Inspection
of
piston ring gaps. Put each piston ring
into the cylinder bore and push the ring with the piston
to
position the ring on square with the cylinder wall.
Measure the ring gap with a feeler gauge. If the meas-
urement exceeds the service limit, replace that piston
ring.
CAUTION
When only the replacement
of
rings is
to
be
made, without reboring (honing)
of
the cylinder,
position the ring
to
be measured at the least worn
place
of
the cylinder skirt. Install the new rings
having the same size as the piston. Piston rings
available
for
servicing are sized into three clas-
ses:
STD,
0.25
OS,
and 0.50 OS.
Inspection
of
ring groove in piston. Measure the side
clearance for each piston ring set in the ring groove in
the piston.
If the service limit is exceeded, replace the
ring with a new one.
Piston and Connecting Rod Installation
When reassembling the piston and connecting rod and
installing the piston and rod assemblies in the cylinder
block, pay attention
to
the following.
1.
Reassemble the piston and connecting rod, using
the Piston Pin
Setting Tool,
by
pressing the piston
pin in
to
the set position.
Description
Pin
press·fitting force
(at
a normal temperature)
Standard
1000±500kg
47
Piston
o
Cylinder
Ring
Ring
gaps
Measuring
Ring
Gap
Ring Standard Service
limit
All rings
0.15-0.40
1.5
Measuring
Ring
Side
Clearance
Ring Standard Service
limit
No. I
-
0.3
No.2
0.05-0.09
0.2
Oil
0.03-0.07
0.2
Note
:
No.
I ring
is
of the semi·key
stone
type.
FRONT
mark
(arrow)
Piston
Pressing
Installation
of
Piston
and
Connecting
Rod
Westerbeke Engines
To Next Page
Loading...
Need help?
General
