NISSAN ALMERA N15 1995 Service Manual

OILSEAL REPLACEMENT
VALVE OILSEAL

1. Remove accelerator cable.
2. Remove rockercoverandoilseparator.
3. Remove camshafts andsprockets.
Refer to"Removal" in"TIMING CHAIN"(EM-69).
4. Remove sparkplugs.
5. Install airhose adapter intospark plugholeandapply air
pressure tohold valves inplace. Applyapressure of490
kPa (4.9bar, 5kg/cm
2,
71psi).
6. Remove rockerarm,rocker armguide andshim.

Air SEM077D

7.Remove valvespring withTool.

Piston concerned shouldbeset atTOe toprevent valvefrom
falling.

8. Remove valveoilseal.
9. Apply engine oiltonew valve oilseal andinstall itwith Tool.

FRONT OILSEAL

1. Remove thefollowing parts:
• Engine undercover
• Front RHwheel andengine sidecover
• Drive belts
• Crankshaft pulley
2. Remove frontoilseal.

Be careful nottoscratch frontcover.
SEM997C EM-82

Engine
/'i

inside
Y

Oil seal lip
Engine
/'i

inside
Y
OIL
SEAL REPLACEMENT

• Install newoilseal inthe direction shown.

~ Engine
Youtside

SEM715A
3.Apply engine oiltonew oilseal andinstall itusing asuit-
able tool.

REAR OILSEAL

1. Remove transaxle. (RefertoMT orAT section.)
2. Remove flywheel ordrive plate.
3. Remove rearoilseal.

Be careful nottoscratch rearoilseal retainer.
SEM999C
•Install newoilseal inthe direction shown.

~ Engine
Youtside
•

4. Apply engine oiltonew oilseal andinstall itusing asuit-
able tool.

SEM001D EM-S3

..:;:r--
Coupling

Ii!
Grease
Rod

Throttle body

Coupling
LCOUPJing

~ 9

Ii!
Grease ~
When closed 4a'"link

SEM205D

Tr;rn ~Adjusting serew
_ /- Aeeel-drum

"""7'i'i\.

Stopperlever

SEM208D ACCEL-DRUM
UNIT
Adjust accel-drum unitwhenever anyofthe following parts
(new orold) areinstalled:
• Accel-drum unit
• Throttle chamber
• Rod (Always replacewithanew oneafter removal.)

1. Install accel-drum unitand throttle chamber.
2. Apply grease allover theinside ofthe rod couplings .

Use genuine Nissangrease orequivalent.

3. Insert eachonecoupling toball links ofthrottle chamber
and accel-drum unit.
4. Loosen locknut.
5. Loosen adjusting screwenough.
6. Manually turnaccel-drum untilthrottle valveisfully open.
• Check thatstopper leverisnot touching adjusting screw.
If itis, loosen adjusting screwtomaintain clearance
between thetwo.
7. Turn adjusting screwuntil
it
touches stopperlever.
8. Back offaccel-drum.
Turn adjusting screw3
rotations clockwise. Lock
nut 9.
Turn adjusting screw3rotations clockwise.
10. Tighten locknut.

~ 4.0-5.4 N.m
(0.41 -0.55 kg-m, 35.6-47.7 In-rb)
SEM209DA
EM-84

SEC.111.130 CYLINDER
HEAD
~Refer to"Installation" In"riMING CHAIN".

Rocker covergasket ~

20
f) ~
Refer to"Installation" in
"rIMING CHAIN".

~stside
~\9
"'I

Ii ~

~f::l

If;

~ ~

!
l~
\alve oilseal ~

04 ~~

rn, :
Refer to"Installation" in"TIMING CHAIN".

~-J :
N.m (kg-m, ft-Ib)
~ :N.m (kg-m, in-Ib)
~ :Apply liquidgasket.

fJ :
Lubricate withnewengine oil.

SEM722ED
•

G)
Oilfiller cap
@

Camshaft sprocket

@
Rocker cover
@

Camshaft
@ Rocker
armguide
@)

Camshaft
bracket
@ Rocker
arm
@

Oiltube

@)
Shim
@

Water outlet

@
Hydraulic
lashadjuster
@

Cylinder head

(J)
Chain.
tensioner
@

Valve

EM-8S @

Valve spring seat

@
Valve spring

@
Valve spring retainer

@
Valve collet

@
Spark plug

@>
Cylinder headbolt

Rocker~armguide-
Rocker arm

Shim

Hydraulic I
o,h .dJ""~
i
!\
'!
OK
~

@
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)
•

r
I

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