Volvo Penta D25A MS, Operator'S Manual

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Maintenance: Fuel System
Injection timing inspection
The injection timing is indicated on the caution plate
attached to the No. 1 rocker cover. Check it before
inspection. Bring the piston for No. 1 cylinder to top
dead center on compression stroke as follows:
1. Turn the engine in the normal direction to align
the timing mark [1 .6] on the damper with the
pointer as shown.
2. Remove the No. 1 rocker cover and make sure
the inlet and exhaust valves for No. 1 cylinder
have some clearance. If these valves have no
clearance, turn the engine once again to align the
timing mark [1 .6].
NOTE! Do not confuse the No. 1 cylinder with No. 6.
When the piston for the No. 1 cylinder is in the above-
mentioned position, its inlet and exhaust valve are se-
ated, presenting some clearance.
3. Turn back the engine approximately 60 degrees,
and turn it in the normal direction slowly until the
specified timing (indicated on the caution plate)
aligns with the pointer. To ensure proper injection
timing, make sure that the timing mark on the
coupling flywheel aligns with the pointer on the
fuel injection pump.
Adjust fuel injection timing
1. Make sure the timing mark (indicated on the cau-
tion plate) is aligned with the pointer, with the pis-
ton for the cylinder at top dead center on com-
pression stroke.
2. Loosen two bolts for the fuel injection pump coup-
ling.
3. Turn the coupling flywheel until the timing mark
on the coupling flywheel aligns with the pointer on
the fuel injection pump.
4. Tighten the one nut for fuel injection pump coup-
ling. Turn the engine to tighten the other side nut.
5. Turn the engine (two turns) to recheck the injec-
tion timing for verification.
a. pointer
b. timing mark
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