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Cummins N855 engine specifications and manuals - amp

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Cummins N855 injector and valve settings

Tune up information for owners and repairers of Cummins N855 engines - amp

 
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OBC (Outer Base Circle) Method for setting valves and injectors when standard PTD injectors are fitted

 

Loosen all valves and injectors so that the engine turns freely while keeping the push rods in place. Loosen all valves and injectors so that the engine turns freely while keeping the push rods in place.

Rotate engine clockwise until the "A, OR 1-6 VS" timing mark on the accessory drive pulley is aligned with the timing indicator on the front gear case, as shown in the illustration. Set the injector and valves on cylinder #1 or #6 as required.

Mark the rockers of the set valves and injector with a white pen to keep tabs on what you've done.

Rotate the engine to the next timing mark and set the appropriate valves and injector, proceed until all valves and injectors are set. Two engine revolutions are required to set all the valves and injectors.


Setting Cummins NTC 855 Big Cam top-stop injectors

 


Use the IBC (inner base circle) method to set NTC,s when top-stop injectors are fitted. Essentially this means that the setting points, setting order and setting values for the valves and injectors are different from the OBC method described above, but you still use the marks on the accessory drive pulley and the gear case for orientation.

Note: the very low injector torque might require a special torque wrench to achieve. Do not exceed the torque. You should be able to just rotate the pin, rocker to injector, with your fingers after torquing the injector.

* N.B. If you have not got a torque wrench, the 0.7 Nm torque is very little, only about a quarter screw turn more than from finger tight.

Loosen all valves and injectors so that the engine turns freely while keeping the push rods in place.


Rotate engine clockwise until the "A, OR 1-6 VS" timing mark on the accessory drive pulley is aligned with the timing indicator on the front gear case, as shown in the illustration. Set the injector and valves on cylinder # according to the table below.
Mark the rockers of the set valves and injector with a white pen to keep tabs on what you've done.
Rotate the engine to the next timing mark and set the appropriate valves and injector, proceed until all valves and injectors are set. Two engine revolutions are required to set all the valves and injectors.



Cummins N855
Top Stop Injectors
common settings

Torque Injectors
* 0.7 Nm, 6.0 inch.lb

Inlet valves, cold
0.28 mm, 0.011 inch

Exhaust valves, cold
0.58 mm, 0.023 inch

* N.B. If you have not got a torque 
wrench, the 0.7 Nm torque is very 
little, only about a quarter screw 
turn more than from finger tight.

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Cummins N855
Timing Mark on A

When Valves on #5 are closed
Set Valves #5
Set Injector #3

Timing Mark on A
When Valves on #2 are closed
Set Valves #2
Set Injector #4

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Cummins N855
Timing Mark on B

When Valves on #3 are closed
Set Valves #3
Set Injector #6

Timing Mark on B
When Valves on #4 are closed
Set Valves #4
Set Injector #1

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Cummins N855
Timing Mark on C

When Valves on #6 are closed
Set Valves #6
Set Injector #2

Timing Mark on C
When Valves on #1 are closed
Set Valves #1
Set Injector #5

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