1963 Ford 4000 now accelerates to full speed

Tom in TN · Dec 2, 2015

A while back I posted a message about my old-style, diesel, Ford 4000. The engine started and ran well, but the maximum RPM I could get
out of the engine was 1,500 RPM. After much messing with it, I finally decided to have it fixed by someone who actually knew what they were
doing.

I had it picked up yesterday and it was returned to me today. The problem was a clogged fuel return line. No parts needed. One hour of labor
at $55.00 per hour. And a pick-up and delivery fee of a total of $90.00.

Thanks again to all of you who responded to my earlier post. I learned a whole bunch about diesel engines as a result of your suggestions.

Tom in TN

James Wilson · Dec 2, 2015

That is great, good luck with it.

kub6040 · Dec 2, 2015

sorry none of us got you the correct answer so you could keep your 90 bucks.

Tom in TN · Dec 2, 2015

kub,

Like I said before, I've never owned a diesel engine before, so I probably would have missed it even if someone had specifically said to check that out. I have a 500 page Service Manual for that tractor, and it didn't say a single word about the fuel return line. I looked at the book again this afternoon after the tractor came home, and sure enough, the return line is shown in a diagram of the fuel lines, but the text says nothing about it.

I'm now an "expert" on slow running diesel engines. I just hope that someone else has a similar problem, then I can be a "hero" by suggesting that they check that line!

Tom in TN

M-MAN · Dec 3, 2015

What you have ask is where and why was it clogged. If it was the check ball fitting that attaches the line to the pump the flex ring in the pump is going out. If it was the line itself the rubber section disintegrated.

sotxbill · Dec 3, 2015

clogged return line will not let the pump get fuel... as weird as it sounds.

Thanks for reporting back.

Roosamaster pumps had a Teflon governor ring that would get brittle and break off pieces... and that would clog the return line and then the weird problems started... replacement with a brass ring was the better fix.

Tom in TN · Dec 3, 2015

M-Man,

Thanks for the additional information. I haven't spoken to the actual mechanic that fixed the problem, but I'll try to follow up on that issue.

Tom in TN

Tom in TN · Dec 3, 2015

sotxbill.

I'm a bit disappointed in the shop manual that I bought, in that it doesn't say a thing about the return fuel line in any of the procedures concerning the injectors, pump, or lines. And, it doesn't mention it in the trouble shooting guides.

I guess I'm glad to know about it now, but it would have been good to know about it earlier.

Tom in TN

1963 Ford 4000 now accelerates to full speed

Tom in TN

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James Wilson

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kub6040

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Tom in TN

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M-MAN

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sotxbill

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Tom in TN

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Tom in TN

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