Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 959 / 1976

S06042
RH Piston
41.2 mm
LH Piston
MAHLE Piston
P12504
P12583
105 mm
EM7639
- ENGINE MECHANICAL CYLINDER BLOCK
EM-103
1046
Author: Date:
2001 SIENNA (RM787U)
10. INSPECT PISTON OIL CLEARANCE (MAHLE Piton)
(a) Using a micrometer, measure the piston diameter at right
angles to the piston pin center line, 41.2 mm (1.622 in.)
from the piston head.
Piston diameter:
87.453 - 87.467 mm (3.4430 - 3.4436 in.)
(b) Measure the cylinder bore diameter in the thrust direc-
tions. (See step 5.)
(c) Subtract the piston diameter measurement from the cylin-
der bore diameter measurement.
Standard oil clearance:
0.033 - 0.059 mm (0.0013 - 0.0023 in.)
Maximum oil clearance: 0.13 mm (0.0051 in.)
If the oil clearance is greater than maximum, replace all the 6
pistons. If necessary, replace the cylinder block.
HINT:
The shape of the piston varies for the RH and LH banks. The
RH piston is marked with ”R”, the LH piston with ”L”.
11. INSPECT PISTON RING GROOVE CLEARANCE
Using a feeler gauge, measure the clearance between new pis-
ton right and the wall of the ring groove.
Ring groove clearance:
No.1: 0.020 - 0.070 mm (0.0008 - 0.0028 in.)
No.2: 0.020 - 0.060 mm (0.0008 - 0.0024 in.)
If the clearance is not as specified, replace the piston.
12. 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 bot-
tom of the ring travel, 105 mm (4.13 in.) from the top of the
cylinder block.
(c) Using a feeler gauge, measure the end gap.
Standard end gap:
No.1: 0.25 - 0.35 mm (0.0098 - 0.0138 in.)
No.2: 0.35 - 0.45 mm (0.0138 - 0.0177 in.)
Oil (Side rail): 0.15 - 0.40 mm (0.0059 - 0.0157 in.)
Maximum end gap:
No.1: 0.95 mm (0.0374 in.)
No.2: 1.05 mm (0.0413 in.)
Oil (Side rail): 1.00 mm (0.0394 in.)
If the end gap is greater than maximum, replace the piston ring.
If the end gap is greater than maximum, even with a new piston
ring, replace the cylinder block.