Doosan DP158LDF - Cylinder Head and Valve Adjustments

4. Regular inspection
64
Cylinder block/head
Valve Clearance
Adjust the valve clearance.
• When disassembling the engine or cylinder head.
• When there is excessive noise in the valve connec-
tion.
• When the engine runs abnormally even if the fuel
injection system is normal.
Adjusting the Valve Clearance
DV2213041A
DV2213042A
DV2213213A
DV2213043A
1. Rotate the crankshaft so that #1. cylinder may be
posi
tioned at the compression TDC(Top Dead Center).
Note) #1. Cylinder is located at the side where cooling
water pump was installed.
Note) In case of 8/12 cylinder engine, #6. cylinder is posi-
tioned at the valve overlap when #1. cylinder is
positioned at the compression TDC(Top Dead
Center).
Note) In case of 10 cylinder engine, #7. cylinder is posi-
tioned at the valve overlap when #1. cylinder is
positoned at the compression TDC(Top Dead
center).
2. Loosen the lock nut of the #1. cylinder rocker arm.
3. Push the feeler gauge between a rocker arm
and a
val
ve stem.
4. Adjust the clearance screw respectively and t
hen
t
ighten with the lock nut.
5. As for the valve clearance, adjust it when in cold, as
follows.
1
2
3
5
6
7
8
1
2
3
4
8
7
6
5
4
3
2
1
8 Cylinder engine
6
7
8
9
10
1
2
3
4
5
10
9
8
7
6
5
4
3
2
1
10 Cylinder engine
7
8
9
10
11
12
1
2
3
4
5
6
12
11
10
9
8
7
6
5
4
3
2
1
12 Cylinder engine