Komatsu 170-3 Series, Руководство по ремонту, Страница: 136 / 454

12-10
170-3 SERIES
TESTING AND ADJUSTING
ADJUSTING INJECTOR SET
LOAD
1. Remove the cover of the flywheel housing, then
install barring device G1.
2. Remove the cylinder head cover.
3. Using barring device G1, rotate the crankshaft in
the normal direction to set No. 1 cylinder at com-
pression top dead center, and align pointer b
with the [1.6TOP] line a on the crankshaft pulley.
★
Watch the movement of the rocker arm and
check that the No. 1 cylinder is at the com-
pression stroke. (If the rocker arms for both
the intake and exhaust sides move only the
amount of the valve clearance, the cylinder is
at the compression stroke.)
★
The cylinder where at compression top is dif-
ferent from the cylinder where the injector is
being adjusted, so check the table below
when carrying out the operation.
★
Cylinder at compression top and cylinder for
adjustment of injector:
4. Loosen lock nut (2), then fully loosen adjustment
screw (1) of the injector to be adjusted, then
tighten it by hand.
★
Check that the socket at the tip of the rocker
arm and the ball of the push rod are both fit-
ted securely into the injector and push rod,
respectively.
5. Tighten adjustment screw (1), repeat the loosen-
ing operation, then tighten finally.
Adjustment screw:
1st time : 29.4 – 34.3 Nm {3.0 – 3.5 kgm}
2nd time : Loosen fully
3rd time : 29.4 – 34.3 Nm {3.0 – 3.5 kgm}
4th time : Loosen fully
5th time : 29.4 – 34.3 Nm {3.0 – 3.5 kgm}
Compression top
1 5 3 6 2 4
Injector to adjust
2 4 1 5 3 6
6. Hold adjustment screw (1) in position, then
tighten locknut (2).
Locknut: 205.8 – 245 Nm {21 – 25 kgm}
7. After completing the adjustment, set to the origi-
nal position.
Cylinder head mounting bolt :
9.8
±
1.0 Nm {1
±
0.1 kgm}
➅
ADJUSTING INJECTOR SET LOAD
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