spark plugs TOYOTA LAND CRUISER 1996 J80 Workshop Manual

EM0KR−04
−
ENGINE MECHANICAL COMPRESSION
EM−3
506
Author: Date:
1996 LAND CRUISER (RM451U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. DISCONNECT DISTRIBUTOR CONNECTOR
3. REMOVE SPARK PLUGS (See page IG−1 )
4. CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression pressure.
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d) Repeat steps (a) through (c) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible. Compression pressure:
1,176 kPa (12.0 kgf/cm
2, 171 psi) or more
Minimum pressure: 883 kPa (9.0 kgf/cm
2, 128 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
If the cylinder compression in one or more cylinders is low, pour
a small amount of engine oil into the cylinder through the spark
plug hole and repeat steps (a) through (c) for cylinders with low
compression.
If adding oil helps the compression, it is likely that
the piston rings and/or cylinder bore are worn or
damaged.
If pressure stays low, a valve may be sticking or
seating is improper, or there may be leakage past
the gasket.
5. REINSTALL SPARK PLUGS (See page IG−1 )
6. RECONNECT DISTRIBUTOR CONNECTOR
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

EM1Q4−01
P05120A16078
1 Dot Mark
EM−4
−
ENGINE MECHANICAL VALVE CLEARANCE
507
Author: Date:
1996 LAND CRUISER (RM451U)
VALVE CLEARANCE
INSPECTION
HINT:
Inspect and adjust the valve clearance when the engine is cold.
1. DRAIN ENGINE COOLANT
2. REMOVE THROTTLE BODY (See page SF−45)
3. DISCONNECT ENGINE WIRE AND HEATER VALVE FROM COWL PANEL
(a) Remove the 2 bolts and disc onnect the ground strap and
engine wire.
(b) Remove the 2 bolts and disconnect the heater valve.
4. DISCONNECT HIGH −TENSION CORDS FROM SPARK
PLUGS (See page IG−1 )
5. REMOVE CYLINDER HEAD COVER
Remove the 13 bolts, cylinder head cover and gasket.
6. SET NO. 1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with the timing mark ”0” of the timing chain cover.
(b) Check that the timing marks (1 and 2 dots) of the camshaft
drive and driven gears are in straight line on the cylinder
head surface as shown in the illustration.If not, turn the
crankshaft 1 revolution (360 °) and align the marks as
above.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

EM0494
−
ENGINE MECHANICAL VALVE CLEARANCE
EM−7
510
Author: Date:
1996 LAND CRUISER (RM451U)
9. Rear valves of No. 6 cylinder
ADJUST VALVE CLEARANCE
(a) Remove the distributor (See page IG−10).
(b) Remove the camshafts (See page EM−28).
(c) Remove the adjusting shim with a small screwdriver.
(d) Determine the replacement adjusting shim size by follow- ing the Formula or Charts:
Using a micrometer, measure the thickness of the
removed shim.
Calculate the thickness of a new shim so that the
valve clearance comes within specified value.
T ....... Thickness of removed shim
A ....... Measured valve clearance
N ....... Thickness of new shim
Intake: N = T + (A − 0.20 mm (0.008 in.))
Exhaust: N = T + (A − 0.30 mm (0.012 in.))
Select a new shim with a thickness as close as pos-
sible to the calculated value.
HINT:
Shims are available in 17 sized in increments of 0.05 mm
(0.0020 in.), from 2.50 mm (0.0984 in.) to 3.30 mm (0.1299 in.).
(e) Place a new adjusting shim on the valve lifters.
(f) Install the camshafts (See page EM−54 ).
(g) Recheck the valve clearance.
(h) Install the distributor (See page IG−11 ).
10. REINSTALL CYLINDER HEAD COVER
(a) Install the gasket to the cylinder head cover.
(b) Install the cylinder head cover with the 13 bolts.
11. RECONNECT HIGH −TENSION CORDS TO SPARK
PLUGS (See page IG−1 )
12. RECONNECT HEA TER VALVE AND ENGINE WIRE TO
COWL PANEL
(a) Connect the heater valve with the 2 bolts.
(b) Connect the ground strap and engine wire with the 2 bolts.
13. REINSTALL THROTTLE BODY (See page SF−48 )
14. REFILL RADIATOR WITH ENGINE COOLANT
15. CHECK AND ADJUST IGNITION TIMING (See page EM−10 )
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

