Doosan DP158L Series, Руководство по эксплуатации и техническому обслуживанию

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4. Regular inspection
63
• 8 cylinder engine(DP158L)
• 10 cyliner engine(DP180L)
• 12cyliner engine(DP222L)
Tightening Cylinder Head Bolt
1. Retightening cylinder head bodt on new engine.
DV2213044A_E
1) The cylinder heads are mounted with cylinder head bolts
which are tightened by the angle-ofrotation method.
2) On new engines the cylinder head bolts are tightened up
for the first time at the factory after the engine has been
broken in.
3) After the first 400 hours of operation retighten cylinder
head bolts 1 to 4 in the order shown in right figure by a
further 90°(1/4 revolution).
2. Tightening cylinder head bolts after a repair. (Engine
cold)
DV2213045A_E
1) Tighten temporarily 1~2 threads by hands.
2) 1st step: Tighten to about 8kgf•m with a wrench.
3) 2nd step: Tighten to about 15kgf•m with a wrench.
4) 3rd step: Rotate 90° with a wrench.
5) Final step: Rotate 90° with a wrench.
6) After the first 10 to 20 hours of operation after a repair
turn the cylinder head bolts by a further 90°(1/4 revolu-
tion).
Valve overlap cylinder No.
1 5 7 2 6 3 4 8
6 3 4 8 1 5 7 2
Adjusting valve cylinder No. (In./Ex. Valve)
Valve overlap cylinder No.
1 6 5 10 2 7 3 8 4 9
7 3 8 4 9 1 6 5 10 2
Adjusting valve cylinder No. (In./Ex. Valve)
Valve overlap cylinder No.
1 12 5 8 3 10 6 7 2 11 4 9
6 7 2 11 4 9 1 12 5 8 3 10
Adjusting valve cylinder No. (In./Ex. Valve)
1
Intake si d e injector
Exhaust si d e
4
3
2
CAUTION
• The two outer screws (intake and exhaust sides)
must not be retightened.
• The cylinder head bolts to be retightened must not
be loosened first, but simply tightened by a further
90°(1/4 revolution) from their actual position.
CAUTION
• If excessive torque may damage the cylinder head
gasket, cylinder liner flange and cylinder head bolt,
so keep the specified torque.
• When tightening cylinder head bolts after a repair
must always adjust the valve clearance.
CAUTION
The cylinder head bolts to be retightened must not
bolts loosened first, but simply tightened by a further
90°(1/4 revolution) from their actual position.
1
Intake si d e injector
Exhaust si d e
4
3
5
6
2