Westerbeke 20B TWO Tehnical Manual page 48

Piston and Connecting Rod Removal
1. Remove the cylinder head assembly.
2. Remove the oil pan.
3. Remove the oil screen.
4. Chalk the cylinder number on the side face of the big end of each connecting rod to prevent confusion
of connecting rods.
5. Remove the connecting rod cap from each piston
and rod assembly and draw the assembly upward
from the cylinder. Take care not to allow the con-
necting rod to scratch the crankshaft pin and
cylinder. Keep the removed parts (connecting rod,
rod cap, piston etc.) classified by cylinders.
6. Remove the rings from each piston with the piston
ring pliers.
7. Using the piston setting tool, pull out the piston pin
from each piston.
Piston and Connecting Rod Inspection
FRONT
mark (arrow)
Piston
Removing Piston Pin
Pressing
Inspect the removed parts. If any parts are found defective, replace or repair them.
Damage, wear, _ _ {
08----::
and ring gap
~
~~
• Wear, seIzure, and streaks
8
• Clearance between piston and cylinder
tf~. ~
Standard:O.07-0.115mm
- - - - - ~
• Wear of p,ston ring grooves
~
$
Damage and wear
-------V
Inspection of Piston and Connecting Rod
Westerbeke Engines 46
• Bend and twist
- - - • Big end play
Standard: 0.1 -O.35mm
}
• Contact and seizure
- • Flaking and fusion
• Oil clearance
Standard: O.022-0.052mm
® ___ - -
Damage