Question for injector pump gurus.

[NeedMoPower]

I have recently found a problem with an injector pump that I have... .

The aneroid pin that rides against the tapered cam has become stuck and will not ride against the cam anymore. I have soaked the pin with brake cleaner, but I can't seem to free the pin.

I am sure that some of you guys have had this problem with this pin getting stuck, and I am curious as to how you fixed the problem.

Thanks,

Cody

 

[Power Wagon]

You're not going to like my answer.



They stick when they get rusty. Basically, you have rust in either the fuel area of the pump, or in the 'boost' side of the chamber, caused by condensation from the air.



The real fix is to take the pump apart, replace the bad parts, put it back together, tune it up RIGHT on the test stand, and put it back on.



I told you wouldn't like my answer. But, I suspect you've got a lot of miles, or have lived in an area that has immense dampness either constantly, or routinely. There are preventative things you can do, but it's too late for them. One is to pull the lid off the aneroid and put penetrating oil in regularly down where hte plunger goes.



But, like I said, it's too late for that



Just my best guess.

 

[NeedMoPower]

Thanks for posting power wagon... I was hoping you would.

The good news is the pump isnt on the truck. It is a spare pump that I have been playing around with. Well I will look at it some more and see what parts need to be replaced.

Thanks,

Cody

 

[BushWakr - RIP]

This was a commonly posted question some time back. I first read about it in the "archives" when I first joined TDR. PW's answer turned out to be dead on in almost every case.



Bob.

 

[Steve Graham]

A cheep fix!

I fixed this same problem on my 4Bt with out any incured cost! There is a plug on the front side where the pin is installed, use the approtate size allen head and remove the plug. On the 6B some of the throttle linkage may get in the way and may need to be removed but on the 4B's its not a problem. I ended up setting the diaphram in and pushing in the stuck pin and feeling for the low spot for most fuel. Assembled the diaphram cover and then replaced the plug for the pin. I belive that the problem is the lateral forces on the pin wear the housing so that the pin can become stuck. I posted this fix on the "Cummins Conversions page too.



STeve



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