1991 LEXUS SC400 Service Repair Manual

Page 2209 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION OF BATTERY
1. INSPECT BATTERY SPECIFIC GRAVITY ANDELECTROLYTE LEVEL
(a)  Check the specific gravity of each cell.
Standard specific gravity:
1.27±1.29 when fully charged at 20 5C(68 5F)
I

Page 2210 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION OF HIGH±TENSION CORDS
1.  REMOVE HIGH±TENSION CORDS (See page IG±11)
2.  INSPECT HIGH±TENSION CORDS (b)  Using an ohmmeter, measure the resistance.
Maximum resistance: 25 k  per cord

Page 2211 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION AND ADJUSTMENT OF
VALVE CLEARANCE
HINT: Inspect and adjust the valve clearance when the 
engine is cold.
1.  DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY
CAUTION: Work must be starte

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LEXUS SC400 1991  Service Repair Manual 
6.  REMOVE UPPER HIGH±TENSION CORD COVER(a)  Remove the two mounting bolts.
(b)  Disconnect  the front side claw groove of the cord coverfrom the claw of the lower cover, and remove the cord
cover.

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LEXUS SC400 1991  Service Repair Manual 
11.  DISCONNECT FUEL INLET HOSE FROM LH DELIVERYPIPE
Remove the pulsation damper and two gaskets, and discon-
nect the inlet hose.
12. 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

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LEXUS SC400 1991  Service Repair Manual 
(c)  Remove the two bolts and two nuts, disconnect thethrottle body from the air intake chamber.
(d)  Disconnect  the following hoses, and remove the throttle body:
(1) PCV hose from throttle body
(2

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LEXUS SC400 1991  Service Repair Manual 
16.  REMOVE LH CYLINDER HEAD COVER(a)  Remove the two bolts holding the high±tension cordclamp to the cylinder head.
(b) Disc onnect the high±tension cords from the spark
plugs.
(c) Disconnect the

Page 2216 of 4087

LEXUS SC400 1991  Service Repair Manual 
(b)  Check that the timing marks of the camshaft timingpulleys and timing belt rear plates aligned.
If not, turn the crankshaft one revolution (360 5) and align the
mark as above.
20. INSPECT VALVE C