Section 04
ENGINE
Sub-Section 04
(LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-7
First, check deflection with crankshaft in engine.
If deflection exceeds the specified tolerance, it
can be either bearing wear or bent crankshaft. Re-
move crankshaft bearings and check deflection
again on V-shaped blocks at A measurement as
illustrated.
1. Measure at mid point between the key and the first thread
Crankshaft Deflection on PTO Side
Crankshaft Deflection on MAG Side
NOTE :
Crankshaft deflection can not be
correctly measured between centers of a
lathe.
If the deflection exceeds the specified tolerance,
crankshaft should be repaired or replaced.
CONNECTING ROD BIG END
AXIAL PLAY
Using a feeler gauge, measure distance between
thrust washer and crankshaft counterweight. If
the distance exceeds specified tolerance, repair
or replace the crankshaft.
TYPICAL
CONNECTING ROD / PISTON PIN
CLEARANCE
Measure piston pin with its needle bearing. Com-
pare to inside diameter of connecting rod.
ENGINE
TYPE
DISTANCE A
mm (in)
MAXIMUM ON PTO SIDE
mm (in)
377, 443
75.5 (2.972)
0.05 (.002)
454, 494, 582
and 583
86 (3.386)
0.06 (.002)
503
82.5 (3.248)
670
100 (3.937)
599, 779
94.5 (3.720)
0.03 (.001)
ENGINE TYPE
MAXIMUM ON MAG
SIDE
mm (in)
All except 779
0.03 (.001)
779
0.05 (.002)
A
A01C0RA
1
ENGINE
TYPE
NEW PARTS
MIN. – MAX.
WEAR
LIMIT
247, 277, 377
443 and 503
0.20 – 0.53 mm
(.008 – .021 in)
1.00 mm
(.039 in)
454, 494, 582,
583, 670 and 779
0.40 – 0.75 mm
(.016 – .029 in)
1.20 mm
(.047 in)
A01C0SA
A01C3GA
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