1991 LEXUS SC300 oil

22. REMOVE ALTERNATOR(a) Disconnect the alternator connector.
(b) Remove the cap and nut, and disconnect the alternatorwire.
(c) Remove the bolt, and disconnect the A/T oil cooler pipe bracket.
(d) Remove the nut and alternator.
23. REMOVE DRIVE BELT TENSIONER Remove the bolt, two nuts and tensioner.
24. REMOVE SPARK PLUGS Using a 16 mm plug wrench, remove the eight spark plugs.
25. IF RE±USING TIMING BELT, CHECK INSTALLATION MARKS ON TIMING BELT
Check that there are four installation marks on the timing belt
by turning the crankshaft pulley as shown in the illustration.
If the installation marks have disappeared, place a new
installation mark on the timing belt before removing each
part.
26. SET NO.1 CYLINDER TO TDC/COMPRESSION (a) Turn the crankshaft pulley and align its groove with thetiming mark ºOº of the No.1 timing belt cover.
EM±40
±
ENGINE MECHANICAL Timing Belt
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36. REMOVE NO.2 IDLER PULLEYRemove the pulley bolt and idler pulley.
37. REMOVE NO.1 IDLER PULLEY Using a 10 mm hexagon wrench, remove the bolt, idler pulley
and plate washer.
38. REMOVE CRANKSHAFT TIMING PULLEY Using SST, remove the timing pulley.
SST 09213±60017 (09213±00050)
INSPECTION OF TIMING BELT
COMPONENTS
1. INSPECT TIMING BELTNOTICE:
w Do not bend, twist or turn the timing belt inside out.
w Do not allow the timing belt to come into contact with oil,
water or steam.
w Do not utilize timing belt tension when installing or
removing the mounting bolt of the camshaft timing
pulley.
If there are any defects as shown in the illustrations, check
the following points:
(a) Premature parting
w Check for proper installation.
w Check the timing cover gasket for damage and
proper installation.
EM±44
±
ENGINE MECHANICAL Timing Belt
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3. 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 the tensioner.
(b) Hold the tensioner in both hands and push the push rodstrongly 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: 10.5±11.5 mm (0.413±0.453 in.)
If the protrusion is not as specified, replace the tensioner.
INSTALLATION OF TIMING BELT
(See Components pages EM±33 and 34)
1. INSTALL CRANKSHAFT TIMING PULLEY (a) Align the pulley set key on the crankshaft with the keygroove of the timing pulley.
(b) Using SST and a hammer, tap in the timing pulley, facing
the flange side rearward.
SST 09223±46011
2. INSTALL NO. 1 IDLER PULLEY (a) Apply adhesive to two or three threads of the pulley boltend.
Adhesive: Part No. 08833±00080, THREE BOND 1344, LOCTITE
242 OR equivalent
(b) Using a 10 mm hexagon wrench, install the plate washer
and idler pulley with the pulley bolt. Torque the pulley
bolt.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
(c) Check that the pulley bracket moves smoothly.
EM±46
±
ENGINE MECHANICAL Timing Belt
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3. INSTALL NO. 2 IDLER PULLEY(a) Install the idler pulley with the pulley bolt. Torque thepulley bolt.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
(b) Check that the idler pulley moves smoothly.
4. TEMPORARILY INSTALL TIMING BELT NOTICE: The engine should be cold.
(a) Using the crankshaft pulley bolt, turn the crankshaft andalign the timing marks of the crankshaft timing pulley
and oil pump body.
(b) Remove any oil or water on the crankshaft timing pulley,
No. 1 idler pulley and No. 2 idler pulley, and keep them
clean.
(c) Align the installation mark on the timing belt with the dot
mark of the crankshaft timing pulley.
(d) Install the timing belt on the crankshaft timing pulley, No.
1 idler pulley and No. 2 idler pulley.
5. INSTALL TIMING BELT GUIDE (NO. 1 CRANK ANGLE SENSOR PLATE)
Install the belt guide, facing the cup side forward.
6. INSTALL TIMING BELT COVER SPACER (a) Install the gasket to the spacer.
(b) Install the spacer.
±
ENGINE MECHANICAL Timing BeltEM±47
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11. INSTALL LH CAMSHAFT TIMING PULLEY(a) Align the knock pin on the camshaft with the knock pingroove of the timing pulley.
(b) Slide the timing pulley, facing the ºLº mark forward.
(c) Using SST, install and torque the pulley bolt.
SST 09278±54012
Torque: 108 N Vm (1,100 kgf Vcm, 80 ft Vlbf)
12. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) (Crankshaft Pulley Position)Turn the crankshaft pulley, and align its groove with the
ºOº timing mark of the No.1 timing belt cover.
(b) (Camshaft Timing Pulley Position) Using SST, t urn the camshaft timing pulley, and align the
timing marks of the camshaft timing pulley and timing
belt rear plate.
