1986 TOYOTA SUPRA check engine

7. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with timing
mark ºOº of the No.1 timing belt cover.
NOTICE: Always turn the crankshaft clockwise.
(b) Check that the timing marks of the camshaft timing pulleys
are aligned with the timing marks of the No.4 timing belt
cover.
If not, turn the crankshaft 1 revolution (360°).
8. REMOVE TIMING BELT FROM CAMSHAFT TIMING
PULLEYS
HINT (Re±using timing belt): Place matchmarks on the timing
belt and camshaft timing pulleys as shown in the illustration.
(a) Alternately loosen the 2 bolts, and remove them, the
tensioner and dust boot.
(b) Disconnect the timing belt from the camshaft timing pulleys.
± ENGINEENGINE MECHANICALEG±25

TIMING BELT COMPONENTS
INSPECTION
1. INSPECTION TIMING BELT
NOTICE:
wDo not bend, twist or turn the timing belt inside out.
wDo not allow the timing belt to come into contact with oil,
water or steam.
wDo not utilize timing belt tension when installing or re-
moving the mount bolt of the camshaft timing pulley.
If there are any defects, as shown in the illustrations, check
the following points.
(a) Premature parting
wCheck for proper installation.
wCheck the timing cover gasket for damage and proper
installation.
(b) If the belt teeth are cracked or damaged, check to see if either
camshaft is locked.
(c) If there is noticeable wear or cracks on the belt face, check
to see if there are nicks on the side of the idler pulley lock.
(d) If there is wear or damage on only one side of the belt, check
the belt guide and the alignment of each pulley.
(e) If there is noticeable wear on the belt teeth, check timing
cover for damage and check gasket has been installed
correctly and for foreign material on the pulley teeth.
If necessary, replace the timing belt.
2. INSPECT IDLER PULLEY
Check the turning smoothness of the idler pulley.
If necessary, replace the idler pulley.
3. INSPECT DRIVE BELT TENSIONER
Check the turning smoothness of the tensioner.
If necessary, replace the tensioner.
4. INSPECT TIMING BELT TENSIONER
(a) Visually check tensioner for oil leakage.
HINT: If there is only the faintest trace of oil on the seal on the
push rod side, the tensioner is all right.
If leakage is found, replace tensioner. EG±28
± ENGINEENGINE MECHANICAL

(b) Hold the tensioner with both hands and push the push rod
strongly against the floor or wall to check that it doesn't move.
If the push rod moves, replace the tensioner.
(c) Measure the protrusion of the push rod from the housing end.
Protrusion:
8.0±8.8 mm (0.315±0.346 in.)
If the protrusion is not as specified, replace the tensioner.
5. 2JZ±GTE M/T:
INSPECT DRIVE BELT TENSION DAMPER
Compress and extend the tension damper rod and check that
there is no abnormal resistance or unusual operation
sounds.
If there is any abnormality, replace the tension damper with
a new one.
NOTICE: When discarding the tension damper, use the follow-
ing procedure.
wFully extend the damper rod.
wUsing a drill, make a hole in the cylinder as shown to
release the gas inside.
CAUTION: The gas coming out is harmless, but be careful of
the chips which may fly up when drilling.
TIMING BELT INSTALLATION
1. INSTALL CRANKSHAFT TIMING PULLEY
(a) Align the pulley set key with the key groove of the pulley.
(b) Slide on the timing pulley facing the flange side inward.
± ENGINEENGINE MECHANICALEG±29

(c) 2JZ±GTE:
Install the timing belt plate with the bolt.
Torque: 7.8 NVm (80 kgfVcm, 69 in.Vlbf)
2. INSTALL IDLER PULLEY
(a) Apply adhesive to 2 or 3 threads of the pivot bolt.
Adhesive:
Part No. 08833±00080, THREE BOND 1344, LOCTITE
242 or equivalent
(b) Using a 10 mm hexagon wrench, install the plate washer and
pulley with the pivot bolt.
Torque: 34 NVm (350 kgfVcm, 25 ftVlbf)
(c) Check that the pulley bracket moves smoothly.
3. TEMPORARILY INSTALL TIMING BELT
NOTICE: The engine should be cold.
(a) Using the crankshaft pulley bolt, turn the crankshaft, and
align the timing marks on the crankshaft timing pulley and on
the oil pump body.
(b) Remove any oil or water on the crankshaft timing pulley and
idler pulley, and keep them clean.
(c) Install the timing belt on the crankshaft timing pulley and idler
pulley.
HINT (When re±using timing belt): Align the match marks of
the crankshaft timing pulley and timing belt, and install the
belt with the arrow pointing in the direction of engine revolu-
tion.
4. INSTALL TIMING BELT GUIDE
Install the guide, facing the cup side outward.
5. INSTALL NO.1 TIMING BELT COVER EG±30
± ENGINEENGINE MECHANICAL

