Group 21 Reconditioning engine
Cleaning, inspection
te
26
e77
Check piston ring gap
Insert
pislon
ring
in bore (use an inverte<:! piston
to
ensure that ring takes
up
correct position.)
Measure gap 15
mm
(0.6 in)
from
lower
edge. using a
feeler gauge.
Upper compression ring
.....
.
.
...
0.35-n.65
mm
(0.01 4
-0.026
in)
Lower compression ring
................
0.35-0.55
mm
(0.014-0.022
in)
Oil scraper ring. . . . .
.....
0.25-0.60
mm
(0.010-0.024 in)
Clean and inspect connecting rods
Check for:
damage
signs
of
wear
- cracks
- damaged threads
Check gudgeon (pistans) pin fit
e72
e73
It should be possible
to
slide pin
through
bore
with
light
thumb
pressure.
e74
Check gudgean (piston) pin
fit
in pistan
Pin
must
not be loose. tt should be possible
to
press pin
through
with
thumb
pressure.
Oversized pins can be used
if
bore is
worn.
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