LEXUS SC400 1991 Service Repair Manual

(b) Remove the union bolt and two gaskets, and disconnectthe cold start injector tube from the RH delivery pipe.
(c) Remove the two bolts and gasket, and disconnect the EGR pipe from the air intake chamber.
(d) Remove the four bolts, eight nuts and A/T throttle cable bracket.
(e) (USA Spec.)
Disconnect the check (ºDIAGNOSISº) connector brack-
et from the air intake chamber.
(f) (Exc. USA Spec.) Remove the connector bracket from the check
(ºDIAGNOSISº) connector.
(g) Remove the air intake chamber assembly and four gaskets.
17. DISCONNECT FUEL INLET HOSE FROM LH DELIVERY PIPE
Remove the pulsation damper and two gaskets, and discon-
nect the inlet hose.
18. D I S C O N N E C T F U E L R E T U R N H O S E F R O M F U E L RETURN PIPE
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19. DISCONNECT EGR PIPE FROM RH CYLINDER HEADRemove the bolt holding the EGR pipe to the cylinder head,
and disconnect the EGR pipe.
20. DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD Remove the two bolts, and disconnect the engine wire.
21. DISCONNECT ENGINE WIRE FROM DELIVERY PIPES, REAR WATER BY±PASS JOINT AND RH CYLINDER
HEAD
(a) Remove the four bolts holding the engine wire to thedelivery pipes, and disconnect the engine wire from the
delivery pipe.
(b) Remove the two bolts holding the engine wire to the rear
water by±pass joint, and disconnect the engine wire
from the rear water by±pass joint.
(c) Remove the two bolts holding the engine wire to the rear
side of the RH cylinder head, and disconnect the engine
wire from the RH cylinder head.
(d) Disconnect the two engine wire connectors from the connector bracket on the front side of the LH delivery
pipe.
(e) Disconnect the eight injector connectors.
ST±12
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22. REMOVE FUEL RETURN PIPE(a) Remove the bolt holding the return pipe to the LHcylinder head.
(b) Remove the union bolt, two gaskets and return pipe.
23. REMOVE DELIVERY PIPES AND INTAKE MANIFOLD ASSEMBLY
(a) Remove the six bolts and four nuts holding the intakemanifold to the cylinder heads.
(b) Remove the two delivery pipe and intake manifold assembly.
(c) Remove the two intake manifold gaskets.
24. DISCONNECT HEATER WATER HOSES FROM WATER BY±PASS PIPE AND REAR WATER BY±PASS JOINT
25. REMOVE WATER BY±PASS PIPE (a) Remove the two mounting bolts.
(b) Pull out the water by±pass pipe from the water pump.
(c) Remove the O±ring from the water by±pass pipe.
26. REMOVE REAR WATER BY±PASS JOINT Remove the four nuts, water by±pass joint and two gaskets.
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27. REMOVE STARTER(a) Remove the two bolts holding the starter to the cylinderblock.
(b) Disconnect the starter connector.
(c) Remove the nut, and disconnect the starter wire.
(d) Disconnect the wire clamp from the wire bracket, and remove the starter.
ST±14
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COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY
DISASSEMBLY OF STARTER
1. REMOVE FIELD FRAME AND ARMATURE(a) Remove the nut, and disconnect the lead wire from themagnetic switch terminal.
(b) Remove the two through bolts, spring washer, wire bracket and two O±rings.
(c) Pull out the field frame together with the armature.
(d) Remove the O±ring from the field frame.
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2. REMOVE STARTER HOUSING, CLUTCH ASSEMBLYAND GEARS
(a) Remove the two mounting screws.
(b) Remove the following parts from the magnetic switch:(1) Starter housing
(2) Return spring
(3) Pinion gear
(4) Bearing
(5) Idler gear
(6) Clutch assembly
3. REMOVE STEEL BALL Using a magnetic finger, remove the steel ball from the clutch
shaft hole.
4. REMOVE BRUSH HOLDER Using a screwdriver, hold the spring back and disconnect the
brush from the brush holder. Disconnect the four brushes,
and remove the brush holder.
