Injection Timing - Westerbeke 55B-FOUR Service Manual

ENGINE ADJUSTMENTS
. INJECTION TIMING
Take care to avoid entry of dust or foreign particles into
the pump interior when the timing adjustment is made.
1. Remove the injection pipe of the No.1 cylinder.
2. Remove the delivery valve holder of the injection
pump of the No. 1 cylinder, and then pull out the
delivery spring.
3. With the spring left removed, install the delivery
valve holder.
oelivery valve
holder
\
,,/
Injection pump
4. Slowly tum the crankshaft pulley clockwise, at the
same time, continue to feed the fuel.
When the fuel stop flowing out from the No.1 deliv·
ery valve holder, stop turning the crankshaft.
This crank angle position is the starting point of
injection.
5. In the condition at Step (4) above, confirm what
degree the "groove mark" of the crank pulley is at,
when seen by the "timing mark", provided in the
timing gear case.
When the value is out of the range of the normal
injection timhg, adjust it accordingly.
Injection timing
I
BTDC 16·
Note:
The injection timing varies according to the specifica·
tions of the machine.
6. Adjust the injection timing with a shim between the
injection pump and the cylinder block.
Shim is available in the following 9 types, and "iden·
tification mark" is stamped (or imprinted) on the top
face.
Identification mark of shim and its thickness (mm)
Mark Thickness Mark Thickness Mark Thickness
2 0.2 5
0.5
8 0.8
3 0.3 6
0.6
10
1.0
4 0.4 7 0.7 12 1.2
Note:
For each of the injection pumps of three cylinders, the
shim adjustment is made at the same time.
When a shim is missing while overhauling the engine
and the shim thickness is unknown, assemble the
engine with provisional shim inserted. After assembling
the engine, check the injection timing and adjust the
shim until the normal injection timing is obtained.
Reference:
To add the 0.1 mm shim thickness corresponds to the 1
degree of crankshaft angle advance.
Injection pump
Cylinder block
Engines & Generators
52