2900 MKII engine, can a MKI head be installed?
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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=196130
Printed Date: 05 Nov 2025 at 1:26pm
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Topic: 2900 MKII engine, can a MKI head be installed?
Posted By: GM Guy
Subject: 2900 MKII engine, can a MKI head be installed?
Date Posted: 12 Jul 2023 at 11:15pm
Hey all,
Have a friend that is in need of a head for a 2900 MK-II, (649 wheel loader) and he cant seem to find a crack free one.
My question, would one off a Mark-I work? (190XT, Gleaner G, etc.)
Also, is he being too picky on cracks? Are common cracks on the MK-II head usually runnable?
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Gleaner: the properly engineered and built combine.
If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help.
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Replies:
Posted By: DrAllis
Date Posted: 13 Jul 2023 at 6:04am
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I don't think the engine will care. There could be some accessories that bolt to that copper sleeve head that won't have a bolt hole on the old style head. Injectors must be changed completely as the tips are waay different.
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Posted By: tbran
Date Posted: 14 Jul 2023 at 8:41am
This brings to question - there were pre Mark I engines like the G Gleaner, XT etc. Then the Mark I 's in the 301 . Some 2800's went into cotton pickers like the 860 but did not have copper sleeves. I think I remember the Mark's went into the sales promotion in the early 70's. Think the Mark's were a duty rating - not really sure about copper sleeve heads in all the Mark 1 's - All the Mark II had them - some engineer (knew him) sold this feature to the powers that be as Cummins started using them to cool the injectors. So he thought AC needed them wright, wrong or indifferent - wrong in my opinion. We have replaced some 7020 heads with early heads / injectors with no issue where the copper sleeve heads failed.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: DrAllis
Date Posted: 14 Jul 2023 at 8:54am
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I'm not exactly sure on the "Mark 1" and "Mark II" dates either. I'm pretty sure a 1972 model "L" Gleaner had copper sleeves and that gosh darned CAV brand in-line injection pump and a ton of engine oil cooler plumbed all the way around the engine. That didn't last very long and then the DM-4 StanaDyne with the large bulging right side oil cooler became the 130 HP option on the M2's while the standard 120 HP version had the "DC" StanaDyne pump and I thought no copper injector sleeves?? I've never seen a copper sleeved head on a 2800/non-turbo 301.
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Posted By: tbran
Date Posted: 14 Jul 2023 at 9:03am
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There was a "kit" to change out the Simms to a RM. The issue was AC did not use the configuration of Simms that Ford did. One of the issues was self inflicted - customers turned the fuel up and at full rack it went into a cranking retard position... We have one in a XT - runs great and cranks at the push of a button. You know I never looked to see if it had copper sleeves. Will look next time down at the farm. While ramblin' Gleaner tried to use an aneroid (sp?) on the fuel pumps in the early 70's - to no avail.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: DrAllis
Date Posted: 14 Jul 2023 at 9:33am
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I might be wrong on the 1972 model "L". Maybe it didn't have the copper sleeves, as it was only 120 HP. The 7000 farm tractor was the first copper sleeve tractor in Summer of 1975, so maybe I'm incorrect on the L combine engine. EDIT: Nope. Just looked at AGCO Parts Books. The 72/73 L had injector copper sleeves, crazy engine oil cooler, luberfiner oil filter and Simms injection pump. More info: seems like the copper sleeve head was cast in a couple different styles. The earliest ones had a cover plate on the rear of the head and no plate on the front. I believe these are Mark 1 with 120 HP. It then says a different head assembly for 130 HP Mark 2 engines and it shows a cover plate on the front instead of the rear. I've only worked (in depth) on one 1972 model L engine and that was 45+ years ago.
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Posted By: tbran
Date Posted: 14 Jul 2023 at 1:45pm
Unfortunately the parts catalogues have been mangled down through the years - if you look it shows copper tubes on the 180-185's - probably subbed the parts as they were replaced with newer stuff.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: Calvin Schmidt
Date Posted: 14 Jul 2023 at 6:49pm
I have a 3500 MK II "Highway spec" engine with the Simms injection pump in my 220. Starts great. Added an intercooler. Had 82 original hrs. Was on a standby waterpump. Everything else is factory spec. Dynos 190 HP.
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Nothing is impossible if it is properly financed
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Posted By: GM Guy
Date Posted: 15 Jul 2023 at 8:36am
So a 190XT motor shouldnt be copper sleeved, correct?
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Gleaner: the properly engineered and built combine.
If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help.
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Posted By: Lynn Marshall
Date Posted: 15 Jul 2023 at 8:41am
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None of 190s used the copper sleeves.
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