P08374A16075
1 Dot Mark
EM−32
−
ENGINE MECHANICAL CYLINDER HEAD
1996 LAND CRUISER (RM451U)
30. REMOVE CYLINDER HEAD COVER
Remove the 13 bolts, cylinder head cover and gasket.
31. REMOVE SPARK PLUGS
32. SET NO. 1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley and align its groove with the ”0”
mark on the timing chain cover.
(b) Check that the timing marks (1 and 2 dots) of the camshaft
drive and driven gears are in straight line on the cylinder
head surface as shown in the illustration.
If not, turn the crankshaft 1 revolution (360° ) and align the
marks as above.
33. REMOVE CHAIN TENSIONER
Remove the 2 nuts, chain tensioner and gasket.
34. REMOVE CAMSHAFT TIMING GEAR
(a) Remove the semi−circular plug.
(b) Place the matchmarks on the camshaft timing gear and timing chain.
(c) Hold the intake camshaft with a wrench, remove the bolt and distributor gear.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

Front Mark
P09890
Push
P08374A16075
1 Dot Mark
−
ENGINE MECHANICAL CYLINDER HEAD
EM−59
1996 LAND CRUISER (RM451U)
6. INSTALL CHAIN TENSIONER
(a) Place a new gasket so that the front mark is toward the
front side.
(b) Push the tensioner by hand until it touches the head installation surface, then install the 2 nuts.
(c) Tighten the 2 nuts. Torque: 21 N·m (210 kgf·cm, 15 ft·lbf)
7. CHECK VALVE TIMING
(a) Turn the crankshaft pulley, and align its groove with the timing mark ”0” of the timing chain cover.
NOTICE:
Always turn the crankshaft clockwise.
(b) Check that the timing marks (1 and 2 dots) of the camshaft
drive and driven gears are in straight line on the cylinder
head surface as shown in the illustration.
If not, turn the crankshaft 1 revolution (360° ) and align the
marks as above.
8. CHECK AND ADJUST VALVE CLEARANCE (See page
EM−4)
Turn the camshaft and position the cam lobe upward and check
and adjust the valve clearance.
Valve clearance (Cold):
Intake0.15 − 0.25 mm (0.006 − 0.010 in.)
Exhaust0.25 − 0.35 mm (0.010 − 0.041 in.)
9. INSTALL SPARK PLUGS
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

P22687
P08512
IG−2
−
IGNITION IGNITION SYSTEM
736
Author: Date:
1996 LAND CRUISER (RM451U)
2. REMOVE NO.2 PCV HOSE
3. REMOVE AIR CLEANER HOSE
4. DISCONNECT THROTTLE CABLE
5. REMOVE NO.2 AND NO.3 CYLINDER HEAD COVERS
Remove the 4 bolts and head covers.
6. DISCONNECT HIGH −TENSION CORDS FROM SPARK
PLUGS
(a) Remove the 2 mounting bolts of the No.1 and No.2 cord clamps.
(b) Disconnect the high −tension cords at the rubber boot.
Do not pull on the cords.
NOTICE:
Pulling on or bending the cords may damage the conductor
inside.
7. DISCONNECT HIGH−TENSION CORDS FROM DIS- TRIBUTOR CAP AND IGNITION COIL
(a) Using a screwdriver, lift up the lock claw and disconnect
the holder from the distributor cap (ignition coil).
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

IG−4
−
IGNITION IGNITION SYSTEM
738
Author: Date:
1996 LAND CRUISER (RM451U)
NOTICE:
Check that the holder is correctly installed to the grommet
and distributor cap as shown in the illustration.
(c) Check that the lock claw of the holder is engaged by lightly
pulling the holder.
10. RECONNECT HIGH −TENSION CORDS TO SPARK
PLUGS
(a) Secure the high −tension cords with the cord clamps as
shown in the illustration.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

