1995 NISSAN ALMERA N15 Service Manual

Rocker~armguide-
Rocker arm

Shim

Hydraulic I
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SEM878CA
SEM202D CYLINDER
HEAD
CAUTION:
• Apply newengine oiltothe sliding surfaces wheninstalling
sliding parts.Sliding partsinclude rockerarms,camshafts,
oil seal, etc.
• Apply newengine oiltobolt thread andseat surfaces when
tightening thefollowing: Cylinderheadbolts, camshaft
sprocket boltsandcamshaft bracketbolts.
• Ifa hydraulic lashadjuster iskept onitsside, there isarisk
of air entering it.After removal, alwayssethydraulic lash
adjuster straightup,orkeep itsoaked innew engine oil.
• .Do not disassemble hydrauliclashadjusters.
• Attach tagstolash adjusters soasnot tomix them up.
Removal

• This removal procedure isthe same asfor timing chain.
Refer toEM-69.

Disassembly
1. Remove rockerarms,shims, rockerarmguides andhydrau-
lic lash adjusters fromcylinder head.

CAUTION: Keep partsinorder sothat they canbeinstalled intheir origi-
nal positions duringassembly.

2. Remove crankcase ventilation oilseparator.
3. Remove exhaustmanifold cover.
4. Remove exhaustmanifold.
5. Remove wateroutlet.

EM-86

CYLINDERHEAD
Disassembly (Cont'd)

6. Remove intakemanifold supports.
7. Remove fueltube assembly.
Refer to"Injector Removal andInstallation" inEC section.
8. Remove intakemanifold.
•

Intake manifold
collector Looseninnumerical order.

SEM607E

- Thermostat housing

SEM785E
9.
Remove intakemanifold collectorfromintake manifold.
10. Remove thermostat housingwithwater pipe.
11. Remove valvecomponents withTool.

EM-87

SEM925CCYLINDER
HEAD
Disassembly (Cont'd)

12. Remove valveoilseal with asuitable tool.

Inspection
CYLINDER HEADDISTORTION
. Head surface flatness:
Standard Less than0.03mm(0.0012 in)
Limit
0.1 mm (0.004 in)

If beyond thespecified limit,replace orresurface.

Resurfacing limit:
The resurfacing limitofcylinder headisdetermined bythe cyl-
inder block resurfacing inan engine.
Amount ofcylinder headresurfacing is
"A".

Amount ofcylinder blockresurfacing is
"B".

The maximum limitisas follows:

A
+
B
=
0.2 mm (0.008 in)

After resurfacing cylinderhead,check thatcamshaft rotates
freely byhand. Ifresistance isfelt, cylinder headmustbe
replaced.

Nominal cylinderheadheight:
136.9 -137.1 mm(5.390 -5.398 in)
CAMSHAFT VISUALCHECK

Check camshaft forscratches, seizureandwear.

CAMSHAFT RUNOUT

1. Measure camshaft runoutatthe center journal.

Runout (Totalindicator reading):
Standard Less than0.02mm(0.0008 in)
Limit
0.1 mm (0.004 in)

2. Ifitexceeds thelimit, replace camshaft.

EM-88

SEM929CCYLINDER
HEAD ~
Inspection (Cont'd)
CAMSHAFT CAMHEIGHT

1. Measure camshaft camheight.

Standard camheight:
Intake 38.408 -38.598 mm(1.5121 .1.5196 in)
Exhaust 37.920 •38.110 mm(1.4929. 1.5004in)
Cam wear limit:
Intake
&
Exhaust
0.2 mm (0.008 in)

2. Ifwear isbeyond thelimit, replace camshaft.

CAMSHAFT JOURNALCLEARANCE

1. Install camshaft bracketandtighten boltstothe specified
torque.
2. Measure innerdiameter ofcamshaft bearing.

Standard innerdiameter:
28.000 -28.021 mm(1.1024 -1.1032 in)

Measure outerdiameter ofcamshaft journal.

Standard outerdiameter:
27.935 .27.955 mm(1.0998 -1.1006 in)

If clearance exceedsthelimit, replace camshaft and/orcyl-
inder head.

