4. Regular inspection
65
6. Rotate the crankshaft. When a cylinder reaches the
c
ompression TDC(Top Dead Center), adjust the valv
e
c
learance of the cylinder.
7. When a cylinder vavle overlap, adjust the valve clear-
ance cylinder of the compression TDC(Top Dead
Center), as follow.
• 8 cylinder engine(DP158L)
• 10 cylinder 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
bol
ts which are tightened by the angle-ofrotation
method.
2) On new engines the cylinder head bolts are tight
ened
up f
or 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 figur
e
by a
further 90°(1/4 revolution).
Engine Model In. valve Ex. valve
DP158L
DP158LCS 0.25mm 0.35mm
DP158LCF 0.25mm 0.35mm
DP158LDS 0.25mm 0.35mm
DP158LDF 0.25mm 0.35mm
DP180L
DP180LBS 0.25mm 0.35mm
DP180LBF 0.25mm 0.35mm
DP180LAS 0.25mm 0.35mm
DP180LAF 0.25mm 0.35mm
DP222L
DP222LAS 0.25mm 0.35mm
DP222LBS 0.25mm 0.35mm
DP222LBF 0.25mm 0.35mm
DP222LCS 0.25mm 0.35mm
DP222LCF 0.25mm 0.35mm
Valve overlap cylinder No.
15726348
63481572
Adjusting valve cylinder No. (In./Ex. Valve)
Valve overlap cylinder No.
16510273849
73849165102
Adjusting valve cylinder No. (In./Ex. Valve)
Valve overlap cylinder No.
1125 8 31067 2 114 9
6721149112583 10
Adjusting valve cylinder No. (In./Ex. Valve)
• 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
f
urther 90°(1/4 revolution) from their actual posi-
tion.
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