Multiquip DCA-60SS12 operation manual Valve Clearance Check, Injection Timing Check and Adjustment

DCA-60SSIU — MAINTENANCE

Valve Clearance Check

1.In order to bring No. 1 or No. 4 cylinder to top dead center in the compression stroke, align the notched line on the crank pulley with TDC mark on the timing gear case cover.

2.Do the adjustment on the circle marked valves in the below table where No. 1 cylinder is at the center in the compression stroke.

3.After adjustment started from either piston top center, turn the crankshaft 360o to align the notched line with the TDC mark to do the adjustment again on the remaining valve. See Table 16 and Figure 55 for valve arrangement.

Injection Timing Check and Adjustment

1.Bring No. cylinder to the top dead center on the compression stroke.

2.Turn the crankshaft pulley clockwise (viewed at engine front) and align the notched line on the crank pulley with the TDC mark on the timing gear case cover.

Figure 58. Valve Adjustment

NOTE:

Take necessary precautions to prevent dust and foreign particles in the pump interior when timing adjustments are made.

3.Remove the timing check hole cover at the front of injection pump to check the alignment between the pointer “a” on the injection pump gear lock plate and the projected area mark “b” on the timing gear case.

4.If “a” and “b” are in alignment, the timing is set correctly. If not, follow nos. 1-3 until the “a” and “b” are aligned.

5.Reversely turn the crankshaft pulley counterclockwise viewed at the engine front about 30o crank angle.

6.Remove No. 1 injection pipe from the engine.

7.Remove the injection pump No. 1 delivery valve holder, delivery valve and spring and reinstall the delivery valve holder on the original place.

8.Delivery valve holder tightening torque: 39~44Nm(29~33lbft.)

9.Slowly turn the crankshaft pulley clockwise and at the same time continue to feed the fuel with pumping the Feed pump. When the fuel stop to flow out from No. 1 delivery valve holder, stop pumping.

10.Observe and make sure which mark (injection starting angle line) on the timing gear case cover is aligning with the notched line on the crank pulley.

11.The timing line shows the injection starting crank angle of the engine.

12.The injection starting crank angle should be at the 14o timing mark.

Table 15. Valve Adustment

(I=Inlet; E=Exhaust)

Cylinder No.

1

2

3

4

Valve Arrangement

I

E

I

E

I

E

I

E

When No. 1 is at top

X

X

X

X

dead center in the

compression stoke

When No. 4 is at top

O

O

O

O

dead center in the

compression stroke

PAGE 54 — DCA-60SSI2 — PARTS AND OPERATION MANUAL — REV. #3 (09/15/01)