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AC-Farms 
Bronze Level
Joined: 24 Feb 2011
Location: Minnesota
Points: 9
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 Topic: 7020 engine problem
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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HagerAC
Orange Level
Joined: 14 Sep 2010
Location: SE MN
Points: 1189
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Posted: 28 Mar 2011 at 7:08pm |
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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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Orange Blood
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Joined: 29 Nov 2010
Location: ColoradoSprings
Points: 4053
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Posted: 28 Mar 2011 at 7:37pm |
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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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DougG
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Joined: 20 Sep 2009
Location: Mo
Points: 8208
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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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Orange Blood
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Joined: 29 Nov 2010
Location: ColoradoSprings
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Posted: 28 Mar 2011 at 8:27pm |
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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.
Edited by Orange Blood - 28 Mar 2011 at 8:29pm
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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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MACK
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Joined: 17 Nov 2009
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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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JohnCO
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Joined: 11 Sep 2009
Location: Niwot Colo
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Posted: 28 Mar 2011 at 9:56pm |
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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"
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Steve M C/IL
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Joined: 01 Jul 2010
Location: shelbyville IL
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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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MACK
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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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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
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Posted: 29 Mar 2011 at 9:06am |
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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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AC-Farms
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Joined: 24 Feb 2011
Location: Minnesota
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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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7060
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Joined: 16 Sep 2009
Location: Missouri
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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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