Firing Order - Volvo Penta D25A MS Operator's Manual

Firing order

Check and adjust the valve clearance in the firing order (injection sequence), turning the engine with each cylin-
der piston at top dead center on compression stroke.
Firing order 1
(Example): After checking and adjusting the cylinder No.1, turn the engine 120° and check and adjust the cylin-
der No.5.
Cylinder No. 1
Timing ( ° ) 0 120 240 360 480 600
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5 3 6 2 4
5 3 6 2 4
Valve clearance inspection
1. Check the valve clearance with feeler gauges in-
serted between the rocker arm and yoke cap.
Valve Clearance:
Inlet valve .................................. 0.6 mm [ 0.024 in.]
Exhaust valve ............................ 0.8 mm [ 0.031 in.]
2. The clearance is correct if feeler gauge is slightly
gripped between the rocker arm and the yoke
cap. If the feeler does not fit into the clearance
exactly, perform adjustments as described below.
IMPORTANT! When performing the "First Ser-
vice", valves that are checked and deemed not
in need of adjustment must be checked again
within 250 hours.
Adjust valve clearance
1. Loosen the lock nut of the adjusting screw.
2. Turn in or back off the adjusting screw so that
feeler gauge is slightly gripped between the rock-
er arm and yoke cap.
3. After adjusting the clearance, tighten the lock nut
of the adjusting screw.
Maintenance: Engine
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