ambac pump 8050 problem/?..I think?
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=114484
Printed Date: 15 Sep 2025 at 7:18am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: ambac pump 8050 problem/?..I think?
Posted By: Leon B MO
Subject: ambac pump 8050 problem/?..I think?
Date Posted: 09 Nov 2015 at 8:03pm
|
OK, sorry long post. This 8050 has been giving us heating problems for 3 years. I've posted here before and even thought the problem solved. We've done everytihing, rad recored, foam, water pump, oil cooler cleaned and tractor was still getting hot under a load. The tractor just seemed sluggish, runs, starts and pulls OK, but just didn't have the pep or power it should. The engine front cover was remmoved last winter to fix leaks. The crank pully dimples are in line and the inj. pump is in time at 19 degrees btc. Pump was rebuilt in about 2008. OK, here we go, my mechanic is as good as it gets, former AC mechanic, hes's been working with me to find the problem. I ask him if there is a way to check the timing, he shows up with his diesel timing light. ( I didn't even know such a thing existed.) He hooked up to #6. At 900 rpm's it was actually only at 16 degrees, but steady. At 1800 rpm's, the mark would move from 16 degrees to where the the mark was so far down it was barely visible with the light and erratic, moving up down, dissappearing, back up to 23 degrees and all over. The tractor did not sound like it was laboring or missing or knocking or running all that poorly, tried # 1 and same result. Mechanic starts talking about the advanced timing inside the pump, I know very little about the workings of an injection pump. He said he wasn't sure how or why the timing could be so erratic. Not even sure if the rebuilders have a way to test or check the oil driven advance system. Any input is appreciated, will a pump rebuid fix this or where do I go from here? If you want you can pm me or post here. Thanks. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Replies:
Posted By: MACK
Date Posted: 09 Nov 2015 at 8:41pm
| That is a common problem with that pump. Have saw them retard so far they would melt the decal on 8000 series hood. Yes, a good pump station can fix the gov. problem. Not to say it may do it again in a few years. MACK |
Posted By: injpumpEd
Date Posted: 10 Nov 2015 at 7:01am
|
The "intravance" relies on engine oil pressure to function properly. First thing to do is make sure you have at least 50 psi in the line to the injection pump. The erratic movements from the light can be poor connection at the line. Most lights I've seen or have, the advance can be adjusted on the light to bring the two marks together, then the number of degrees of advance can be read in the digital display. With a diesel timing light, the signal gets confused as the rpms go up. This does sound like you have intravance problems in the pump by the symptoms you give. ------------- 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: Leon B MO
Date Posted: 10 Nov 2015 at 11:44am
|
Thanks for the replies. It's helpful. Could this be part of my overheating problem for the past year? Would the ink.pump continue to run incorrectly that long? Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: injpumpEd
Date Posted: 10 Nov 2015 at 12:27pm
|
The inj pump could be not advancing it as far as it's supposed to, but it could be because your oil pressure may be too low, or just too low at the injection pump. Yes, running with late timing will make it labor, and thus overheat. ------------- 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: Leon B MO
Date Posted: 10 Nov 2015 at 1:34pm
|
50 psi at what rpm. We have 40 psi at 800 rpm? ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: injpumpEd
Date Posted: 10 Nov 2015 at 2:32pm
|
that should be fine. Just be sure the pump is getting that oil pressure also. ------------- 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: Leon B MO
Date Posted: 10 Nov 2015 at 2:47pm
|
10 4, I'll let ya know what I find. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: Peterson
Date Posted: 10 Nov 2015 at 4:33pm
Inline pump swap time! Lol  ------------- 7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2 |