1850 diesel high rpm miss

1850Dpuller · Jul 29, 2015

My working 1850 diesel starts to miss sometimes inconsistently at about 2,000 rpms and up until it really loads up. I have had three different injection pumps on it and no change. Any thoughts? Worn injectors or timing gears maybe? Thanks

duane o. · Jul 29, 2015

I've got a couple diesels that do that. I've narrowed it down to the crappy diesel fuel we have these days. I mix some 2stroke oil in with the fuel to slow down the burn of fuel. I've heard that adjusting the fuel pump timing advancing it a bit stops the miss but have not yet gotten to trying it maybe others on here can add in their thoughts.
Duane o.

BM · Jul 29, 2015

Common 1850 problem. It's caused by worn injection pump drive components, mainly the female coupling in the end of the pump, and the short drive shaft. Timing dancing around causes the flutter. Those 2 parts are fairly easily replaced and usually reduce the flutter by quite a bit.

Dieseltech · Jul 29, 2015

Xs 2, common with higher hour pump drives. That's why the heavier uprate drives came out. I've seen the splined quill shaft split lengthwise, drive hubs explode with the splined setup. Best to update to the heavier drive setup, but the engine has to be apart..

J. Schwiebert · Jul 30, 2015

We had one that did that. I flow timed the pump to compensate for the bent shaft and the miss went away.

1850 diesel high rpm miss

1850Dpuller

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duane o.

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BM

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Dieseltech

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J. Schwiebert

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