Smoky 966 IH - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 01-04-2008, 04:42 AM Thread Starter
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Smoky 966 IH

I just got done replacing sleeves, pistons, and crank bearings on my uncle's 966. It was a heavy smoker before changing out the bottom end parts. One of the sleeves had cavitated through, as well as the pistons and sleeves were pretty scored up from lack of cleaning out the air filter for a long time... Anyway, my uncle was claiming the injection pump is bad, but once it warmed up in the past, it would quit smoking. It didn't smoke as much after warming up a bit, until I tried to revv it that is. The primary fuel filter looks to have been there for a while, the secondary looks to be newer. I am thinking the filter may be starving the pump a bit, making all the smoke, or is my uncle correct on the injection pump?

The workhorse: 86 F250 6.9 4 speed 4wd 4.10 gears, electric fuel pump
The other workhorse: 92 F350 2wd crew cab, 92 6BT Cummins, NV4500 and GV overdrive unit, 4.10 rear axle
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post #2 of 9 (permalink) Old 01-04-2008, 12:05 PM
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well we need to know what color smoke you're getting...that makes a big difference and what could be the cause...how many hours are one the tractor...see you have a fresh rebuild you should be able to elimanite rings and such from your troubles...my guess is leaky injectors...its pretty common on higher hour machines...I would change to fuel filters to start with but I dont think its gonna solve your smoking problems...maybe someone else will chime in with some suggestions...:Thumbup:

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post #3 of 9 (permalink) Old 01-04-2008, 03:15 PM
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First off I would have never even started without changing all fluids and filters, but that is me. So I would at minimum change the fuel filters. I will also agree on the injectors proably getting sloppy, although the pump could be getting weak also, but that should not be casuing a smking problem since you are getting plenty of fuel delievered.

Does it start hard or easy? Did you not do any headwork?
post #4 of 9 (permalink) Old 01-04-2008, 03:47 PM Thread Starter
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I think I got it, the timing was retarded pretty badly. I forgot to mention the smoke was grey, and the diesel was definitely not burning. It wouldn't fully revv either. Now it will. I like to put all fresh fluids and filters on a rebuild too, I made my father do what I could, he is so about the pennies...
I told him to change it as well with the problems it was giving. Injectors are new, head was gone through. It started real easy even retarded, just as good now. I set it at the 18 degree mark, and the timing mark for the pump was at least an 1/8" out of place. Took the timing gear loose, moved it to the right place, and it has very little smoke. I never messed with the timing gears before, just the sleeves and pistons.

The workhorse: 86 F250 6.9 4 speed 4wd 4.10 gears, electric fuel pump
The other workhorse: 92 F350 2wd crew cab, 92 6BT Cummins, NV4500 and GV overdrive unit, 4.10 rear axle
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post #5 of 9 (permalink) Old 01-04-2008, 03:52 PM
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The timing makes sense, especially if it was way retarded it was not having enough time to burn the fuel on the compression stroke. Don't be surprised though if it is a little harder to start when cold now that it is advanced.

Less timing = easier starting
More timing = harder starting

Glad you got it worked out.
post #6 of 9 (permalink) Old 01-04-2008, 04:01 PM
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I'm with Bouncer. Should ALWAYS change ALL of the fluids and filters before starting.

Would I be correct in assuming you have white smoke? If the fuel injection pump was removed, I'd double check the timing. Also, pull the fuel injection nozzles out and pull the pump and have them tested. Probably wore enough to be the problem.

Also, check the oil. If by chance there isn't a good seal on the headgasket, water will turn the exhaust white.

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post #7 of 9 (permalink) Old 01-04-2008, 04:03 PM
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I need to type faster.

Glad you got it.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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post #8 of 9 (permalink) Old 01-06-2008, 04:32 AM Thread Starter
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Well, it would seem that the timing has been off for years, after asking some questions. In the past, this tractor had burned, so I suppose they changed the injection pump, but never timed it right. AS my uncle got worse with his cancer, his maintenance was minimal, and the symptoms showed up worse, probably contributed to it's demise that made this overhaul necessary. That and the fact he ran straight water in it...

The workhorse: 86 F250 6.9 4 speed 4wd 4.10 gears, electric fuel pump
The other workhorse: 92 F350 2wd crew cab, 92 6BT Cummins, NV4500 and GV overdrive unit, 4.10 rear axle
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post #9 of 9 (permalink) Old 01-06-2008, 01:43 PM
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Yep, that would've done it.

Sorry to hear about your uncle. My mom is going through the same thing.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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