1999 DODGE RAM width

AN TI- L O CK B RAK E S A FE TY P R EC AU TIO NS

1999 D odge P ic ku p R 1500
GENERAL INFORMATION
Anti-Lock Brake Safety Precautions
* PLEASE READ THIS FIRST *
This article is intended for general information purposes
only. This information may not apply to all makes and models. If
vehicle is equipped with Anti-Lock Brake System (ABS), refer to
appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section for
description, operation, depressurizing, testing, system bleeding,
trouble shooting and servicing of specific system.
WARNING: Failure to depressurize ABS could lead to physical injury.
ANTI-LOCK BRAKE SAFETY PRECAUTIONS
WARNING: Failure to depressurize ABS could lead to physical injury.
* NEVER open a bleeder valve or loosen a hydraulic line
while ABS is pressurized.
* NEVER disconnect or reconnect any electrical connectors
while ignition is on. Damage to ABS control unit may result.
* DO NOT attempt to bleed hyudarulic system without first
referring to the appropriate ANTI-LOCK BRAKE SYSTEM article
in the BRAKES section.
* Only use specially designed brake hoses/lines on ABS equipped
vehicles.
* DO NOT tap on speed sensor components (sensor, sensor rings).
Sensor rings must be pressed into hubs, NOT hammered into
hubs. Striking these components can cause demagnetization or
a loss of polarization, affecting the accuracy of the speed
signal returning to the ABS control unit.
* DO NOT mix tire sizes. Increasing the width, as long as tires
remain close to the original diameter, is acceptable. Rolling
diameter must be identical for all 4 tires. Some
manufacturers recommend tires of the same brand, style and
type. Failure to follow this precaution may cause inaccurate
wheel speed readings.
* DO NOT contaminate speed sensor components with grease. Only
use recommended coating, when system calls for an
anti-corrosion coating.
* When speed sensor components have been removed, ALWAYS check
sensor-to-ring air gaps when applicable. These specifications
can be found in each appropriate article.
* ONLY use rocommended brake fluids. DO NOT use silicone brake
fluids in an ABS equipped vehicle.
* When instlling transmittion devices (CB's, telephones, etc.)
on ABS equipped vehicles, DO NOT locate the antenna near the
ABS control unit (or any control unit).
* Disconnect all on-board computers, when using electric
welding equipment.
* DO NOT expose the ABS control unit to prolonged periods of
high heat (185
F/85C for 2 hours is generally considered a
maximum limit).

Dakota & Ram Van ..................................... .004 (.102)\
Ram Pickup ........................................... .005 (.127)\
Parallelism
Dakota & Ram Van .................................... .0005 (.013)\
Ram Pickup ........................................... .001 (.025)\
Original Thickness
Dakota & Ram Van ............................................. (1)
Ram Pickup
1/2 Ton ............................................... 1.26 (32)\
3/4 & 1 Ton ........................................... 1.50 (38)\
Minimum Refinish Thickness ..................................... ( 1)
Dakota ............................................... .890 (22.6)\
Ram Van ................................................ 1.18 (30)\
Ram Pickup
1/2 Ton ............................................ 1.22 (31.00)\
3/4 Ton ............................................ 1.27 (32.26)\
1 Ton .............................................. 1.52 (38.61)\
Discard Thickness .............................................. ( 2)
( 1) - Information is not available from manufacturer.
( 2) - Discard thickness is marked on rotor hub.









