Section 03 ENGINE
Sub-Section 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
03-04-8
Measuring (on bench)
Once engine is disassembled, check crankshaft
deflection on V-shaped blocks. If deflection ex-
ceeds the specified tolerance, it can be worn
bearings or a bent crankshaft. Remove crankshaft
bearings and check deflection again on V-shaped
blocks to determine the defective part(s). See
measurement A in following illustration.
TYPICAL
1. Measure at mid point between the key and the first thread
A. See table below
Crankshaft Deflection on PTO Side
Crankshaft Deflection on MAG Side
Crankshaft Deflection in Center of
Crankshaft
NOTE:
Crankshaft deflection can not be cor-
rectly 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)
443 75.5 (2.972) 0.05 (.002)
454, 494
and 583
86 (3.386)
0.06 (.002)
503 82.5 (3.248)
670 100 (3.937)
ENGINE TYPE
MAXIMUM ON MAG SIDE
mm (in)
All 0.03 (.001)
ENGINE TYPE
MAXIMUM IN CENTER
OF CRANKSHAFT
All 0.08 mm (.0031 in)
A
A01C0RA
1
ENGINE
TYPE
NEW PARTS
MIN. – MAX.
WEAR
LIMIT
443 and 503
0.20 – 0.53 mm
(.008 – .021 in)
1.00 mm
(.039 in)
454, 494, 583
and 670
0.40 – 0.75 mm
(.016 – .029 in)
1.20 mm
(.047 in)
A01C0SA
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