Engine keeps running on, or dieseling - Seafoam fix?

Farmall M, Super M, 400, 450 & 560 Tractors, 1939-1963

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501 Club
501 Club
Posts: 640
Joined: Sat May 07, 2016 5:13 pm
Zip Code: 45380
Tractors Owned: 1952 Cub w/ 184 motor (Kid)
12V with Petronix
IH 3160 Mower Deck
54 Leveling Blade
193 Plow
IH528 Trailer
Front/Rear Weights
Farmall 300 (Clarence)
12V with Petronix
Woods L306 72"
Circle of Safety: Y
Location: Versailles, Ohio

Re: Engine keeps running on, or dieseling - Seafoam fix?

Postby ShawnAgne » Tue Oct 17, 2017 10:10 am

I made a siphon out of a ball inflation needle and hose that I attach through the small screw of the manifold. Have used it on the original Cub motor and the 300 and it does blow out a lot of black stuff. I think I may do it again on the 300 as I pulled the 386 plugs after doing the conversion to 12V and they were heavily coated in black crud.
Shawn Agne

501 Club
501 Club
Posts: 1095
Joined: Thu Mar 09, 2017 4:06 pm
Zip Code: 06405
Tractors Owned: 1957 Cub
1950 Cub
1951 Super C
1966 IH 504 Hi-Clear
1968 JD 3020
1949 Ferguson TO-20
1955 Ferguson TO-35
Location: Branford, CT

Re: Engine keeps running on, or dieseling - Seafoam fix?

Postby ajhbike » Sun Dec 10, 2017 7:47 pm

I had trouble with rough running on my cub. I put a tablespoon in each spark plug hole, cleaned and gapped the plugs and reinstalled them. Then I colored the dosage and put some inn the oil. I probably ran it 5 hours total in the next 2 weeks and changed the oil. It helped smooth things out allot.
I also put it in the gas every so often of all 3 tractors, chain saws, lawn mower, snow blowers and after the smoke clears, things seem to run better

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