Section 04 ENGINE
Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-11
TYPICAL
CONNECTING ROD/PISTON PIN
CLEARANCE
Measure piston pin with its needle bearing. Com-
pare to inside diameter of connecting rod.
CONNECTING ROD/CRANKPIN
CLEARANCE
CRANKSHAFT END-PLAY
443, 494, 503 and 670 Engine Types
End-play is not adjustable but it should be be-
tween 0.10 - 0.30 mm (.004 - .012 in).
CRANKCASE/ROTARY VALVE GAP
First Method
To measure this gap use a feeler gauge inserted
between rotary valve and upper crankcase with
the rotary valve cover in place
without its O-ring
.
Check the most surface as possible. Follow the
same procedure with the lower crankcase.
A01C0SA
A01C3GA
A01C3HA
ENGINE
TYPE
NEW PARTS
MIN. - MAX.
WEAR
LIMIT
All
0.03 - 0.012 mm
(.0001 - .0005 in)
0.015 mm
(.0006 in)
ENGINE
TYPE
NEW PARTS
MIN. - MAX.
WEAR
LIMIT
443 and 503
0.020 - 0.033 mm
(.0008 - .0013 in)
0.05 mm
(.0020 in)
494, 583
and 670
0.038 - 0.050 mm
(.0015 - .0020 in)
0.06 mm
(.0024 in)
ENGINE TYPE MINIMUM MAXIMUM
Liquid cooled
engines
0.27 mm
(0.011 in)
0.40 mm
(0.016 in)
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