units. Anti-roll bar fitted to all models.
Independent, incorporating trailing arms with telescopic dampers and coil springs.
Rack-and-pinlon, manual or power assisted, depending on model
4.4 approx. 2.9 approx. 0° (parallel) ± 1a
Nm ibfft
30 22
240 177 280 207 30 22 95 70 70 52 60 44 70 52 50 37