Doosan 50001, Shop Manual

Page: 372 / 898

SP001693 Engine
Page 192
• EXAMPLE: If the distance between the two "longer"
marks is approximately 2.0 cm and the distance from
the TDC mark is approximately 4.0 cm, the answer is
approximately 2. This indicates there is 10° (2 x 5°)
between the TDC mark and the first "longer" mark on
the timing grid. That means the first "longer" mark on
the timing grid indicates 10° BTDC, the second
"longer" mark indicates 15° BTDC and the third
timing mark indicates 20° BTDC. If the answer is 3,
that indicates there is 15° (3 x 15°) between the TDC
mark and the first "longer" mark and that the first
"longer" mark indicates 15° BTDC with the second
and third "longer" marks indicating 20° BTDC and
25° BTDC respectively.
8. Highlight the timing reference mark (2, Figure 283) on the
flywheel housing or engine back plate (2, Figure 284).
Highlight the TDC (Top Dead Center) mark (1, Figure 283)
on the flywheel.
9. Highlight the target timing mark (1, Figure 284) on the
flywheel as calculated in Determining the Fuel Injection
Timing Specification on page 7-26.
10. Rotate the crankshaft counter-clockwise until the dial
indicator shows that the injection pump plunger is at the
bottom of its stroke. Rock the crankshaft back and forth
slightly to confirm a point where the dial indicator shows
no movement. Zero the dial indicator.
11. Slowly rotate the crankshaft clockwise until the dial indicator
shows a pump plunger lift of 2.5 mm (0.098 in.).
12. Check the position of the flywheel target timing mark
(previously determined) (1, Figure 284) in relation to the
timing reference mark (2, Figure 284) on the flywheel
housing or engine back plate. If the two marks are aligned,
the fuel injection timing is correct. If the marks do not align,
the fuel injection timing must be adjusted. See “Adjusting
Fuel Injection Timing” on page -193
13. If the injection timing is correct, remove the dial indicator
and adapter. Replace the pump plunger plug and its
copper gasket and tighten to specifications. Replace the
flywheel inspection port cover. Open the fuel supply valve
and remove the clamp from the fuel supply hose and the
fuel return hose.
14. Prime the fuel system. Operate the engine and check for
leaks.
Figure 283
Figure 284