Westerbeke 8.0KW-60Hz Service Manual page 30

ENGINE-DISASSEMBLY, INSPECTION AND ASSEMBLY
CRANKSHAFT PIN OIL CLEARANCE
(PLASTIC GAUGE METHOD)
1. Wipe all the oil off the crankshaft pin and the
connecting rod bearing.
2. On the pin, place a plastic gauge that is cut to the same
length as the bearings width. The plastic gauge must be
centered on the pin in parallel with the pins axis.
3. Gently place the connecting rod cap in position and
tighten the bolts to the specified torque.
4. Remove the bolts and gently remove the connecting rod
cap.
S. Measure the compressed
part
of the plastic gauge at its
widest point using the scale printed on the plastic gauge.
STANDARD VALUE 0.02 - 0.04mm (.000788 - .0015In)
LIMIT O.lmm (.0039in)
c .
PISTON
PIN
CONNECTING ROD: : }
'1
PISTON PIN INSTALLATION
1. Measure the following lengths (as shown):
A
A: Piston boss-to-piston boss outside dimension.
B: Piston boss-to-piston boss inside dimension
C: Piston pin length.
D: Connecting rod small end eye tltickness.
2. Enter the measured values into the following formula:
l=A-C- B-D
2
3. Insert the Push Rod (special tool) into the piston pin, then
fit gnide A (special tool) as shown.
4. Fit the piston and connecting rod together such that their
front marks are on the same side.
S. Apply engine oil to the outside of the piston pin.
6. Into the front-mark side of the piston, insert the gnideA,
piston pin, and Push'Rod, starting with gnideA.
7. Screw guide B into guide A. Leave a gap between the
two guides of 3mm plus the value (L) calculated in step 2.
3MM+L
8. Mount the piston and connecting rod on the Piston Pin
Setting Base (special tool) with the pistons front mark
pointing upward.
9. Install the piston pin using a press. If the press-fitting load
is out of specification, replace the piston pin and piston
assembly or the connecting rod, or both.
STANDARD VALUE 4,900 -14,700 Nm (36,162 -10,848 "-lb.)
PUSHKN08~
PIN
MARK
GUIDE
A---"
GUIDE 8
PISTON RINGS INSTALLATION
1. Fit the oil ring spacer into the piston groove. Then,
assemble the upper and lower side rails.
2. The spacer and side rails may be fitted in either direction.
No distinction is made between top and bottom. The
spacer and the side rails sizes are color coded as follows:
SIZE COLOR
sm
O.50mm oversize
1.00mm oversize
None
81ue
Yellow
Engines & Generators
23