SST 09278±54012
13. INS TALL TIMING BE LT TO LH CAMS HAFT TIMING PULLEY
(a) Align the installation mark on the timing belt with the end
of the hydraulic pump.
(b) Remove any oil or water on the LH camshaft timing pulley, and keep it clean.
(c) Using SST, slightly turn the LH camshaft timing pulley
clockwise. Align the installation mark on the timing belt
with the timing mark of the camshaft timing pulley, and
hang the timing belt on the LH camshaft timing pulley.
SST 09278±54012
±
ENGINE MECHANICAL Timing BeltEM±49
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(d) Using SST, align the timing marks of the LH camshaftpulley and timing belt rear plate.
SST 09278±54012
(e) Check that the timing belt has tension between the crankshaft timing pulley and LH camshaft timing pulley.
14. INSTALL TIMING BELT TO RH CAMSHAFT TIMING PULLEY
(a) Remove any oil or water on the RH camshaft timing andwater pump pulley, and keep them clean.
(b) Using SST, slightly turn the RH camshaft timing pulley clockwise. Align the installation mark on the timing belt
with the timing mark of the camshaft timing pulley, and
hang the timing belt on the RH camshaft timing pulley.
SST 09278±54012
(c) Using SST, align the timing marks of the RH camshaft pulley and timing belt rear plate.
SST 09278±54012
(d) Check that the timing belt has tension between the RH
camshaft timing pulley and LH camshaft pulley.
15. SET TIMING BELT TENSIONER (a) Using a press, slowly press in the push rod using981±9,807 N (100±1,000 kgf, 220±2,205 lbf) of
pressure.
(b) Align the holes of the push rod and housing, pass a 1.27
mm hexagon wrench through the holes to keep the
setting position of the push rod.
(c) Release the press.
(d) Install the dust boot to the tensioner.
EM±50
±
ENGINE MECHANICAL Timing Belt
WhereEverybodyKnowsYourName

19. INSTALL DRIVE BELT TENSIONERInstall the tensioner with the bolt and two nuts.
Torque: 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
HINT: Use bolt 106 mm (4.17 in.) in length.
20. INSTALL ALTERNATOR (a) Install the alternator and A/T oil cooler pipe bracket withthe bolt and nut.
Torque: 37 N Vm (380 kgf Vcm, 27 ft Vlbf)
(b) Connect the alternator connector.
(c) Connect the alternator wire with the nut and cap.
21. INSTALL RH DISTRIBUTOR HOUSING (a) Install the distributor housing with the three bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT:
w The RH distributor housing is marked with ºRº.
w Each bolt length is indicated in the illustration.
Bolt length: A 38 mm (1.50 in.)
B 96 mm (3.78 in.)
(b) Connect the cam position sensor connector.
22. INSTALL LH DISTRIBUTOR HOUSING (a) Install the distributor housing with the three bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT:
w The LH distributor housing is marked with ºLº.
w Each bolt length is indicated in the illustration.
Bolt length: A 38 mm (1.50 in.)
B 80 mm (3.15 in.)
23. INSTALL DISTRIBUTOR ROTORS (a) Align the protrusion of the distributor rotor with thegroove of the camshaft timing pulley.
(b) Install the distributor rotor with the two bolts. Install the two distributor rotors.
Torque: 3.8 N Vm (39 kgf Vcm, 34 in. Vlbf)
EM±52±
ENGINE MECHANICAL Timing Belt
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24. INSTALL DISTRIBUTOR CAPSInstall the distributor cap with the three bolts. Install the two
distributor caps.
Torque: 3.8 N Vm (39 kgf Vcm, 34 in. Vlbf)
25. INSTALL RH NO.2 TIMING BELT COVER
(a) Install the four gaskets to the timing belt cover.
(b) Install the connector grommet to the timing belt cover.
(c) Install the timing belt cover with the five bolts.
Torque (12 mm head bolt):
16 NVm (160 kgf Vcm, 12 ft Vlbf)
HINT (12 mm head bolt): Use bolts 106 mm (4.17 in.) in
length.
(d) Install the wire clamp to the timing belt cover.
(e) Install the cam position sensor connector to the ignition
coil bracket.
26. INSTALL LH NO.2 TIMING BELT COVER (a) Install the two gaskets to the timing belt cover.
(b) Run the cam po sition sensor wire through the timing belt
cover hole.
(c) Install the timing belt cover and connector bracket with the three bolts.
(d) Connect the cam position sensor connector.
(e) Install cam position sensor c onnector to connector
bracket.
(f) Install the connector grommet to the timing belt cover hole.
27. INSTALL DRIVE BELT IDLER PULLEY Install the idler pulley and cover plate with the pulley bolt.
Torque: 37 N Vm (380 kgf Vcm, 27 ft Vlbf)
±
ENGINE MECHANICAL Timing BeltEM±53
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