1995 NISSAN ALMERA N15 Service Manual

I

Recess
1
diameter

I

SEM795A CYLINDER
HEAD
Inspection (Cont'd)
VALVE SEATS

Check valveseats forpitting atcontact surface. Resurface or
replace ifexcessively worn.

• Before repairing valveseats, checkvalveandvalve guide
for wear. Ifthey have worn, replace them.Thencorrect
valve seat.
• Cut with both hands touniform thecutting surface.
REPLACING VALVESEATFORSERVICE PARTS

1. Bore outold seat until
it
collapses. Setmachine depthstop
so that boring cannot contact bottomfaceofseat recess in
cylinder head.
2. Ream cylinder headrecess.

Reaming boreforservice valveseat
Oversize [0.5mm(0.020 in)]:
Unit:mm(in)
Engine model GA16DE
withoutVTC,
GA16DE withVTC
14DE and15DE
30.500 -30.516
Intake (1.2008
-1.2014)
31.500-31.516
31.500 -31.516
(1.2402-1.2408)
(1.2402 -1.2408).
Exhaust 25.500
-25.516
26.500-26.516
(1.0039 -1.0046)
(1.0433-1.0439)
.: GA 16DE without VTC
Use thevalve guide center forreaming toensure valveseatwill
have thecorrect fit.
EM-38

T(Margin thickness)

--1,-

ml
a

III' ~

o

~-
-L
d
SEM8928

I
.\

SEM188A
CYLINDER
HEAD

Inspection (Conl'd)

3. Heat cylinder headto110 to120°C (230to248°F).
4. Press fitvalve seatuntilitseats onthe bottom .
5. Cut orgrind valve seatusing suitable toolatthe specified
dimensions asshown inSOS (EM-159).
6. After cutting, lapvalve seatwithabrasive compound.
7. Check valveseating condition.
Seat faceangle "a":
45°15' -45°45' deg.
Contacting width"W":
Intake
1.06 -1.34 mm(0.0417 -0.0528 in)
Exhaust
1.20 -1.68 mm(0.0472 -0.0661 in)

VALVE DIMENSIONS

Check dimensions ineach valve. Fordimensions, refertoSOS
(EM-156).
When valveheadhasbeen worn down to0.5 mm (0.020 in)in
margin thickness, replacevalve.
Grinding allowance forvalve stemtipis0.2 mm (0.008 in)or
less.
•

SEM288A VALVE
SPRING

Squareness
1. Measure "S"dimension.
Out-of-square: Less than1.80mm(0.0709 in)
2. Ifitexceeds thelimit, replace spring.

EM113
Pressure

Check valvespring pressure.
Pressure: N(kg, Ib)atheight mm(in)
Standard 344.42 (35.12, 77.44)at25.26 (0.9945)
Limit More than323.73 (33.01, 72.79)at25.26 (0.9945)
If itexceeds thelimit, replace spring.

EM-39

SEM160DCYLINDER
HEAD

Inspection (Cont'd)

VALVE LIFTER ANDVALVE SHIM

1. Check contact andsliding surfaces forwear orscratches.

SEM161D
SEM162D
2.
Check diameter ofvalve lifterandvalve lifterguide bore.

Valve lifterdiameter:
29.960 •29.975 mm(1.1795 •1.1801 in)
Lifter guide borediameter:
30.000 -30.021 mm(1.1811 .1.1819 in)
Clearance betweenvalvelifterandvalve lifterguide
0.025 -0.061 mm(0.0010 -0.0024 in)

If
it
exceeds thelimit, replace valvelifterorcylinder head
which exceeds thestandard diameter tolerance.

o

Cylinder headside Wide
pitch
Narrow pitch
SEM638B
Assembly

1. Install valvecomponent parts.

• Always usenew valve oilseal. Refer toOIL SEAL
REPLACEMENT (EM-30).
• Before installing valveoilseal, install valvespring seat.
• After installing valvecomponents, tapvalve stemtipwith a
plastic hammer toassure aproper fit.
• Install uneven pitchtypespring withitsnarrow pitchend
toward cylinder head.(Identification colorsidedown, if
present.)

Installation

• This installation isthe same procedure asthose fortiming
chain. Referto"Installation" in"TIMING CHAIN"(EM-23).

EM-40

VALVECLEARANCE
1 1 22
2 2 44
SEM140D Checking
Check valveclearance whileengine iswarm andnotrunning.

1. Remove rockercover.
2. Remove allspark plugs.
3. Set
NO.1
cylinder atTOC onitscompression stroke.
• Align pointer withTOC mark oncrankshaft pulley.
• Check thatvalve lifters on
NO.1
cylinder areloose andvalve
lifters on
NO.4
aretight.
If not, turn crankshaft onerevolution (360°)andalign as
above.
4. Check onlythose valves showninthe figure.
• Using afeeler gauge, measure clearance betweenvalve
lifter andcamshaft.
• Record anyvalve clearance measurements whichareoutof
specification. Theywillbeused latertodetermine the
required replacement adjustingshim.

Valve clearance forchecking (Hot):
Intake 0.21 -0.49 mm(0.008 .0.019 in)
Exhaust 0.30. 0.58mm(0.012 -0.023 in)

5. Turn crankshaft onerevolution (360°)andalign markon
crankshaft pulleywithpointer.
6. Check thosevalves shown inthe figure.
• Use thesame procedure asmentioned instep 4.
7. Ifall valve clearances arewithin specification, installthe
following parts.
• Rocker cover
• Allspark plugs
•

"-

Tool (A}KV10115110

,

SEM141DAdjusting
Adjust valveclearance whileengine iscold.

