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Adjustments and Benchtesting
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 60° and check and adjust the cylinder
No. 12.
Cylinder No.
1
Timing ( ° )
0
52
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9
6
14
2
10
9
6
14
2
10
60
90 150 180 240 270 330 360 420 450 510 540 600 630 690
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.
Adjust valve clearance
1. Loosen the lock nut of the adjusting screw.
2. Turn the adjusting screw in either direction until
the feeler gauge is slightly gripped between the
rocker arm and yoke cap.
3. After adjusting the clearance, tighten the lock nut
of the adjusting screw.
4
12
8
16
3
4
12
8
16
3
11
7
15
5
13
11
7
15
5
13
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