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Fig.
22
71668C
The pistons
are
tapered, being smaller
at the
upper
than
at
the
lower end. The clearance between the
lower end
of
the piston and the cylinder is as follows
on the
various models:
Model ADH
-
.004 to .0045
inch
Model AE
-
.004
to
.0045
inch
Model AEH
-
.004 to .0045 inch
Model AEHS
-
.0065 to .007
inch
Model AFH -
.0045 to .005 inch
Model AGH
-
.0055 to .006 inch
Model AHH
-
.0055
to
.006
inch
Piston ring
side
clearance in
grooves is
.002 to
.003
inch.
Fig.
23
77514C
17
Fig,
24
71
152C
Piston
ring gap width is .012
to
.
022 inch.
Piston pin clearance in bushing
.0005 to
.
001
inch.
Connecting
r
od to c rankpin clearance
.0007 to .002
inch.
Connecting rod side
clearance on crankpin
.
004 to
.010 inch.
Rings should be reassembled to the piston as
shown
in
Fig.
24. On Model ADH the piston
is fitted
with
two compression and
one oil
regulating
ring.
The
AEHS engine has two
compression
rings in the
top
two grooves, one
scraper
ring in
the
third groove and
one oil regulating ring in the fourth groove. Models
AE, AEH,
AFH,
AGH
and
AHH have three
compress-
ions and one oil regulating ring each
.
The scraper and
oil
rings must be assembled to the
piston with the
scraper edges down, otherwise oil
pumping will
result.
See
Fig.
25.
UPPER END OF PISTON
.........----~'---
Fig.
25
14
178SC·
1
Ml·222
..
4
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