7020 engine problem
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=28116
Printed Date: 01 Mar 2025 at 1:01am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7020 engine problem
Posted By: AC-Farms
Subject: 7020 engine problem
Date Posted: 28 Mar 2011 at 6:17pm
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Hi, I am a fairly new forum member, but have been a frequent reader for a long time. My family and I still use quite a few AC's in our farming operation and know this is a great source for info. We have recently acquired a 7020 that has a miss in it. The pan is over full with diesel, and the top of the exhaust pipe is very wet, too. It doesn't seem to have much blow-by, but not knowing the history we haven't run it much. Someone told us it probably has a hole in a piston, but we're not sure? We were thinking of pulling the injectors and get them checked, and from there possibly the head? I was wondering if any of you had any advice or things to look for. Sorry for the long post, and thanks in advance for any advice, Kevin.
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Replies:
Posted By: HagerAC
Date Posted: 28 Mar 2011 at 7:08pm
Could possibly be the shaft seals for the injection pump letting the fuel get into the pan, but that would not account for the miss.
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30+ A-Cs ranging from a 1928 20-35, to a 1984 8070FWA, Gleaner R52
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Posted By: Orange Blood
Date Posted: 28 Mar 2011 at 7:37pm
I bet you have a brocken spring in an injector, allowing the pop pressure to be very low, if at all. You need to get this fixed asap, as you are washing the cylinder liner with fuel, and causing big time wear on the walls.
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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
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Posted By: DougG
Date Posted: 28 Mar 2011 at 8:19pm
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That sounds right !!! Check them injectors , crack each imput line and see which one doesnt make a difference in the miss and you,ll have it
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Posted By: Orange Blood
Date Posted: 28 Mar 2011 at 8:27pm
I finished reading your post, if you have a burnt through piston, it will have severe blow by, and I don't think you would get much out the stack. get that oil drained asap as well, since the bearings can tolerate some but not a full pan worth.
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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
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Posted By: MACK
Date Posted: 28 Mar 2011 at 8:54pm
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Tip blown off a injector do to water in fuel. MACK
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Posted By: JohnCO
Date Posted: 28 Mar 2011 at 9:56pm
Mack, Just curious, how much more would water compress then fuel in a injection system?
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"If at first you don't succeed, get a bigger hammer"
Allis Express participant
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Posted By: Steve M C/IL
Date Posted: 28 Mar 2011 at 11:17pm
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The problem is when water in fuel hits the hot injector tip,it turns to steam and blows the tip off.
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Posted By: MACK
Date Posted: 29 Mar 2011 at 6:43am
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Water willnot break down small enough to go through tip. MACK
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Posted By: Brian Jasper co. Ia
Date Posted: 29 Mar 2011 at 9:06am
And it also has no lubricating properties...
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: AC-Farms
Date Posted: 29 Mar 2011 at 11:15pm
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Thanks for the advice, hopefully we'll get time to look at the injectors this weekend. Kevin
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Posted By: 7060
Date Posted: 29 Mar 2011 at 11:56pm
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My 7060 has blown holes in a piston twice and when it does it you have alot of blowby and it smokes like a freight train.
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