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DRUM BRAKE SPECIFICATIONS
DRUM BRAKE SPECIFICATIONS








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Application In. (mm)\
9" Drum
Drum Width ........................................... 2.50 (63.5)\
Maximum Allowable Diameter ........................ 9.060 (230.12)\
Wheel Cylinder Diameter ............................. .750 (19.05)\
10" Drum
Drum Width ........................................... 2.50 (63.5)\
Maximum Allowable Diameter ....................... 10.060 (255.52)\
Wheel Cylinder Diameter ............................. .810 (20.57)\
11" Drum
Drum Width
Ram Pickup (1/2 Ton) ................................ 2.00 (51.0\
)
Ram Van (1/2 & 3/4 Ton) ............................ 2.25 (57.15\
)
Maximum Allowable Diameter ....................... 11.060 (280.92)\
Wheel Cylinder Diameter ............................. .940 (23.88)\
12" Drum
Drum Width
Ram Van (1 Ton) ..................................... 3.50 (88.9\
)
Maximum Allowable Diameter ....................... 12.060 (306.32)\
Wheel Cylinder Diameter
Ram Van
3/4 Ton .......................................... .940 (23.88)\
1 Ton ........................................... 1.060 (27.00)\
13" Drum
Drum Width
Ram Pickup
3/4 Ton ........................................... 2.50 (63.5)\
1 Ton ............................................. 3.50 (89.0)\
Maximum Allowable Diameter ....................... 13.060 (331.72)\
Wheel Cylinder Diameter
Ram Pickup
3/4 Ton .......................................... .940 (23.88)\
1 Ton ............................................. 1.06 (27.0)\









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Fig. 7: Checking Vertical Alignment Of 2-Piece Drive Shaft
Courtesy of Chrysler Corp.
ADJUSTING VERTICAL ANGLE
If front angle minus rear angle is greater than one degree
positive (+1 degree), rear angle is too small and must be increased.
If front angle minus rear angle is greater than one degree negative (-
1 degree), rear angle is too large and must be decreased.
1) Raise and support rear of vehicle. Position a jack under
differential housing. Remove rear wheel assemblies. Loosen rear spring
"U" bolt nuts. Insert tapered shim between spring and axle spring pad.
If increasing angle, insert shim with taper facing front of vehicle.
If decreasing angle, insert shim with taper facing rear of vehicle.
NOTE: If encountering difficulty in making drive shaft vertical
adjustments on one-piece drive shafts, drive shaft may be out
of horizontal alignment. See CHECKING HORIZONTAL ALIGNMENT.
NOTE: On 2-piece drive shafts, center angle is adjusted by use of
shims between center support mounting bracket and frame
crossmember. Center angle may need adjusting if rear angle is
changed.
2) Tighten spring "U" bolt nuts to specification. See TORQUE
SPECIFICATIONS table. Recheck drive shaft angle measurements. See
CHECKING VERTICAL ANGLE.
CHECKING HORIZONTAL ALIGNMENT
1) Drive shaft horizontal alignment should be checked if
frame damage is suspected or when major components have been replaced.
See Fig. 8 .
2) Clamp a long straightedge (12" longer than width of rear
wheel track) at 90 degrees to frame side rails. See Fig. 9. Use large
framing squares to align straightedge with side rails.

remote vacuum regulator. The internal solenoid is normally open, which
causes the vacuum signal to be vented off to the atmosphere when EGR
is not controlled by the Electronic Control Module (ECM). The solenoid\
valve opens and closes the vacuum signal, controlling the amount of
vacuum applied to the diaphragm. See Fig. 12.
The electronic EGR valve contains a voltage regulator, which
converts ECM signal and regulates current to the solenoid. The ECM
controls EGR flow with a pulse width modulated signal based on
airflow, TPS and RPM. This system also contains a pintle position
sensor, which works similarly to a TPS sensor. As EGR flow is
increased, the sensor output increases.
Verify EGR valve is present and not modified or purposely
damaged. Ensure thermal vacuum switches, pressure transducers, speed
switches, etc., (if applicable) are not by-passed or modified. Ensure
electrical connector to EGR valve is not disconnected.
Fig. 12: Cutaway View Of Typical Integrated Electronic EGR Valve
Courtesy of General Motors Corp.
SPARK CONTROLS (SPK)