IG0152
P03783
−
IGNITION IGNITION SYSTEM
IG−5
739
Author: Date:
1996 LAND CRUISER (RM451U)
(b) Install the No.1 and No.2 cord clamps with the 2 bolts.
11. INSTALL NO.2 AND NO.3 CYLINDER HEAD COVERS
Install the head covers with the 4 bolts.
12. CONNECT THROTTLE CABLE
13. INSTALL AIR CLEANER HOSE
Install the air cleaner hose with the 2 clamp bolts.
14. INSTALL NO.2 PCV HOSE
15. DISCONNECT HIGH −TENSION CORDS FROM SPARK
PLUGS
16. REMOVE SPARK PLUGS
Using a 16 mm plug wrench, remove the spark plug.
17. CLEAN SPARK PLUGS
Using a spark plug cleaner or wire brush, clean the spark plug.
18. VISUALLY INSPECT SPARK PLUGS
Check the spark plug for electrode wear, threads damage and
insulator damage.
If abnormal, replace the plugs. Recommended spark plugs:
ND: K16R −U
NGK: BKR5EYA
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

P03792
IG−6
−
IGNITION IGNITION SYSTEM
740
Author: Date:
1996 LAND CRUISER (RM451U)
19. ADJUST ELECTRODE GAP
Carefully bend the outer electrode to obtain the correct elec-
trode gap.
Correct electrode gap: 0.8 mm (0.031 in.)
20. INSTALL SPARK PLUGS
Using a 16 mm plug wrench, install the spark plug. Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
21. RECONNECT HIGH −TENSION CORDS TO SPARK
PLUGS
NOTICE:
”Cold” and ”Hot” in the following sentences express the
temperature of the coils themselves. ”Cold” is from −10° C
(14 °F) to 50° C (122°F) and ”Hot” is from 50 °C (122° F) to
100 °C (212 °F).
22. DISCONNECT IGNITION COIL CONNECTOR
23. DISCONNECT HIGH−TENSION CORD
24. INSPECT PRIMARY COIL RESISTANCE
Using an ohmmeter, measure the resistance between the posi-
tive (+) and negative (−) terminals. Primary coil resistance:
Cold: 0.36 − 0.55 Ω
Hot: 0.45 − 0.65 Ω
If the resistance is not as specified, replace the ignition coil.
25. INSPECT SECONDARY COIL RESISTANCE
Using an ohmmeter, measure the resistance between the posi-
tive (+) and high −tension terminals.
Secondary coil resistance:
Cold: 9.0 − 15.4 kΩ
Hot: 11.4 − 18.1 kΩ
If the resistance is not as specified, replace the ignition coil.
26. RECONNECT HIGH−TENSION CORD
27. RECONNECT IGNITION COIL CONNECTOR
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

MA04U−01
P04771
−
MAINTENANCE ENGINE
MA−5
45
Author: Date:
1996 LAND CRUISER (RM451U)
ENGINE
INSPECTION
HINT:
Inspect these items when the engine is cold.
1. INSPECT DRIVE BELT (See page CH−2)
2. INSPECT AIR FILTER
(a) Visually check that the air cleaner element is not exces- sively dirty, damaged or oily.
If necessary, replace the air cleaner element.
(b) Clean the element with compressed air. First blow from the inside thoroughly, then blow off the
outside of the element.
3. REPLACE AIR FILTER
Replace the air cleaner element with a new one.
4. REPLACE SPARK PLUGS (See page IG−1 )
5. REPLACE ENGINE OIL AND OIL FILTER (See page LU−2)
6. REPLACE ENGINE COOLANT (See page CO−2)
7. INSPECT CHARCOAL CANISTER (See page EC−6 )
8. REPLACE GASKET IN FUEL TANK CAP (See page
EC−6)
9. INSPECT FUEL LINES AND CONNECTIONS (See page EC−6)
10. INSPECT EXHAUST PIPES AND MOUNTINGS
Visually inspect the p ipes, hangers and connections for severe
corrosion, leaks or damage.
11. ADJUST VALVE CLEARANCE (See page EM−4)
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010