(b) Using SST, align the timing marks of the camshaft timing
pulleys and No.4 timing belt cover.
SST 09960±10010 (09962±01000, 09963±01000)
11. INSTALL TIMING BELT
HINT (When re±using timing belt): Align the matchmarks of
the timing belt and camshaft timing pulleys.
(a) Remove any oil or water on the camshaft timing pulley, and
keep it clean.
(b) Install the timing belt, checking the tension between the
crankshaft timing pulley and exhaust camshaft timing pulley.
12. SET TIMING BELT TENSIONER
(a) Using a press, slowly press in the push rod using 981 ±9,807
N (100±1,000 kgf, 220±2,205 lbf) of force.
(b) Align the holes of the push rod and housing, pass a 1.5 mm
hexagon wrench through the holes to keep the push rod
retracted.
(c) Release the press.
(d) Install the dust boot onto the tensioner.
13. INSTALL TIMING BELT TENSIONER
(a) Temporarily install the tensioner with the 2 bolts.
(b) Alternately tighten the 2 bolts.
Torque: 26 NVm (270 kgfVcm, 20 ftVlbf)
EG±32± ENGINEENGINE MECHANICAL

(c) Remove the 1.5 mm hexagon wrench from the tensioner.
14. CHECK VALVE TIMING
(a) Slowly turn the crankshaft pulley 2 revolutions from TDC to
TDC.
NOTICE: Always turn the crankshaft clockwise.
(b) Check that each pulley aligns with the timing marks as shown
in the illustration.
If the marks do not align, remove the timing belt and reinstall
it.
15. INSTALL DRIVE BELT TENSIONER
Install the tensioner with the 3 bolts.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
NOTICE: Be careful not to drop the bolts inside the timing belt
cover.
16. INSTALL NO.2 TIMING BELT COVER
17. INSTALL NO.3 TIMING BELT COVER
18. INSTALL WATER PUMP PULLEY, FAN, FLUID COUPLING
ASSEMBLY AND DRIVE BELT
(See step 10 in water pump installation in Cooling Sys-
tem)
19. 2JZ±GTE M/T:
INSTALL DRIVE BELT TENSIONER DAMPER
Torque: 20 NVm (200 kgfVcm, 14 ftVlbf)
20. INSTALL RADIATOR ASSEMBLY
(See radiator installation in Cooling System)
21. ROAD TEST VEHICLE
Check for abnormal noise, shock, slippage, correct shift
points and smooth operation.
± ENGINEENGINE MECHANICALEG±33

3. INSPECT CYLINDER HEAD
A. Inspect for flatness
Using precision straight edge and feeler gauge, measure the
surfaces contacting the cylinder block, intake and exhaust
manifolds for warpage.
Maximum warpage:
0.10 mm (0.0039 in.)
If warpage is greater than maximum, replace the cylinder
head.
B. Inspect for cracks
Using a dye penetrant, check the combustion chamber, in-
take ports, exhaust ports and cylinder block surface for
cracks.
If cracked, replace the cylinder head.
4. CLEAN VALVES
(a) Using a gasket scraper, chip off any carbon from the valve
head.
(b) Using a wire brush, throughly clean the valve.
5. INSPECT VALVE STEMS AND GUIDE BUSHINGS
(a) Using a caliper gauge, measure the inside diameter of the
guide bushing.
Bushing inside diameter:
6.010±6.030 mm (0.2366±0.2374 in.)
EG±52± ENGINEENGINE MECHANICAL

(d) Using SST and a hammer, tap in a new guide bushing to the
specified protrusion height.
SST 09201±10000 (09201±01060), 09608±30022
(09608±05010)
Protrusion height:
Intake
12.3±12.7 mm (0.484±0.500 in.)
Exhaust
11.4±11.8 mm (0.449±0.465 in.)
HINT: Different bushings are used for the intake and exhaust.
(e) Using a sharp 6 mm reamer, ream the guide bushing to obtain
the standard specified clearance (See step 6) between the
guide bushing and valve stem.
7. INSPECT AND GRIND VALVES
(a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve face angle.
Valve face angle:
44.55
(c) Check the valve head margin thickness.
Standard margin thickness:
0.8±1.2 mm (0.031±0.047 in.)
Minimum margin thickness:
0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the
valve. EG±54
± ENGINEENGINE MECHANICAL