CYLINDER HEAD
Cylinder Head
Check cylinder head warpage. Repair or replace cylinder head
if warpage exceeds specification. See CYLINDER HEAD table under ENGINE
SPECIFICATIONS.
Valve Springs
1) Check valve spring free length, out-of-square and
pressure. Replace valve spring if not within specification. See VALVES
& VALVE SPRINGS table under ENGINE SPECIFICATIONS.
2) Measure valve spring installed height from bottom of
spring seat (cylinder head surface) to bottom of spring retainer. If
spacers are installed, measure from top of spacer.
3) If height exceeds 1.687" (42.86 mm), install a .066" (1.\
58
mm) thick spacer in cylinder head counterbore to obtain correct
installed spring height. See VALVES & VALVE SPRINGS table.
Valve Stem Oil Seals
Cup-type oil seals are used on all valves. Ensure oversize
valve stem oil seals are used when oversize valves are installed. When
installing valves, DO NOT overcompress valve springs, or damage to
valve stem oil seal may result.
NOTE: DO NOT ream valve guides from standard to maximum oversize in
one step. Ream valve guides to oversize in gradual steps so
guides are reamed true in relation to valve seat. After
reaming valve guides, valve seat runout must be checked.
Valve Guides
Check valve stem oil clearance. Ensure valve stem diameter is
within specification. Valve guide must be reamed for valve with
oversize valve stem if oil clearance exceeds specification. See
CYLINDER HEAD table under ENGINE SPECIFICATIONS. Valves are available
with stems of .015" (.38 mm) and .030" (.76 mm) oversize.
Valve Seat
Check valve seat width and runout. Grind valve seat if not
within specification. See CYLINDER HEAD table under ENGINE
SPECIFICATIONS.
Valves
Ensure valve margin, head diameter and stem diameter are
within specification. See VALVES & VALVE SPRINGS table under ENGINE
SPECIFICATIONS. Valves are available with stems of .015" (.38 mm) and
.030" (.76 mm) oversize.
Valve Seat Correction Angles
Use a 15-degree stone to lower valve seat, and a 60-degree
stone to raise valve seat.
VALVE TRAIN
Rocker Arms & Pivots
Remove rocker arms and pivots. Inspect for wear. Replace as
necessary.
NOTE: Cylinder block must be marked to indicate oversize valve
lifters. See SPECIAL ENGINE MARKS.
Valve Lifters
Measure valve lifter diameter and bore diameter in cylinder

Valve Open ............................. 200 @ 1.212 (89 @ 30.89)\









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CYLINDER HEAD








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Application Specification
Maximum Warpage ................ .00075" Per 1" (.0191 mm Per 25 mm)\
Valve Seats
Intake Valve
Seat Angle ......................................... 44.25-44.75

Seat Width .............................. .040-.060" (1.0-1.5 mm)\
Maximum Seat Runout .............................. .003" (.08 mm)\
Exhaust Valve
Seat Angle ......................................... 44.25-44.75

Seat Width .............................. .060-.080" (1.5-2.0 mm)\
Maximum Seat Runout .............................. .003" (.08 mm)\
Valve Guides
Intake Valve
Valve Guide I.D.
3.9L & 5.2L ......................... .313-.314" (7.95-7.96 mm)\
5.9L ................................ .374-.375" (9.50-9.53 mm)\
Valve Stem-To-Guide Oil Clearance
Standard .............................. .001-.003" (.02-.08 mm)\
Wear Limit ................................. (1) .017" (.43 mm)
Exhaust Valve
Valve Guide I.D.
3.9L & 5.2L ......................... .313-.314" (7.95-7.98 mm)\
5.9L ................................ .374-.375" (9.50-9.53 mm)\
Valve Stem-To-Guide Oil Clearance
Standard .............................. .001-.003" (.02-.08 mm)\
Wear Limit ................................. ( 1) .017" (.43 mm)
( 1) - Specification applies to method obtained by rocking valve stem
in valve guide.









