Allis chalmers 7030 blowby problem - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 10-20-2014, 01:34 PM Thread Starter
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Allis chalmers 7030 blowby problem

Hello guys, looking for some pointers on a 7030 we run our bale processor on. It has always ran good then when processing a bale then it got alot of blow by. It's a little low on power. It does puff out the vent and gets worse with rpm and load...any ideas?

We have checked for oil/exhaust in coolant and vice versa and engine doesn't miss either. Pulled valve cover to see if anything was bent/broken and ran it and all looks good there.
Can a turbo do this? Also, had one guy that thought it could be a cracks in head gasket at a cylinder. Also oil consumption is negligible. TIA.
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post #2 of 6 (permalink) Old 10-20-2014, 07:07 PM
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Originally Posted by 89'4964F View Post
Hello guys, looking for some pointers on a 7030 we run our bale processor on. It has always ran good then when processing a bale then it got alot of blow by. It's a little low on power. It does puff out the vent and gets worse with rpm and load...any ideas?

We have checked for oil/exhaust in coolant and vice versa and engine doesn't miss either. Pulled valve cover to see if anything was bent/broken and ran it and all looks good there.
Can a turbo do this? Also, had one guy that thought it could be a cracks in head gasket at a cylinder. Also oil consumption is negligible. TIA.
Worn valve guides or piston rings? If its high on hours, usually that's where you get blow by.
Years ago I ran 7060 tractor.

Remember not to talk bad about farmers with your mouth full!
2013 6.7 CTD 2500, 800 ft-lbs torque, 4x4 crewcab Larmine Longhorn edition, 6 sp. auto, 2 tone white/gold
--07 6.7CTD 2500 4x4, Quad Cab, Big Horn Pkg. 3.73, airbags, 6sp auto, with Mag-Hytec deep pan.- sold but not forgotten.
--08 36' Jazz 5th wheel,triple slide, 12,000lbs
--28' 22,400# PJ goosneck beaver tail trailer
--95 & 96 5.9CTD 4x4 5sp. ext. cab. 33x12.50x16 front, 33x15.50x16 rear tires. R-1 tread, wheelbase shortened 30". Used as tugs on farm
--81 IH 1800, DT466 210hp, 10 speed,
--95 FL70, 8.3 cummins 275hp, 10speed
--79 GMC 7000, DD 6V53 210 hp, 6sp ally
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post #3 of 6 (permalink) Old 10-20-2014, 08:48 PM Thread Starter
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I was thinking a ring probably rolled. But I thought if just one cylinder was down on compression it would be rough running? There is no blowby under the valve cover which if a guide was bad there would be?
Guess I need to pull it apart...
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post #4 of 6 (permalink) Old 10-21-2014, 01:06 PM Thread Starter
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Would a bad turbo put pressure in crankcase?
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post #5 of 6 (permalink) Old 10-21-2014, 01:33 PM
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Would a bad turbo put pressure in crankcase?
If it was a bad turbo it would be pouring out the black smoke out the exhaust (more then it usually does) since it wouldn't be building boost and basically you would then be over fueling with not enough a air. If there was back pressure on the exhaust into the turbo, your blow buy would still be getting past the rings or valve guides.

I am assuming you are not losing any water, correct?

Remember not to talk bad about farmers with your mouth full!
2013 6.7 CTD 2500, 800 ft-lbs torque, 4x4 crewcab Larmine Longhorn edition, 6 sp. auto, 2 tone white/gold
--07 6.7CTD 2500 4x4, Quad Cab, Big Horn Pkg. 3.73, airbags, 6sp auto, with Mag-Hytec deep pan.- sold but not forgotten.
--08 36' Jazz 5th wheel,triple slide, 12,000lbs
--28' 22,400# PJ goosneck beaver tail trailer
--95 & 96 5.9CTD 4x4 5sp. ext. cab. 33x12.50x16 front, 33x15.50x16 rear tires. R-1 tread, wheelbase shortened 30". Used as tugs on farm
--81 IH 1800, DT466 210hp, 10 speed,
--95 FL70, 8.3 cummins 275hp, 10speed
--79 GMC 7000, DD 6V53 210 hp, 6sp ally
-- A whole bunch farm equipment, all colors
singles club # 198
WALNUT MEMBER #11(workers aganist lazy non-producers united together)
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post #6 of 6 (permalink) Old 10-21-2014, 01:36 PM Thread Starter
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Not losing water.
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