Section 04 ENGINE
Subsection 05 (COMPRESSION TEST AND ENGINE DIMENSION MEASUREMENT)
MMR2000_120_04_05A.FM 04-05-5
RING/PISTON GROOVE
CLEARANCE
NOTE: These clearances are applicable for 3 rings;
top, second and oil ring.
Using a feeler gauge check clearance between
ring and groove. Replace piston if clearance ex-
ceeds specified tolerance. See above table.
RING/PISTON GROOVE CLEARANCE
RING END GAP
Position ring 16 mm (5/8 in) from top of cylinder.
NOTE: In order to correctly position the ring in the
cylinder, use piston as a pusher.
Using a feeler gauge, check ring end gap. Replace
ring, if gap exceeds specified tolerance. See
above table.
1. Feeler gauge
2. Ring properly positioned in cylinder
CONNECTING ROD BIG END SIDE
CLEARANCE
Using a feeler gauge, measure distance between
connecting rod and crankshaft counterweight. If
the distance exceeds specified tolerance, replace
the crankshaft.
MEASURE SIDE CLEARANCE
STANDARD SERVICE LIMIT
0.015 - 0.045 mm
(0.0006 - 0.0018 in)
0.15 mm
(0.006 in)
STANDARD SERVICE LIMIT
TOP AND
SECOND
0.2 - 0.4 mm
(0.008 - 0.016 in)
1.0 mm
(0.04 in)
OIL
0.15 - 0.35 mm
(0.006 - 0.014 in)
1.0 mm
(0.04 in)
A31C1QA
STANDARD SERVICE LIMIT
0.1 - 0.7 mm
(0.004 - 0.028 in)
1.1 mm
(0.043 in)
A31C1RA
2
1
A31C1SA
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