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CAMSHAFT ( 1)








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Application In. (mm)\
End Play
3.9L & 5.2L .................................. .002-.010 (.05-.25)\
5.9L ...................................... .002-.010 (.05-.25 mm)\
Camshaft Bearing I.D.
3.9L
No. 1 ................................. 2.000-2.001 (50.80-50.82)\
No. 2 ................................. 1.984-1.985 (50.39-50.42)\
No. 3 ................................. 1.953-1.954 (49.61-49.63)\
No. 4 ................................. 1.563-1.564 (39.70-39.73)\
5.2L & 5.9L
No. 1 ................................. 2.000-2.001 (50.80-50.82)\
No. 2 ................................. 1.984-1.985 (50.39-50.42)\
No. 3 ................................. 1.969-1.970 (50.01-50.04)\
No. 4 ................................. 1.953-1.954 (49.61-49.63)\
No. 5 ................................. 1.563-1.564 (39.70-39.73)\
Journal Diameter
3.9L
No. 1 ................................. 1.998-1.999 (50.75-50.77)\
No. 2 ................................. 1.982-1.983 (50.34-50.37)\
No. 3 ................................. 1.951-1.952 (49.56-49.58)\
No. 4 ................................. 1.561-1.562 (39.65-39.67)\
5.2L & 5.9L

during manufacture, some new type valves cannot be reground.
Resurface valve on proper angle specification using valve
grinding machine. Follow manufacturer's instructions for valve
grinding machine. Specifications may indicate a different valve face
angle than seat angle.
Measure valve margin after grinding. Replace valve if not
within specification. Valve stem tip can be refinished using valve
grinding machine.
Valve Lapping
During valve lapping of recent designed valves, be sure to
follow manufacturers recommendations. Surface hardening and materials
used with some valves do not permit lapping. Lapping process will
remove excessive amounts of the hardened surface.
Valve lapping is done to ensure adequate sealing between
valve face and seat. Use either a hand drill or lapping stick with
suction cup attached.
Moisten and attach suction cup to valve. Lubricate valve stem
and guide. Apply a thin coat of fine valve grinding compound between
valve and seat. Rotate lapping tool between the palms or with hand
drill.
Lift valve upward off the seat and change position often.
This is done to prevent grooving of valve seat. Lap valve until a
smooth polished seat is obtained. Thoroughly clean grinding compound
from components. Valve to valve seat concentricity should be checked.
See VALVE SEAT CONCENTRICITY.
CAUTION: Valve guides must be in good condition and free of carbon
deposits prior to valve seat grinding. Some engines contain
an induction hardened valve seat. Excessive material removal
will damage valve seats.
Valve Seat Grinding
Select coarse stone of correct size and angle for seat to be
ground. Ensure stone is true and has a smooth surface. Select correct
size pilot for valve guide dimension. Install pilot in valve guide.
Lightly lubricate pilot shaft. Install stone on pilot. Move stone off
and on the seat approximately 2 times per second during grinding
operation.
Select a fine stone to finish grinding operation. Grinding
stones with 30 and 60 degree angles are used to center and narrow the
valve seat as required. See Fig. 10.
Fig. 10: Adjusting Valve Seat Width - Typical
This Graphic For General Information Only
Valve Seat Replacement
Replacement of valve seat inserts is done by cutting out

Fig. 18: Measuring Connecting Rod Side Clearance - Typical
This Graphic For General Information Only
Check for improper bearing installation, wrong bearing cap
or insufficient bearing clearance if side clearance is insufficient.
Connecting rod may require machining to obtain proper clearance.
Excessive clearance usually indicates excessive wear at crankshaft.
Crankshaft must be repaired or replaced.
MAIN & CONNECTING ROD BEARING CLEARANCE
Plastigage Method
Plastigage method may be used to determine bearing clearance.
Plastigage can be used with an engine in service or during reassembly.
Plastigage material is oil soluble.
Ensure journals and bearings are free of oil or solvent.
Oil or solvent will dissolve material and false reading will be
obtained. Install small piece of Plastigage along full length of
bearing journal. Install bearing cap in original location. Tighten
bolts to specification.
CAUTION: DO NOT rotate crankshaft while Plastigage is installed.
Bearing clearance will not be obtained if crankshaft is
rotated.
Remove bearing cap. Compare Plastigage width with scale on
Plastigage container to determine bearing clearance. See Fig. 19.
Rotate crankshaft 90 degrees. Repeat procedure. this is done to check
journal eccentricity. This procedure can be used to check oil
clearance on both connecting rod and main bearings.