5020 hard to start
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=121965
Printed Date: 12 Oct 2025 at 8:24pm
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Topic: 5020 hard to start
Posted By: Adam Stratton
Subject: 5020 hard to start
Date Posted: 15 Apr 2016 at 8:47am
| I'm working on a 5020 I've had sitting for a few years. It runs well, but it is a real guessing game if it will start. If it were a gas tractor, I would diagnose that the timing was a bit retarded. When cranking, it smokes black fuel smoke. It will hit occasionally, but acts a little late, and doesn't hit enough to actually start. When it does start, it acts like it has to gain momentum, like a gas tractor working through a flood, then it cleans up and runs good. I put new glow plugs in and use them according to the decal. Is there a trick to starting them, or a way to check the advance or timing or?? Thanks in advance. |
Replies:
Posted By: injpumpEd
Date Posted: 15 Apr 2016 at 8:52am
|
since it's been sitting, have you worked on the injectors? Those compact diesels deliver such small amounts of fuel, that by the time the pump overcomes a sticky injector, it's too late, hence the retarded timing symptom. You can try just running it more with good fresh fuel, and a quality additive. ------------- 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: farmtoybuilder
Date Posted: 15 Apr 2016 at 9:19am
|
Low compression will make them hard starting also. And make sure glow plugs are working!!! Good Hi Capacity battery, good cables and connections helps also. They won't start without heat! I always crack throttle a little & crank a couple revolutions, then pre heat at least 30 seconds, Bright orange on indicator! More when COLD weather. Next step as Ed said injectors! ------------- 5 different TT-10's,5 TT-18's Terra Tigers,B-10,2 B-207's,B-110,2 B-112's,HB-112,B-210,B-212,HB212,2 Scamp's & Homilite T-10. Still hunting NICE HB-112 & anything Terra Tiger & Trailers for them. |
Posted By: alan-nj
Date Posted: 15 Apr 2016 at 11:08am
Before the clutch went in my 5020, it always started, but acted similarly.....black smoke when cranking, and stumbled for a couple of seconds, then cleared up and was fine. used the glow plugs when cold, didn't need them when weather was hot. .....BTW, got my 5020 back together this week, bled and it and got it started a couple of nights ago; put the loader back on last nite. ------------- If ignorance is bliss, than happy days are here again. |
Adam Stratton wrote:Posted By: LeonR2013
Date Posted: 15 Apr 2016 at 12:26pm
| Adam, I think one of the suggestions made have to be it. Not that it makes any difference, but I lean towards the low compression idea. Years ago when Cummins was trying to reach the gov. standards, mandated by politicians who didn't know beans from bull foot, they had the same problem, hard starting, and when you would get them started they would slobber, and miss, and carry on until they built some compression and warmed up. I got to checking and the dang things only had about 13 to 1 comp. They weren't all that bad but if you had a smoker that's what you had. Not being from this world and hypnotized by their B.S. when I rebuilt my old 290 I went to Cummins and we dug thru. the specs. and found a piston that built if I remember right about 16.5 to 1 comp. By the way they were pistons built for a 270. Not much power there you say. Well I admittedly was building a mini hot rod, jest a little old cab over International. However, after turbo adjustment, injector adjustment, major pump adjustment, much bigger air canister and filter, snorkel, retarding the timing, match timing the injectors not just 1-3-5 but all six right down to half a 1,000 plus other things I don't remember, the dang thing ran well enough to send users of 425 Cats to the Cat house to get some work done. Not saying it was a 425 Cat, but we didn't get in everybodys way. And start? I quit the road in '86 and went into a shop and later when it got cold I would start it every two weeks and warm it up. I came from work one day and I don't think it had reached 30 degrees all day. With no either it rolled over and fired right up. No miss, no slobber, no smoke. Here I've run off at the mouth just trying to say, compression. Leon R Cmo |
Posted By: LeonR2013
Date Posted: 15 Apr 2016 at 12:34pm
| Dennis I want to apologize for taking up so much room on the previous post. I was just trying to help and I forgot where I was at. Once a gear head, always a gear head. Leon R Cmo |