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Cat Man
Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
Satisfied Customers: 8960
Experience:  23 Years Caterpillar Engine experience.
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how to adjust injectors on a C12 cat engine with a engine number

This answer was rated:

how to adjust injectors on a C12 cat engine with a engine number of 2ks63205

HI. thanks for using JA! I will try and help you out.

First you will need to put the engine on top dead center. This is done by rotating the engine clockwise from the front and then inserting a bolt into the front right side of the rear cover as seen below at # XXXXX

 

graphic

At this time, your engine will be on TDC.

 

Then follow the procedure in order to adjust your electronic unit injectors:

  1. Put the No. 1 piston at the top center position on the compression stroke. Cylinders 3, 5, and 6 can be adjusted with cylinder 1 at Top Center compression stroke.
  2. Loosen the locknut.
  3. Turn the adjustment screw until the screw makes contact with the electronic unit injector.
  4. Tighten the adjustment screw to an additional 2 turns.
  5. Turn the adjustment screw counterclockwise for 2.5 turns.
  6. Turn the adjustment screw until the screw makes contact with the electronic unit injector.
  7. Turn the adjustment screw through 180 degrees in a clockwise direction.
  8. Tighten the locknut to a torque of 55 ± 10 N·m (41 ± 7 lb ft).
  9. Rotate the engine in the normal operating direction by 360 degrees. Cylinder 1 will now be on Top Center exhaust stroke.
    1. Cylinder 1, 2, and 4 can be adjusted with cylinder 1 at Top Center exhaust stroke.

    2. Loosen the locknut.

    3. Turn the adjustment screw until the screw makes contact with the electronic unit injector.

    4. Turn the adjustment screw to an additional two turns.

    5. Turn the adjustment screw counterclockwise for 2.5 turns.

    6. Turn the adjustment screw until the screw makes contact with the electronic unit injector.

    7. Turn the adjustment screw through 180 degrees in a clockwise direction.

8. Tighten the locknut to a torque of 55 ± 10 N·m (41 ± 7 lb ft).

 

 

Please let me know if you have any more questions.

 

 

 

 

 

Customer: replied 7 years ago.
so do you adjust intake valves 1,2,4 and Exhaust Valves 1,3,5 on top dead center #1 compression stroke while you adjust the injectors 3,5,6

Yes and then when you adjust intake valves 3, 5, 6 and Exhaust valves 2,4,6 on TDC compression #6 you adjust injectors 1,2,4.

Here is a valve sheet in case you need it.

 

graphic

 

Please let me know if you have any more questions.

Cat Man and 2 other Heavy Equipment Specialists are ready to help you
Customer: replied 7 years ago.
have you ever seen a block failure to were oil gets into the antifeeze on a C12 i checked the cooler did not apear to leak and pulled the head did not see no signs of head gasket failure plus looks as if someone has replaced the head already

Actually I have only seen this one time. It is very rare for this to happen.

 

Please let me know if you have any more questions. I am glad to help.

 

Thanks for the bonus and accept!



Edited by Cat Man on 8/26/2010 at 5:50 PM EST