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deciencies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
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