Cylinder Block/Head; Valve Clearance; Adjusting The Valve Clearance - Doosan DP158LCF Operation & Maintenance Manual

4. Regular inspection

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

1
5
6
7
8
8 Cylinder engine
2
3
DV2213041A
1
2
8
7
6
3
5
4
3
2
4
1
DV2213042A
10
10
11
12
12 Cylinder engine
1. Rotate the crankshaft so that #1. cylinder may be
positioned 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
valve stem.
4. Adjust the clearance screw respectively and then
tighten with the lock nut.
5. As for the valve clearance, adjust it when in cold, as
follows.
64
6
1
7
2
8
10
3
9
8
7
9
6
4
5
4
3
2
5
1
10 Cylinder engine
DV2213213A
7
1
8
2
9
12
3
11
10
9
4
8
7
6
5
5
4
3
2
6
1
DV2213043A