Westerbeke 50 - Page 35

d Tighten the oil seal retainer bolts
to 20 Ibf ft (2.8 kgf m, 27 Nm).
e
Tighten the flywheel bolts to 40
Ibf ft (5.5 kgf m, 54 Nm).
67 Fit the engine.
DATA
Camshaft bearing inside diameters (reamed
in position):
Front .................... .
Centre ................... .
Rear
..................... .
Crankshaft end-float ........ .
Thrust washer thicknesses ..•...•....
CONNECfING RODS AND
PISTONS
Remove and refit
Service
tool: 18G 55 A
Removing
I NA
2 Drain the sump.
3 Drain the cooling system.
12.17.01
4 Remove the cylinder head gasket, see
12.29.02.
5 Disconnect the oil cooler pipe from
the L.H. side of the crankcase.
6 Release
the oil cooler pipe clip from
the gearbox mounting plate and move
the oil pipe aside.
7 Remove
the sump.
8 Remove the big-end nuts.
9 Remove
the big-end caps and bearing
halves.
10 Withdraw the connecting rod and
piston assemblies.
II Mark the pistons and connecting rods
for reassembly.
12 Remove
the circlips and the gudgeon
pins
and separate the pistons from the
connecting rods.
68 Run the engine for a minimum of
I 5 mins and on return
slacken the cylinder head nuts
approximately t of a turn in the
sequence shown before retightening
them to 75 Ibf ft (10.4 kgf m, 102
Nm) in the sequence shown. Check
the valve rocker clearances.
1.79025 to 1.79075 in (45.47 to 45.48 mm)
1.73025 to 1.73075 in (43.95 to 43.96 mm)
1.62425 to 1.62475 in (40.26 to 40.27 mm)
0.001 to 0.0055 in (0.03 to 0.14 mm)
0.0885 to 0.0905 in (2.25 to 2.30 mm),
0.091 to 0.093 in (2.31 to 2.36 mm) and
0.0935 to 0.0955 in (2.37 to 2.43 mm)
12
13a
~
13a
4NC09lA
Refitting
13 Reverse the procedure in 8 to 12,
noting:
a Assemble
the pistons to the
connecting rods with the
combustion cavities on the oil
hole side
of the connecting rods.
b
If new piston rings are being used
ensure
that the ring gaps are
correct, see 12.17.10.
c Use tool 18G 55 A to compress
the piston rings.
d
Fit the connecting rod and piston
assemblies with the combustion
cavities on the R.H. side of the
engine.
14
If the connecting rods or piston(s)
have
been renewed, rotate the
crankshaft and measure the amount
by which each piston stands proud of
the cylinder block face at T.D.C.
IS
If piston stand-proud is outside the
limits given in DATA, fit suitable
alternative piston(s) from
the range
available.
NOTE:
It is not necessary for the
pistons in an engine to be of the same
height grade.
16
Tighten the big-end nuts to 35 Ibf ft
(4.8 kgf m, 47 Nm).
17 Reverse
the procedure in I to 7.
DATA
Piston stand-proud
0.013 to 0.021 in (0.33 to 0.53 mm)
l:-
eo