Westerbeke Universal M-50 - Checking Flatness of Cylinder Head Surface; Removing Water Pump

REMOVING WATER PUMP
1. Remove the water pump from gear case cover.
2. Remove the fan and fan pulley.
IMPORTANT:
If changing the water pump, change the whole pump. If disassembling the
water pump,
check to see the clearance between the water pump impeller and body.
Water pump assembly
1. Water Pump Impeller
2. Seal Set
3. Water Pump Body
4. Bearing
CHECKING FLATNESS OF CYLINDER HEAD SURFACE (See illustration on page 107)
1. Clean the surface of the cylinder head.
2. Place a straight edge on each of the cylinder heads's four sides and two diagonally as shown
at the
left to check the straightness of the surface.
3. Insert a feeler gauge between the straight edge and the cylinder head surface.
4. The maximum thickness that can be inserted is the amount of flatness.
5. If the measurement exceeds the allowable limit, correct with a surface grinder.
IMPORTANT: Do not place the straight edge on the combustion chamber.
Allowable limit
0.05 mm (0.002 in.) per 100 mm (4 in.)
of cylinder head surface length.
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