Injector pump problem

[Arecibo]

You will likely have to order a new seal by description rather than part number. Easy-peasy if you have a metric caliper. Multiple sources for metric seals, use what works best for you.

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Thanks for the seal link Bob.

 

[Paddy]

Just to understand, if the pump in not lubed by engine oil, fuel can't mix with engine oil? If he has an oil reservoir on his pump, can it also be duel lubed by engine oil system?

 

[Bob Rooks]

Just to understand, if the pump in not lubed by engine oil, fuel can't mix with engine oil?

As long as the injection pump shaft seal remains good, and the injection pump/governor oil remains undiluted.

If he has an oil reservoir on his pump, can it also be duel lubed by engine oil system?

I'm not sure what you mean by dual lubed. The injection pump and governor share the same oil sump.

 

[Paddy]

Bob,

The first question I had was relating fuel getting into the engine oil, engine lubrication system. As you know from my previous thread, my pump oil was being diluted by diesel fuel. I recall you speculated the high pressure side was lap fitted and they can leak in to the injector pump oil. But if the shaft seal is also bad, then fuel leaks into the injector oil sump and then leaks past the shaft seal and then into the engine.

 

[Bob Rooks]

Bob,

The first question I had was relating fuel getting into the engine oil, engine lubrication system. As you know from my previous thread, my pump oil was being diluted by diesel fuel. I recall you speculated the high pressure side was lap fitted and they can leak in to the injector pump oil. But if the shaft seal is also bad, then fuel leaks into the injector oil sump and then leaks past the shaft seal and then into the engine.

That is correct. But the small amout of fuel that gets by the barrel and plungers should only be small trace amounts unless they are worn from dirty fuel or corroded from moisture or diesel bugs. Trace amounts would not pose an immediate threat of engine oil dilution, and only show up on oil analysis reports. That's why injection pump oil should be checked/changed frequently for fuel dilution.
I have a ball valve on my tank that I shut off after using the dozer. It keeps fuel from gravitating to the injection pump.