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8550 engine
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TrentH View Drop Down
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Joined: 05 Mar 2025
Location: Minnesota
Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TrentH Quote  Post ReplyReply Direct Link To This Post Topic: 8550 engine
    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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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21461 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2025 at 8:04pm
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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TrentH View Drop Down
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Joined: 05 Mar 2025
Location: Minnesota
Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TrentH Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2025 at 8:15pm
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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Unit3 View Drop Down
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Joined: 17 Oct 2009
Location: NC Iowa
Points: 5575 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Unit3 Quote  Post ReplyReply Direct Link To This Post Posted: 20 hours 33 minutes ago 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!!!
2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3820 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 8 hours 55 minutes ago at 10:48pm
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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