34
5.7.9 Arrangement of cylinder head and valve
WP12 series marine diesel engine is designed with individual head assembly for each cylin-
der.
Each cylinder head is designed with two valves; one for inlet and the other for exhaust.
The valve arrangement from the front end is as per gure 5.15 (I- Inlet & E- Exhaust)
I
1
2
3
4
5 6
E I E I E I E I E I E
Figure 5.15
5.7.10 Adjustment of valve clearance
Correct valve clearance is one of the main factors to balance power
adjustment of engine. Valve clearance must be performed by a
trained Professional.
Firing Order: 1-5-3-6-2-4
Valve clearance: Inlet valve: 0.40mm. Exhaust valve: 0.60 mm
Valve clearance should be adjusted on cold engine
(the engine body temperature must be lower than 50°C).
Clean the engine’s outer surface – rocker cover and surrounding area. Loosen the
rocker cover bolt and remove the cover (Refer gure 5.16,5.17 &5.18). Clean the
rocker arm with a clean non-appy cloth.
Figure 5.16 Figure 5.17
Figure 5.18
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