Toyota Land Cruiser 1988 Repair Manual page 91

EM-60
ENGINE MECHANICAL- Cylinder Block
2. INSPECT PISTON DIAMETER AND OIL
CLEARANCE
(a) Using a micrometer, measure the piston diameter at
a right angle to the piston pin hole center line, 16
mm (0.63 in.) below the skirt bottom edge.
Standard diameter:
STD size 93.963 - 93.993 mm
(3.6993- 3.7005 in.)
0/S 0.50 94.463- 94.493 mm
(3.7190- 3.7202 in.}
.__ _ _ _ _ _ _ _ _ _ _ _ ..;:;;.EM;.;.;.13=18
0/S 1.00 94.963- 94.993 mm
(3.7387- 3.7399 in.)
0/S 1.50 95.463-95.493 mm
(3.7584- 3.7596 in.}
EM1319
110
EM0224
EM2552
(b) Measure the cylinder bore diameter in thrust direc-
tions. (See step 5 on page EM-57)
(c) Subtract the piston diameter measurement from the
cylinder bore diameter measurement.
Oil clearance: 0.027 - 0.047 mm
(0.0011 -0.0019 in.}
If the oil clearance is not within specification, replace the
piston. If necessary, rebore all six cylinders and replace all
six pistons. If necessary, replace the cylinder block.
3. INSPECT CLEARANCE BETWEEN WALL OF
. PISTON RING GROOVE AND NEW PISTON RING
Using a thickness gauge, measure the clearance between
new piston ring and the wall of the piston ring groove.
Ring groove clearance:
No.1 0.030-0.070 mm 0012-0.0028 in.)
No.2 0.050- 0.090 mm 0020- 0.0035 in.)
If the clearance is not within specification, replace the
piston.
4. INSPECT PISTON RING END GAP
(a) Insert the piston ring into the cylinder bore.
(b) Using a piston, push the piston ring a little beyond
the bottom of the ring travel.
(11 0 mm or 4.33 in. from top surface of cylinder
block)
(c) Using a thickness gauge, measure the end gap.
Standard end gap:
No.1
No.2
0.200 - 0.420 mm
(0.0079-- 0.0165 in.)
0.500 - 0. 720 mm
(0.0197- 0.0283 in.)
Oil (Side rail) 0.200-0.820 mm
(0.0079- 0.0323 in.)
Maximum end gap:
No. 1 1.02 mm (0.0402 in.)
No.2 1.32 mm (0.0520 in.)
Oil (Side rail) 1.42 mm (0.0559 in.)
If the gap is greater than maximum, replace the piston
ring. If the gap is greater than maximum, even with a new
piston ring, rebore the cylinder and use an 0 IS piston
ring.