Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan 300ZX 1984-1985,1988,1990,1994-1996 Approved 1988 Engine
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I
ENGINE MECHANICAL
SECTION EM V
CONTENTS
PREPARATION ............................................................ EM- 2
r IVG30E 1 I
ENGINE COMPONENTS .Outer Parts ....................................... EM- 5
CHECKING COMPRESSION PRESSURE ...................................... EM- 7
TIMING BELT ........................................................... EM- 8
TIMING BELT . Removal ................................................. EM- 9
TIMING BELT . Inspection ................................................ EM-10
TIMING BELT .Installation ............................................... EM-11
CYLINDER HEAD ........................................................ EM-14
CYLINDER HEAD .Removal .............................................. EM-15
CYLINDER HEAD .Disassembly ........................................... EM-17
CYLINDER HEAD . Inspection ............................................ EM-17
CYLINDER HEAD . Assembly ............................................. EM-24
CYLINDER HEAD . Installation ............................................ EM-25
OIL PAN ................................................................ EM-28
OIL SEAL REPLACEMENT ................................................ EM-31
ENGINE REMOVAL ...................................................... EM-33
ENGINE OVERHAUL ..................................................... EM-35
ENGINE OVERHAUL . Disassembly ........................................ EM-36
ENGINE OVERHAUL .Inspection .......................................... EM-%
ENGINE OVERHAUL .Assembly .......................................... EM43
SERVICE DATA AND SPECIFICATIONS (S.D.S.) .............................. EM47
PREPARATION
SPECIAL SERVICE TOOLS
Tool number
(Kent-Moore No.) Description
Tool name
ST0501SOOO Disassembling and assembling
( - 1
Engine stand
assembly
@ ST05011000
( - )
Engine stand
@ST05012000
( - 1
Base
KV10106500
( - 1
Engine stand shaft
KV10110001
( - 1
Engine sub-
attachment
ST 10120000 Loosening and tightening
(52423901) cylinder head bolt
Cylinder head bolt
wrench
KVlO110600 Disassembling and assembling
(J339861 valve components
Valve spring
compressor
KV10107501
( - 1
Valve oil seal drift
EM-2
PREPARATION
Tool number
(Kent-Moore No.) Description
Tool name
KVlOllO300 Disassembling and assembling
( - 1 piston with connecting rod
Piston pin press stand
assembly
@KV10110310
( - )
QP
@ KV10110330
I - )
Spacer
@ ST1 3030020
( - )
Press stand
@ ST13030030
( - )
Spring
@ KVlOllO340
( - )
Drift
@ KV10110320
( - )
Center shaft
EM03470000 Installing piston assembly into
(580371 cylinder bore
Piston ring compressor
ST 16610001 Removing crankshaft
(523907) pilot bushing
Pilot bushing puller
KV 101 1 1 100 Removing oil pan
( - 1
Seal cutter
WS39930000 Pressing the tube of liquid
( - ) gasket
Tube presrer
Spark plug wrench Removing and
installing spark plug
l6mm
(063 ml
EM-3
PREPARATION
Tool name Description
Pulley holder Holding camshaft
. -. brJ pulley while tightening
or loosening camshaft
bolt
Valve seat cutter set Finishing valve seat
dimensions
Piston ring expander Removing and
installing piston ring
Valve guide drift Intake & Exhaust: Removing and
A = 10.5 m m installing valve guide
(0.413 id din.
B = 6.6 m m
10.260 in1 dia.
Valve guide reamer Intake: Reaming valve guide
D, = 7.0 mm 10.276 in1 dia.
D. = 11.2 mrn (0.441 in1 dis.
(0) for
or hole
-
Exhain:
D, 8.0 m m 10.315 in1 dia.
D, = 12.2 m m 10.480 in1 dia.
oversize valve guide
(0)
0%
EM-4
ENGINE COMPONENTS - Outer Parts
..
c
SEM8050
EM-5
ENGINE COMPONENTS - Outer Parts
SEMESOB
EM-6
CHECKING COMPRESSION PRESSURE
Wrench with a rnagnst
Measurement of Compression Pressure
to hold spark plug 1. Warm up engine.
2. Turn ignition switch off.
3. Removal all spark plugs.
4. Disconnect distributor center cable.
10.63 in1 5. Release fuel pressure.
Refer to "Release Fuel Pressure" in section EF & EC
SEM294d
6. Attach a compression tester to No. 1 cylinder.
I I 7. Depress accelerator pedal fully to keep throttle valve wide
open.
8. Crank the engine and read the highest gauge indication.
a Always use a fully-charged battery to obtain specified
engine revolution.
