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Gleanermanl2 
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Joined: 29 Sep 2013
Location: Kansas
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 Topic: 8070 ambac pump
Posted: 03 Jun 2025 at 6:16am |
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Getting the pump and injectors redone on the 82 allis 8070. I read somewhere about the brass tee on the pump needing drilled out from .040 to .052. Is that a true allis update and recommended on my tractor?
Also had some guys talk about setting pop off pressure on injectors to 3600 vs the allis rated 4200. Is that recommended for my tractor?
Anything else I should know while I have the pump at the shop?
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DrAllis
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Joined: 12 Sep 2009
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Posted: 03 Jun 2025 at 6:37am |
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Do BOTH updates.
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Gleanermanl2
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Posted: 03 Jun 2025 at 12:27pm |
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I appreciate you dr allis!
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DrAllis
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Posted: 03 Jun 2025 at 12:42pm |
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I'd be surprised if that orifice hasn't been drilled out already. We did a couple dozen of them back in the early-mid 1980's. I made a tool to do it on the engine so pump removal wasn't needed. The lower injector pressure setting will help make the inj pump and injectors last longer and still perform just fine.
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Gleanermanl2
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Posted: 19 hours 41 minutes ago at 11:56am |
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Got off the phone with the pump shop today. They said they had never heard of drilling out that orifice and wouldn't do it and stand behind the pump. Thought it was odd. I assume that would have been an allis only update?
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DrAllis
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Posted: 19 hours 7 minutes ago at 12:30pm |
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I got the information from an official A-C bulletin probably in late 1982. It was to cure an engine "rattling" noise at certain RPM's. Ed would know if AmBach ever sent out a letter. Have these guys even checked to see what the orifice size is ??? It may be drilled out already.
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Gleanermanl2
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Posted: 18 hours 46 minutes ago at 12:51pm |
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He claimed it was still .040. I bought #55 drill bit and I'm going to drill it myself. I was just surprised that this wasn't listed in the updated foot notes for the pump rebuild. He did put a new head in the pump and claimed the introvance had too much backlash. He put new tips on all the injectors as well. My local gleaner dealer says they are the go to shop for these pumps so I'm not real concerned they don't know what their doing but the orifice thing makes me scratch my head a bit. I have read enough of dr allis posts to know you are very knowledgeable but also at the same time I remind myself I am listening to someone I don't know on the internet over the injection pump shop. I consider myself fairly smart and I can tell people who post with knowledge and people who don't know a 1/2 inch wrench from a 13mm. That is why I plan to drill the orifice out. It's kind of scary that without dr allis and his knowledge I don't think I would have ever heard of this! I thank you sir
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injpumpEd
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Location: Walnut IL
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Posted: 18 hours 16 minutes ago at 1:21pm |
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That tee is not even an AMBAC part, it's an Allis part. I have the bulletin that discusses the increasing the orifice size. I do it to all the AC M100's I do here, and if they don't come in with the tee, I sell them one, as it is part of the pump calibration. The original hole was .040", and new size is .052", and use a #55 drill bit according to the bulletin. Many shops fail to replace all the orings on the fittings, including the tee.
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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!
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Lynn Marshall
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Posted: 13 hours 49 minutes ago at 5:48pm |
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I can distinctly remember that particular bulletin too. I may even have a copy myself. It doesn't seem possible that it's been 43 years ago.
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Gleanermanl2
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Posted: 10 hours 53 minutes ago at 8:44pm |
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I appreciate all you guys chiming in here. There's a lot of knowledge between the ears of you fellas and I'm so grateful your willing to share it. It makes me wonder if there are other updates I'm unaware of. I wish there was a list I could refer to. I suppose Schmidt and sons in Mt hope would be my best dealer space that might have held onto that information. I should give them a call sometime.
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