8070 Questioin
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=25849
Printed Date: 29 Oct 2025 at 9:39pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8070 Questioin
Posted By: Roger D Slaughter
Subject: 8070 Questioin
Date Posted: 16 Feb 2011 at 8:02pm
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No power, black smoke...I have checked turbo boost and have less then 5 lbs. New turbo about 1 year old. Removed air tube from turbo to manifold and have very little air coming out of turbo, no pressure. Turbo spins but doesn't whistle with muffler off.
Any suggestions?
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Replies:
Posted By: injpumpEd
Date Posted: 16 Feb 2011 at 8:20pm
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check intake manifold for any plugs that may have fallen out. could be exhaust manifold plug fell out, or cracked manifold of even blown gasket for intake or exhaust manifolds. Take air cleaner pipe off inlet of turbo, make sure nothing restricting airflow there. Come on all of a sudden? Starts and runs fine? good luck, Ed.
------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: DrAllis
Date Posted: 16 Feb 2011 at 8:31pm
| Disconnect the rubber hose at the turbo that goes over the top of the radiator and try another boost test or remove both air filters and try it for a quick test. No change, then you must have a bad turbo or a blown intake manifold gasket... also make sure the 1/4" pipe plug under the turbo isn't missing and all three plugs( two 1/4" pipe and one much larger plug) are installed on the side of the intercooler and the top square plate has 4 tight bolts holding it to the top of intercooler. You don't say how suddenly this happened. |
Posted By: Orange Blood
Date Posted: 16 Feb 2011 at 8:31pm
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I would check your fuel delivery, not enough fuel will not produce boost. A lot of people think boost is built from just air flow through the turbo hot section. Flow is only a small part of the equation, to really build boost you need heat, and expansion, to get the latter you need a hot fuel mix in the combustion cycle, sounds like if all fittings are tight, your combustion is cold, either not enough fuel or really bad compression, I would bank on the fuel delivery. Check your fuel filters first, change them if you haven't in a while, then look at the pump.
Since you say you have no smoke, it sounds like the intake side of things is clear, but the guys are right, check it anyway, do you have a vacuum guage, see if there is a large vacuum pre turbo on the intake side, should be a little, but not much.
Just my $0.02
Anthony ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: Roger D Slaughter
Date Posted: 16 Feb 2011 at 8:40pm
| I took the muffler off , unhooked theair claener tube, checked the exhaust manifold and checked the intake side. It starts and runs ok. I put a new turbo on it about 2 years ago and it leaked in less than 1 year. took it off and had it redone and now there is oil in the turbo output side. 35 years allis tractors and the first turbo. |
Posted By: MACK
Date Posted: 16 Feb 2011 at 8:49pm
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5 lb of boost would be about righr if it is running wide open with no load.
With cross over off, put hand over turbo outlet and open engine wide open. Should have enough pressure to almost push hand off of outlet.
Make sure nothing is pluging inlet to air cleaner. MACK
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Posted By: injpumpEd
Date Posted: 16 Feb 2011 at 8:56pm
------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Orange Blood wrote:Posted By: Orange Blood
Date Posted: 16 Feb 2011 at 8:58pm
------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: injpumpEd
Date Posted: 18 Feb 2011 at 9:23pm
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what have you come up with?
------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: Roger D Slaughter
Date Posted: 19 Feb 2011 at 10:24am
| Took the turbo to have checked...all ok with Turbo. Going to check the oil return line and check the intake manifold gasket. |