Page FUEL SYSTEM - 36
Z001019/0_7_July 2012
03 FUEL SYSTEM
SERVICE MANUAL MARINE ENGINES
03.14.02
Disengagement methode of injection
NOTE:
Disengagement methode of injection
is a simple and effective method to detect defective
unit injectors with regard to formation of bubbles in
both the fuel system and the engine cooling system
or lack of power it related to deficiencies in injection
equipment.
Preparation: Remove camshaft housing cover
refer 01.00.02
Special tool: 4 cyl. engines VR00133/1
6 cyl. engines with bossed seal surface
VR00133/0
6 cyl. engines with plane seal surface
VR00133/2
1 Mount special tool No. VR00133/.(see list special
tool) to disconnect injection.
2
Start the engine, let it run in idle and check if bubbles
form.
NOTE:
If there are no bubbles at idle speed
of engine, continue with item 3.
3
bring engine to operating temperature and then test
the boat under operating conditions and watch for
bubbles to form.
Keeping this operating condition, continue with item 4.
4
Loosen nut on cover (ill .1/pos.1), screw in, with
fast turns, screw (ill.1/pos.2) until knocking noise
disappears. Tighten nut (ill.1/pos.1) again. As a re-
sult, unit injector is pressed down to such an extent
that injector cam can no more touch the rocker arm,
thus preventing the injection of fuel. (respectively
eliminating combustion)
5
Test the boat with disengaged unit injector under
operating conditions and observe the returning fuel
if bubbles still appear.
6
Continue to check all other injectors (cylinders) in
order to detect the defective(s) unit injector(s).
NOTE:
bubble formation will change and/or
stop as soon as injection of defective
unit injector(s) is disengaged.
7
Replace defective unit injector(s).
(Replace unit injector, refer to 03.02.02)
14.02 ill.1
2
1