Compression pressure:
kPa (kglcm', psi)/rpm
Standard
Non-turbo
1,196 (12.2, 173)/300
Turbo
1,167 (11.9, 169)/300
Minimum
Non-turbo
883 (9.0, 128)/300
Turbo
863 (8.8, 125)/300
Difference limit between cylinders:
98 (1.0. 14)/300
9. Repeat the measurement on each cylinder as shown above.
10. If cylinder compression in one or more cylinders is low, pour
a small amount of engine oil into cylinders through the spark
plug holes and retest compression.
a If adding oil helps the compression, piston rings may be
worn or damaged. If so, replace the piston rings after
checking piston.
a If pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat. (Refer
to S.D.S.). If the valve or valve seat is damaged exces-
sively, replace them.
a If compression in any two adjacent cylinders is low and if
adding oil does not help the compression, there i s leak-
age past the gasket surface. If so, replace cylinder head
gasket.
EM-7
TIMING BELT
E
t
E
E
i
SEM238A
EM-8
TIMING BELT
Removal
1. Remove engine under cover.
2. Drain engine coolant from radiator.
Be careful not to spill coolant on drive belts.
3. Remove radiator shroud and fan.
4. Remove the following belts.
0 Power steering drive belt
0 Compressor drive belt
Alternator drive belt
5. Remove suction pipe bracket of coolant and lower hose
from suction pipe.
6. Remove all spark plugs.
Timina indicator I 7. Set No. 1 cylinder at T.D.C. on its compression stroke.
8. Remove idler bracket of the compressor drive belt and
crankshaft pulley.
9. Remove front upper and lower belt covers.
Crankshaft pulley
I timing mark I
No. 1 cylinder a t T.O.C. I
Distributor rotor position
SEM530A
10. Loosen timing belt tensioner nut, turn tensioner, and then
remove timing belt.
SEMZ40A
EM-9
TIMING BELT
Inspection
Visually check the condition of the timing belt.
Replace if any abnormality is found.
Item to check Problem Cause
Tooth is broken/ Camshaft iamming
tooth root is Distributor jamming
cracked.
a Damaged camshaftlcrankshaft oil seal
SEM3941
Back surface is a Tensioner jamming
crackedhorn. a Overheated engine
a Interference with belt cover
SEM395
Side surface i s worn. a Improper installation of belt
a Malfunctioning crankshaft pulley p l a t e l
timing belt plate
a Belt corners are worn and round.
a Wicks are frayed and coming out. ~ ~ ~ 3 9 6
Teeth are worn. a Poor belt cover sealing
a Coolant leakage at water pump
a Camshaft not functioning properly
a Distributor not functioning properly
a Excessive belt tension
c c
Rotating direction
a Canvas on tooth face is worn down.
a Canvas on tooth is fluffy, rubber layer is
worn down and faded white, or weft is
worn down and invisible. SEM397
OilICoolant or water is a Poor oil sealing of each oil seal
stuck to belt. a Coolant leakage a t water pump
a Poor belt cover sealing
EM-1 0
TIMING BELT
Inspection (Cont'd)
BELT TENSIONER AND TENSIONER SPRING
1. Check belt tensioner for smooth turning.
2. Check condition of tensioner spring.
Installation
1. Confirm that No. 1 cylinder is set at T.D.C. on its compres-
sion stroke.
Crankshah timi Pump in compre%ioi
2. Install tensioner and tensioner spring.
Hook mntionar rpri If stud is once removed, apply locking sealant to threads of
stud before installing.
L"=+I Arrow A
SEM243P
3. Swing tensioner fully clockwise with hexagon wrench, and
temporarily tighten lock nut.
Aligning Aliening 1
Number of timing belt teeth 133
Number of Between L.H. and R.H. camshaft sprockets 40
Crankshah timinp teeth between Between L.H. camshaft sprocket and
sorocket No. 1 cylinder at T.D.C. 43
SEM242A in compraion Wok0 I timina marks crankshaft timing surocket
EM-I 1
TIMING BELT
Installation (Cont'd)
5. Loosen tensioner lock nut, keeping tensioner steady with a
hexagon wrench.
6. Turn tensioner 70 to 80 degrees clockwise with hexagon
wrench, and temporarily tighten lock nut.
7. Turn crankshaft clockwise 2 or 3 times, then slowly set No.
1 cylinder at T.D.C. on its compression stroke.
8. Push middle of timing belt between R.H. camshaft sprocket
and tensioner pulley with a force of 98 N (10 kg, 22 Ib).
9. Loosen tensioner lock nut, keeping tensioner steady with a
hexagon wrench.
Cranbhaftl
sprocket s ~ ~ e e n
10. Set thickness gauge as shown in the ..jure which is 0.35
mm (0.0138 in) thick and 12.7 mm (0.500 in) wide.
Timing balt
~nrionsr
Width: 12.7 mm
~ o . ~ i n l I
N.G. N.G. OK. 11, Turn crankshaft clockwise, and set thickness gauge as
Thickness, shown in the figure.
0 Timing belt will move about 2.5 teeth.
12. Tighten tensioner lock nut, keeping tensioner steady with a
hexagon wrench.
Tenaionar pulley
bslt
Crankshaft
sprocket
/
I
smeem
EM-I2
TIMING BELT
Installation (Cont'd)
13. Turn crankshaft clockwise or counterclockwise, and remove
thickness gauge.