5. REMOVE ARMATURE FROM FIELD FRAME
ST±16
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INSPECTION AND REPAIR OF STARTER
Armature Coil
1. INSPECT COMMUTATOR FOR OPEN CIRCUITUsing an ohmmeter, check that there is continuity between
the segments of the commutator.
If there is no continuity, replace the armature.
2. INSPECT COMMUTATOR FOR GROUND Using an ohmmeter, check that there is no continuity be-
tween the commutator and armature coil core.
If there is continuity, replace the armature.
Commutator
1. INSPECT COMMUTATOR FOR DIRTY AND BURNTSURFACE
If the surface is dirty or burnt, correct with sandpaper
(No.400) or on a lathe.
2. INSPECT COMMUTATOR FOR RUNOUT (a) Place the commutator on V±blocks.
(b) Using a dial indicator, measure the circle runout.
Maximum circle runout: 0.05 mm (0.0020 in.)
If the circle runout is greater than maximum, correct it on a
lathe.
3. INSPECT COMMUTATOR DIAMETER Using a vernier caliper, measure the diameter.
Standard diameter: 35.0 mm (1.378 in.)
Minimum diameter: 34.0 mm (1.339 in.)
If the diameter is less than minimum, replace the armature.
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4. INSPECT UNDERCUT DEPTHCheck that the undercut depth is clean and free of foreign
material. Smooth out the edge.
Standard undercut depth: 0.7±0.9 mm
(0.028±0.035 in.)
Minimum undercut depth: 0.2 mm (0.008 in.)
If the undercut depth is less than minimum, correct it with a
hacksaw blade.
Field Coil (Field Frame)
1. INSPECT FIELD COIL FOR OPEN CIRCUIT Using an ohmmeter, check that there is continuity between
the lead wire and field coil brush lead.
If there is no continuity, replace the field frame.
2. INSPECT FIELD COIL FOR GROUND Using an ohmmeter, check that there is no continuity be-
tween the field coil end and field frame.
If there is continuity, replace the field frame.
Brushes
INSPECT BRUSH LENGTHUsing a vernier caliper, measure the brush length.
Standard length: 15.0±15.5 mm
(0.591±0.610 in.)
Minimum length: 9.5 mm (0.374 in.)
If the length is less than minimum, replace the brush holder
and field frame.
ST±18
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Brush Springs
INSPECT BRUSH SPRING LOADTake the pull scale reading the instant the brush spring sepa-
rates from the brush.
Standard installed load:
26±32 N (2.7±3.3 kgf, 6.0±7.3 lbf)
If the installed load is not as specified, replace the brush
springs.
Brush Holder
INSPECT BRUSH HOLDER INSULATIONUsing an ohmmeter, check that there is no continuity be-
tween the positive (+) and negative (±) brush holders.
If there is continuity, repair or replace the brush holder.
Clutch and Gears
1. INSPECT GEAR TEETHCheck the gear teeth on the pinion gear, idler gear and the
clutch assembly for wear or damage.
If damaged, replace the gear or clutch assembly.
If damaged, also check the flywheel ring gear for wear or
damage.
2. INSPECT CLUTCH PINION GEAR Rotate the pinion gear counterclockwise and check that it
turns freely. Try to rotate the pinion gear clockwise and check
that it locks.
If necessary, replace the clutch assembly.
Bearings
1. INSPECT FRONT BEARING Turn each bearing by hand while applying inward force.
If resistance is felt or the bearing sticks, replace the bearing.
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2. IF NECESSARY, REPLACE FRONT BEARING(a) Using SST, remove the bearing.
SST 09286±46011
(b) Using a 10 mm nut and press, press in a new frontbearing.
NOTICE: Be careful of the bearing installation direction.
(c) Using a punch, stake the armature shaft.
3. INSPECT REAR BEARING Turn each bearing by hand while applying inward force.
If resistance is felt or the bearing sticks, replace the bearing.
4. IF NECESSARY, REPLACE REAR BEARING (a) Using SST and a press, press out the bearing.
SST 09950±00020
ST±20
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