Camshaft journalclearance:
Standard 0.045 -0.086 mm(0.0018 .0.0034 in)
Limit 0.15 mm(0.0059 in)
CAMSHAFT ENDPLAY

1. Install camshaft incylinder head.
2. Measure camshaft endplay.

Camshaft endplay:
Standard 0.055. 0.139mm(0.0022 -0.0055 in)
Limit 0.20 mm(0.0079 in)
CAMSHAFT SPROCKETRUNOUT

1. Install sprocket oncamshaft.
2. Measure camshaft sprocketrunout.

Runout (Totalindicator reading):
Limit 0.25mm(0.0098 in)

3. Ifitexceeds thelimit, replace camshaft sprocket.

EM-89
•

SEM938CCYLINDER
HEAD [][]
Inspection (Cont'd)
VALVE GUIDECLEARANCE

1. Measure valvedeflection inaparallel direction withrocker
arm. (Valve andvalve guide mostly wearinthis direction.)

Valve deflection limit(Dial gauge reading):
Intake
&
Exhaust
0.2 mm (0.008 in)

2. Ifitexceeds thelimit, check valvetovalve guide clearance.
a. Measure valvestemdiameter andvalve guide innerdiam-
eter.
b. Check thatclearance iswithin specification.

Valve tovalve guide clearance:
Standard Intake 0.020-0.053 mm(0.0008 -0.0021 in)
Exhaust 0.040-0.073 mm(0.0016 -0.0029 in)
Limit Intake 0.08mm(0.0031 in)
Exhaust 0.1mm (0.004 in)

c. Ifitexceeds thelimit, replace valveorvalve guide.

VALVE GUIDEREPLACEMENT

1. Toremove valveguide, heatcylinder headto110 to130°C

(230
to
266°F).

2. Press outvalve guide oruse ahammer andsuitable tool.

EM-gO

SEM083DCYLINDER
HEAD
Inspection (Cont'd)

3. Ream cylinder headvalve guide hole.

Valve guide holediameter
(for service parts):
Intake
&
Exhaust
10.175 -10.196 mm(0.4006 -0.4014 in)

4. Heat cylinder headto110 to130°C (230to266°F) andpress
service valveguide ontocylinder head.

Projection
"L":

14.0 -14.2 mm(0.551 -0.559 in)
•

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Recess
I
diameter

I

SEM795A
5.
Ream valveguide.

Valve guide innerdiameter:
Intake
&
Exhaust
6.000 -6.018 mm(0.2362 -0.2369 in)
VALVE SEATS

Check valveseatsforany evidence ofpitting atvalve contact
surface. Resetorreplace ifithas worn outexcessively.

• 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 outoldseat until
it
collapses. Boringshould notcon-
tinue beyond thebottom faceofthe seat recess incylinder
head. Setthemachine depthstoptoensure this.
2. Ream cylinder headrecess.

Reaming boreforservice valveseat
Oversize [0.5mm (0.020 in)]:
Intake 35.500-35.516 mm(1.3976 -1.3983 in)
Exhaust 31.500.31.516 mm(1.2402 -1.2408 in)
Be sure toream incircles concentric tothe valve guide center.
This willenable valveseattofit correctly.
EM-91

T(Margin thickness)

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SEM892B
SEM188A CYLINDER
HEAD
Inspection (Cont'd)

3. Heat cylinder headto110 to130°C (230to266°F).
4. Press fitvalve seatuntil itseats onthe bottom.
5. Cut orgrind valve seatusing asuitable toolatthe specified
dimensions asshown inSDS (EM-165).
6. After cutting, lapvalve seatwithabrasive compound.
7. Check valveseating condition.

Seat faceangle
"u":

44°53' -45°07'
Contacting width
"W":

Intake 1.05 -1.35 mm(0.0413 -0.0531 in)
Exhaust
1.25 -1.55 mm(0.0492 -0.0610 in)
VALVE DIMENSIONS

Check dimensions ineach valve. Fordimensions, refertoSDS
(EM-164).
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 than2.2mm (0.087 in)

2. Ifitexceeds thelimit, replace spring.

EM113 Pressure

Check valvespring pressure.

Pressure: N(kg, Ib)atheight mm(in)
Standard
578.02 -641.57 (58.94-65.42,
129.96 -144.25) at30.0 (1.181)
Limit
More than549.2 (56.0, 123.5) at30.0 (1.181)

If itexceeds thelimit, replace spring.

EM-92

•
SEM935C

Rocker arm

SEM694D CYLINDER
HEAD
Inspection (Cont'd)
HYDRAULIC LASHADJUSTER

1. Check contact andsliding surfaces forwear orscratches .
2. Check diameter oflash adjuster.

Outer diameter:
16.980 -16.993 mm(0.6685 -0.6690 in)

3. Check lashadjuster guideinnerdiameter.

Inner diameter:
17.000 -17.020 mm(0.6693 -0.6701 in)
Standard clearance betweenlashadjuster and
adjuster guide:
0.007 -0.040 mm(0.0003 -0.0016 in)
ROCKER ARM,SHIMANDROCKER ARMGUIDE

Check contact andsliding surfaces ofrocker arms,shims and
rocker armguides forwear orscratches.

Assembly
1. Install intakemanifold collector tointake manifold.
•

Intake manifold
collector Tighteninnumerical order.

SEM609E
EM-93