Timing Gear/Camshaft; Removing The Timing Gears; Timing Gear Inspection; Valve Camshaft Removal - Westerbeke 12C-TWO Operator's Manual

TIMING GEAR
I
CAMSHAFT
REMOVING THE TIMING GEARS
1. Remove the snap ring and disassemble the idler gear.
2. Remove the valve camshaft and the injection pump
camshaft on which the gears are press-fitted, remove the
gears.
3. Remove the crankshaft. Remove the crankshaft gear.
-
.-
Timing Gear Inspection
TIMING
GEAR
CASE
Inspect all gear teelli tor wear and
damage. If any gear is defective,
replace the gear.
Carefully inspect the gears, gear teeth and gear bushings.
Check the clearance between the idler gear bushing and its
shaft.
Idler Gear Bushing Clearance
standard 0.03- 0.07mm (0.001 - 0.010in)
Limit 0.2mm (O.OOSin)
When assembled, check the backlash between the two gears
in mesh. Idler gear to crankshaft, injection pump
to
idler, and
camshaft to idler.
Backlash Between Gears
Standard 0.01 • 0.14mm (0.0003- 0.005in)
0.3mm (0.012in)
15
Installation
Press-fit the crankshaft gear onto the crankshaft.
Press-fit the valve camshaft gear and the ignition pump
camshaft gear onto their respective shafts.
Install the gear assemblies in the following sequence.
1. Turn the crankshaft to set the #1 cylinder
to
T.D.C. On
the compression stroke.
2. Install the valve camshaft and injection pump camshaft.
3. Install the idler gear so that the timing marks on it are
aligned with the marks on the other gears.
4. Check that the timing gears are all in alignment.
GEAR
TIMING
MARKS
VALVE CAMSHAFT REMOVAL
If
only the camshaft is being removed, use the following pro-
cedure:
1. Dismount the cylinder head assembly.
2. Pull out the push rods.
3. Pull out the tappets.
4.
Remove the gear case assembly.
5. Remove the camshaft stopper bolt.
6.
Draw out the camshaft assembly.
INJECTION PUMP CAMSHAFT REMOVAL
1. Disconnect the injection pumps.
2. Remove the injection pump assembly.
3. Remove the gear case.
4. Remove the shaft rear cover.
5. Pull the shaft out to the front side.
.INJECTION
PUMP
CAMSHAFT