190 gas block to diesel
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=172909
Printed Date: 14 Oct 2025 at 2:35am
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Topic: 190 gas block to diesel
Posted By: HARVESTMOONPULLER
Subject: 190 gas block to diesel
Date Posted: 18 Jul 2020 at 10:42pm
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I bought a non running xt and started to rebuild it. I had all the machine work done and sleeves installed. I just happened to notice the crank and cam gear that came in it are for a gas. Crank part # 4022256 with 4020002 gear and cam part # 4021108 with a 4021289 gear. I also believe the block is gas casting # 4021832 I have another motor that hasn’t been apart but had a knock. I’m wondering if I can take the diesel crank, cam and all the associated gears and throw them in the gas block. Everything motor related on the tractor in question appeared to be properly hooked up (turbo drain, turbo oil supply etc.) Diesel part numbers I’d like to put in it are crank # 4023823 and cam # 4023915.
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Replies:
Posted By: DrAllis
Date Posted: 19 Jul 2020 at 8:12am
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As long as you are using the bayonet style/cam driven oil pump and the crankshaft with the narrow gear, everything will work.
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Posted By: tbran
Date Posted: 19 Jul 2020 at 9:11am
Just to be double sure, the block you are using had the oil cooler and was running,,, the oiling is different on all the gas units vs turbo diesel w/cooler. The diesel w/oil cooler routed the oil to cooler then via external tube to the right rear of the block. The 2800 diesel and gas w/o cooler let the oil go through the passage in the block side and rear. There is a plug and spring in the back of the block that is used w/cooler . We are always concerned when 2800/2900 applications are changed. Just double checking.
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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: HARVESTMOONPULLER
Date Posted: 19 Jul 2020 at 10:44am
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The gas block I took out of the xt to the machine shop was not running but it had all of the diesel stuff on it. Was told they blew the motor, rebuilt it it and blew it again. If I had to guess they broke some hard parts the first time, threw something together that wouldn’t work and ended up blowing it again. I have a complete diesel that had a knock I bought for 100 bucks just trying to save the 1100 machine shop bill by using the gas block I already had all the work done on. I will double check all of these things and post what I find.
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Posted By: DrAllis
Date Posted: 19 Jul 2020 at 10:47am
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So, they had the turbo diesel passage slug and spring in the rear oil cross-passage in the block?? As a result they didn't have any serious oil pressure to the mains and rods, so I imagine they did blow it up twice.
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Posted By: SteveM C/IL
Date Posted: 19 Jul 2020 at 11:42am
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That oil passage thing is very important to understand as Tbran says. Danger,Danger!!
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Posted By: HARVESTMOONPULLER
Date Posted: 20 Jul 2020 at 7:03am
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The gas block I took to the machine shop had the oil plug and spring installed in it. The diesel block I have also has it installed. They look like the same passages but your saying the gas block shouldn’t have the plug and spring if it’s going to run as a diesel?
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Posted By: DrAllis
Date Posted: 20 Jul 2020 at 7:16am
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A gas and non-turbo diesel engine cannot use that slug and spring !!!!! turbo diesel with oil cooler must use the slug and spring !! Blocks are the same between all three engines.
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Posted By: HARVESTMOONPULLER
Date Posted: 20 Jul 2020 at 11:18am
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So pull the crank, cam, and rest of the gear train off the diesel block, throw into the gas block and continue assembly as a turbo diesel?
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Posted By: DrAllis
Date Posted: 20 Jul 2020 at 12:08pm
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As long as those oil passage are clean, go for it.
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