1. Turn crankshaft, toposition camlobeoncamshaft ofvalve
that must beadjusted upward.
2. Place Tool(A)around camshaft asshown infigure.

Before placing Tool(A),rotate notchtoward centerofcylinder
head (Seefigure.), tosimplify shimremoval later.
CAUTION: Be careful nottodamage camsurface withTool (A).
EM-41

SEM145D
VALVE
CLEARANCE
[QKJ
Adjusting (Cont'd)

3. Rotate Tool(A)(See figure.) sothat valve lifterispushed
down.
4. Place Tool(8)between camshaft andvalve liftertoretain
valve lifter.

CAUTION:

• 'Tool (B)must beplaced asclose tocamshaft bracketas
possible.
• Becareful nottodamage camsurface with'Tool (B).
5. Remove Tool(A).
6. Remove adjusting shimusing asmall screwdriver anda
magnetic finger.
7. Determine replacement adjustingshimsizefollowing for-
mula.
• Using amicrometer determinethicknessofremoved shim.
• Calculate thicknessofnew adjusting shimsovalve clear-
ance comes within
specified
values.
R
=
Thickness ofremoved shim
N
=
Thickness ofnew shim
M
=
Measured valveclearance
Intake:
N
=
R
+
[M -0.37 mm(0.0146 in)]
Exhaust:
N
=
R
+
[M -0.40 mm(0.0157 in)]
Shims areavailable in50 sizes from2.00mm(0.0787 in)to2.98
mm (0.1173 in),insteps of0.02 mm(0.0008 in).
• Select newshim withthickness asclose aspossible tocal-
culated value.

Shim Type A
Indicate
T
=
2.68
mm
(0.1055 In)
Type B
SEM104FEM-42

VALVECLEARANCE
[]K]

Adjusting (Cont'd)

8. Install newshim using asuitable tool.

• Install withthesurface onwhich thethickness isstamped
facing down.

9. Place Tool(A)asmentioned insteps 2and 3.
10. Remove Tool(B).
11. Remove Tool(A).
12. Recheck valveclearance.

Valve clearance:
Unit:mm(in)
For adjusting Forchecking
Cold'
Hot (referencedata) Hot
Intake 0.32
-0.40 0.25
-0.33
0.21-0.49
(0.013 -0.016)
(0.010-0.013) (0.008-0.019)
Exhaust 0.37
-0.45 0.32-0.40 0.30-0.58
(0.015 -0.018) (0.013-0.016) (0.012-0.023)
': At atemperature ofapproximately 20"C(68"F)
Whenever valveclearance areadjusted tocold specifications, checkthatthe
clearances satisfyhotspecifications andadjust againifnecessary.
EM-43
•

ENGINEREMOVAL
SEM237F
5

to.J :
N'm (kg-m, ft-Ib)

* :Located atfront cover.

to.J

44•54 (4.5 •5.5, 33•40)

MIT models
~44.54
(4.5 .5.5, 33.40)

~ I
)-<~
to.J
44-54

o
(4.5-5.5,

10
~;:J
33•40)

('.~

V~)
/$1

'v1( ./'"
L
[OJ
44•54

" / (4.5•5.5,

33 -40)
9

ffit"J

44-54 (4.5 -5.5. 33-40)

d
GA15DE andGA16DE withVTe
except forAustralia

u~

SEC.
112

@(For Europe)

(1)
Engine frontmounting

@
Cylinder headfrontmounting
bracket

@
Engine frontmounting bracket

@
Engine rearmounting bracket
@

Transaxle mounting

@
Transaxle mountingbracket

(f)
Engine rearmounting

@
Dynamic damper(AfTmodels)
@

Center member

@J
Buffer rodbracket

@
Buffer rod

EM-44

ENGINEREMOVAL

WARNING:
a. Situate vehicle onaflat and solid surface.
b. Place chocks atfront andback ofrear wheels.
c. Donot remove engineuntilexhaust systemhascompletely
cooled off.
Otherwise, youmay burn yourself and/orfiremay break out
in fuel line.
d. For safety during subsequent steps,thetension ofwires
should beslackened againsttheengine.
e. Before disconnecting fuelhose, release fuelpressure from
fuel line.
Refer to"Releasing FuelPressure" inEC section.
f. Besure tohoist engine andtransaxle inasafe manner.
g. For engines notequipped withengine slingers, attach
proper slingers andbolts described inPARTS CATALOG.
CAUTION:
• When liftingengine, besure toclear surrounding parts.
Take special careforaccelerator wirecasing, brakelines
and brake master cylinder.
• Inhoisting theengine, alwaysuseengine slingers inasafe
manner.
• Inremoving driveshaft, becareful nottodamage grease
seal oftransaxle.
Engine cannotberemoved separately fromtransaxle. Remove
engine withtransaxle.

Removal

1. Drain water.
2. Remove hood.
3. Remove battery.
4. Remove reservoir tankandbracket.
5. Remove drivebelts.
6. Remove alternator, compressor andpower steering oil
pump fromengine.

Power steering pumpdoesnotneed tobe disconnected from
power steering tubes.

7. Remove thefollowing parts:
• Right andleftfront tires
• Under covers
• Splash covers
• Brake caliper assembly

~: 72-97 N'm (7.3•9.9 kg-m, 53•72 ft-Ib)
Brake hosedoes notneed tobe disconnected frombrake cali-
per assembly.
Never depress brakepedal.

• Disconnect tie-rodballjoint (RH
&
LH).

~: 29-39 N'm (3.0-4.0 kg-m, 22-29 ft-Ib)

• RH
&
LH drive shaft

When removing driveshaft, becareful nottodamage transaxle
side grease seal.

EM-45
•