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P pump - Conflicting timing specs information throughout diesel forums on the net.

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P pump - Conflicting timing specs information throughout diesel forums on the net.

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Old 04-10-2019, 03:15 PM
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Default P pump - Conflicting timing specs information throughout diesel forums on the net.

Could someone chime in and explain p7100 timing?
Incorrect information is posted on different sites concerning (specifically) how much movement on dial gauge, when inserted and is stationary in the #1 delivery valve port, equals a particular degree in timing alteration ............

One guy tells members that (0.1 mm at dial movement equals 1.5 degrees in timing change)
Another tells members that (1.0 mm at dial movement equals .5 degrees in timing change)

Briefly clear up this simple mis-information so no one "throws a wrench in their machine"
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Old 04-20-2019, 01:05 PM
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You need the specific lift measurements for the cam in your particular pump.

There were different cams used in the various versions of the p-7100 used in the Cummins application. Also an aftermarket pump often times has a different cam.

My 13mm p-7100 has a custom ground cam and none of the timing lift charts for stock applications apply.

What model pump pump are you trying to time?
 
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Old 04-20-2019, 04:12 PM
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Default P pump timing

Hey ... Good Easter to ya

160 pump 12.3 degrees factory.
180 pump 14 degrees factory.
Both with matching internals.

Stock cam, 181 delivery valves, #10 plate 3/4 forward-ish, afc 3/4 forward-ish, afc foot modified, diaphragm washer modified, 4k gov springs.

Fueling 215 injectors and nv4500 tranny.
(Ranch trucks pulling horse trailers ... No hot rodding allowed)
 
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Old 04-23-2019, 09:37 PM
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The lift charts are out there for those pumps. Considering the pumps and the mild combos that youíre running, Iíd just time it with a degree wheel or tape on the balancer and wouldnít worry about using the lift charts.

PDD makes a good magnetic degree wheel for exactly this. Cheap and works well.

Pin the pump. Pop the injection pump gear loose. Pull the number one injector and set your dial intocator to read the piston. Then using the drop valve method , find TDC on the compression stroke. At this point, your set to the stock base timing. I donít trust the TDC plunger on the timing case. Too much room for error.

Make a pointer for the balancer. Can be temporary. Through the degree wheel on the balancer set to the base timing number.

Then roll the engine to the desired timing.

Make sure to take out all gear lash.

Then snug the pump gear down.

Torque the nut.

Button it it up and enjoy.

If if you want to throw your dial indicator on the dv, then you can map it out.

But on pretty basic setups, I prefer to time this way. I can do it faster and it tends to yield more consistent results.

If you feel the timing is off after this, then verify your timing by doing the spill port method and working from there. Thatís how we have to do pumps with unknown cams.

We also use pulse adapters for some setups.
 

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