14. Turn crankshaft clockwise 2 or 3 times, then slowly Set NO.
1 cylinder at T.D.C. on its compression stroke.
15. Install lower and upper belt covers.
Belt mver front luppsr)
, ,BokA17ps.l
E M - I3
CYLINDER HEAD
4
- Exhaust
R.H. cylinder L.H. cylinder
head front head front
raw
(ol 1 3 10.1 - 0 3 0.7. 2.21-
..
Intake
: N m Ikgm,ft-lbl
SEMSlZB
EM-I4
CYLINDER HEAD
CAUTION:
0 When installing sliding parts such as rocker arms, cam-
shafl and oll seal, be sure to apply new engine oil on their
sliding surfaces.
0 When tightening cylinder head bolts and rocker shaft bolts,
apply new engine oil to the thread portions and seat
surfaces of bolts.
I. O.K. 0 If a hydraulic valve lifter is kept on Its side, there is a risk
of air entering It. After removal, always set hydraulic valve
lifter straight up, or when laying It on its side, have it soak
in new engine oil.
0 Do not disassemble hydraulic valve lifter.
0 Attach tags to valve lifters so as not to mix them up.
N.G.
EM8701
Removal
1. Remove timing belt.
Refer to "Removal" of TIMING BELT.
2. Drain coolant by removing drain plug on left side of cylinder
block.
3. Remove collector cover and collector.
Before removing collector, be sure to drain coolant removing
drain plug in cylinder block.
4. Remove intake manifold with fuel tube assembly.
0 Loosen intake manifold bolts in numerical order.
EM-I5
CYLINDER HEAD
Removal (Cont'd)
5. Remove power steering pump bracket.
6. Remove exhaust collector bracket
SEM297A
7. Disconnect exhaust manifold balance tube.
8. Disconnect exhaust tube from exhaust manifold.
9. Remove camshaft sprockets and rear timing belt cover.
SEM298A
1 Remove compressor and its bracket.
SEM435B
rFar L.H. cylinder head For R.H. cylindey hem 11. Remove rocker covers.
12. Remove cylinder head with exhaust manifold.
0 Head warpage or cracking could result from removing In
incorrect order.
0 Cylinder head bolts should be loosened in two or three
steps.
~ o o r s n numerical orde
in
SEM926I
EM-1 6
CYLINDER HEAD
R.H. exhaust manifold Disassembly
No.5 No.3 No. 1
1. Remove exhaust manifolds from cylinder head
2. Remove rocker shafts with rocker arms.
Bolts should be loosened in two or three steps.
3. Remove hydraulic valve lifters and lifter guide.
0 Hold hydraulic valve lifters with wire so that they will not
drop from lifter guide.
4. Remove oil seal and camshaft.
5. Remove valve components with Tool.
Tool: KV10110600 (J33986)
6. Remove valve oil seals.
iEM259A
Inspection
CYLINDER HEAD DISTORTION
Head surface flatness:
Less than 0.1 mm (0.004 in)
If beyond the specified limit, replace it o resurface it.
r
Resurfacing limit:
The resurfacing limit of cylinder head is determlned by the
cylinder block resurfacing in an engine.
Amount of cylinder head resurfacing is " A '
Amount of cylinder block resurfacing is "B"
The maximum limlt is as follows:
A + B = 0.2 mm (0.008 In)
After resurfacing the cylinder head, check that camshaft rotates
freely by hand. If resistance is felt, the cylinder head must be
replaced.
Nominal cylinder head height:
- -
106.8 107.2 mm (4.205 4.220 in)
EM-I 7
CYLINDER HEAD
Inspection (Cont'd)
VALVE GUIDE CLEARANCE
1. Measure valve deflection in a parallel direction with rocker
arm. (Valve and valve guide mostly wear in this direction.)
Valve deflection limit (Dial gauge reading):
0.20 mm (0.0079 in)
2. If it exceeds the limit, check valve to valve guide clearance.
(1) Measure valve stem diameter "d" and valve guide inner
diameter.
(2) Check that clearance is within the specification.
Valve to valve guide clearance limit:
0.10 mm (0.0039 in)
(3) If it exceeds the limit, replace valve or valve guide.
SEMBOO
1
Valve guide
Valve
I,.
Center
SEM751
VALVE GUIDE REPLACEMENT
1. To remove valve guide, heat cylinder head to 150 to 16OOC
(302 to 32OOF).
L SEM008A
r I 2. Drive out valve guide with a press [under a 20 kN (2 1 2.2
,
US ton, 2.0 Imp ton) pressure] or hammer and suitable tool.
SEM264A
EM-I8
CYLINDER HEAD
Inspection (Cont`d)
3. Ream cylinder head valve guide hole.
Valve guide hole diameter
(for service parts):
Intake:
-
11.175 11.196 mm (0.4400 - 0.4408 in)
Exhaust:
-
12.175 12.196 mm (0.4793 - 0.4802 In)
4 Heat cylinder head to 150 to 160◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo