8550 engine
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=206775
Printed Date: 21 May 2025 at 8:28pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8550 engine
Posted By: TrentH
Subject: 8550 engine
Date Posted: 18 May 2025 at 7:34pm
We have a 8550 that the rear turbo started smoking and will not clear out even when it’s at operating temp and has what we think is a miss on one of the rear cylinders. Is it worth fixing the Allis engine or repower with a Cummins.
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Replies:
Posted By: DrAllis
Date Posted: 18 May 2025 at 8:04pm
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If it was as simple as changing out one injector, why wouldn't you fix it ?? Looks like some good diagnosis is needed.
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Posted By: TrentH
Date Posted: 18 May 2025 at 8:15pm
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Haven’t dug to deep into it yet. It looked like more of blue smoke, like oil. I was thinking it was probably rings. Was going to check for bubbles in the antifreeze and make sure it wasn’t that to.
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Posted By: Unit3
Date Posted: 19 May 2025 at 11:10am
Dad had a 4w305 that started smoking out the front pipe. It was a lifter, cam lobe, blued and bent push rods, and adjusting screws.
On the rocker arm shaft, grind the smallest of grove from the oil holes @ 4:00 up to 2 & 10:00. That will make it easier for oil to come up and out the rockers and down to the adjusting screws, push rods, lifters, and cam. Also which to green dot rubbers on injector lines. Very best of luck!!!
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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Posted By: HudCo
Date Posted: 19 May 2025 at 10:48pm
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one bad injector will take out a piston pretty quick and somthing wrong with the valve lash will hammer a push rod a part and ruin the cam so i would be for checking the injectors and valve train soon we are doing a 504 case engine some messed up the overhead so now its a out of frame major
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