856 IH with a knocking type noise - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 36 (permalink) Old 09-01-2009, 12:27 AM Thread Starter
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856 IH with a knocking type noise

This one has me scratching my head a bit... My dad's tractor developed a bit of a knocking sound last spring, so I pulled the pan thinking it was bottom end bearings, as with the stethoscope, the bottom is noisy. I plastigauged all the mains and rods, and they all checked out ok. The oil pressure is around 60 lbs at idle, and I went ahead and adjusted the valves since they hadn't been done for since he put the motor in back in the 80's... This motor has never been torn down likely since it was built, and when I listen with the stethoscope, the head area and middle of the block are pretty quiet, but the bottom end has just gotten louder.I'm thinking perhaps we should just throw in some bearings for good measure, but std bearings are definitely not cheap, but of course, neither is a crankshaft if one goes. It does appear to have the original injectors as well, but it has no smoke or missing at all, runs as smooth as always. Listening to the injector pump is noisy, but it may just be how the Roosa's are, can't answer, should probably compare it to my 6.9. Opinions/ideas?

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 36 (permalink) Old 09-02-2009, 03:10 AM
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how did the bearings look when you used the plastigauge? were they down to the copper or anything?

'94 F250xlt ext. cab. ZF5-speed 4x4. EBPV delete. DPP downpipe. Tymar intake. Tymar coolant filter. LF9691 primary filter. Electric fans. 10k mod. 1.0 turbo housing. Boost blanket. Over-axle exhaust eliminated. Electric fuel pressure gauge. BDP modded IDM. Heim joint clutch linkage. Adrenaline HPOP. LUK SMFW. DIY Elec. Fuel. FS1282, FF5230 fuel filters.
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post #3 of 36 (permalink) Old 09-02-2009, 03:13 AM Thread Starter
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For as many hours were on the motor, I have never seen such clean bearings. No copper at all, the lead was still there, just a little scratching as would be expected. Had they shown me copper, I would have switched them out.

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 #4 of 36 (permalink) Old 09-02-2009, 04:54 AM
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I have never had much luck myself trying to listen for where a knock is coming from, the sound always seems to resonate to a different part of the engine. Have you cracked each injector individually to rule out injector knock from a bad injector?

Brady

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88' Ford F250, 4x4, 7.3L Diesel, Banks Sidewinder, 5 spd, flatbed, feed-truck
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post #5 of 36 (permalink) Old 09-02-2009, 11:46 AM Thread Starter
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I did do a few, but wouldn't a bad injector also be accompanied by smoke/missing?

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 #6 of 36 (permalink) Old 09-02-2009, 03:47 PM
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I agree, and actually considered that before posting my original post, it's just that I don't know how many times I have overlooked the simple solutions because I didn't think the symptoms warranted the simple diagnostic.

Other ideas, (not really being familar with IH engines) excessive crankshaft endplay, failed harmonic balancer, or bad camhaft and lifter.

Good luck I hope whatever you find isn't to big a problem.

Brady

2002 Ford F350 Crew cab, 4x4, XLT, 7.3 Powerstroke Diesel, AIS filter kit, 6 speed, Ali-arc aluminum frontend replacement
88' Ford F250, 4x4, 7.3L Diesel, Banks Sidewinder, 5 spd, flatbed, feed-truck
78' Ford F250 supercab, Dana 60's, C-6 and a slightly modified 400m- dead, soon to be a 460. 6" skyjacker lift with 38.5 boggers, play-truck
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post #7 of 36 (permalink) Old 09-03-2009, 12:43 AM Thread Starter
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For the most part, the IH engines are set up like most, not anything exotic or unusual. I hadn't thought about the balancer, and that does make a bit of sense, and I'm sure it is factory original. They use solid lifters on the cam, and all the rockers were pretty close on adjustment when I reset them. The injectors are controlled by a Roosamaster rotary 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 #8 of 36 (permalink) Old 09-03-2009, 01:04 AM
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Dang, I was just going to suggest the vibration dampner. I truly believe that is the problem. That will most often times be the reason. Have you noticed any oil leakage in the front of the engine, especially from the bottom end.

Why farm half when you can FARMALL!

Give fools their gold, and knaves their power;
Let fortune's bubbles rise and fall;
Who sows a field, or trains a flower,
Or plants a tree, is more than all.- Whittier.

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When you subsidize poverty and failure, you get more of both
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post #9 of 36 (permalink) Old 09-03-2009, 01:45 AM
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Dude, I just remembered this. My grandpa used to feed cattle with this Farmall 560 that had an IH D282. It started knocking real bad so I dropped the pan ( not really knowing what to even look for ) and noticed the crankshaft was broken in two at one of the main bearings. I think it was right at the #1 main. Might look at that.

'94 F250xlt ext. cab. ZF5-speed 4x4. EBPV delete. DPP downpipe. Tymar intake. Tymar coolant filter. LF9691 primary filter. Electric fans. 10k mod. 1.0 turbo housing. Boost blanket. Over-axle exhaust eliminated. Electric fuel pressure gauge. BDP modded IDM. Heim joint clutch linkage. Adrenaline HPOP. LUK SMFW. DIY Elec. Fuel. FS1282, FF5230 fuel filters.
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post #10 of 36 (permalink) Old 09-03-2009, 02:09 PM
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Quote:
Originally Posted by sdan27 View Post
Dude, I just remembered this. My grandpa used to feed cattle with this Farmall 560 that had an IH D282. It started knocking real bad so I dropped the pan ( not really knowing what to even look for ) and noticed the crankshaft was broken in two at one of the main bearings. I think it was right at the #1 main. Might look at that.
That is exactly what happened to mine.

Why farm half when you can FARMALL!

Give fools their gold, and knaves their power;
Let fortune's bubbles rise and fall;
Who sows a field, or trains a flower,
Or plants a tree, is more than all.- Whittier.

"A Liberal is a person who will giveaway everything he doesn't own

When you subsidize poverty and failure, you get more of both
Diesel Power
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