Seafoam in outboard

[Bogger]

Johnson 90hp V4

Compression 1-100, 2-105, 3-105, 4-110

Boating forum suggests using seafoam to decarbonate. Most guys are adding 1 can to 1 gallon and running the engine to temp.

I have the seafoam spray and some suggest pulling the plugs and spraying it right into the cylinders. I do not intend on running the motor for a few weeks when I get the floor redone and pull it outside, right now it's in my heated barn.

Question I have is can I spray it into the cylinders, turn it over to move the pistons then let it sit until I'm ready to water test it in a few weeks to a month, or should I wait until I'm ready to run the motor up to temp on muffs.

I just don't want to Fawk anything up, the compression is much better than I was expecting and research tells me with a seafoam treatment I may be able to get all four back up close to the 120psi spec.

 

[neilsleder]

Johnson 90hp V4

Compression 1-100, 2-105, 3-105, 4-110

Boating forum suggests using seafoam to decarbonate. Most guys are adding 1 can to 1 gallon and running the engine to temp.

I have the seafoam spray and some suggest pulling the plugs and spraying it right into the cylinders. I do not intend on running the motor for a few weeks when I get the floor redone and pull it outside, right now it's in my heated barn.

Question I have is can I spray it into the cylinders, turn it over to move the pistons then let it sit until I'm ready to water test it in a few weeks to a month, or should I wait until I'm ready to run the motor up to temp on muffs.

I just don't want to Fawk anything up, the compression is much better than I was expecting and research tells me with a seafoam treatment I may be able to get all four back up close to the 120psi spec.

You troll with it lots while fishing? They carbon up bad like that. I would pull the plugs and put some sea foam in the cylinders and just let it sit till you can run it on the muffs. Be nice if that works

 

[tex78]

Not sure how long ya want it to sit

Would think 5-6 hours

Ya also want it some what warm if ya spray it, and would spary some when running into the t body

Being that the engine is on its side, and even tipped up, will not get into the rings just sitting there


Gm used to sell this good chit that we used on the oil burning ones, to clean out the oil rings and such, but they don't make it any more

I have two bottles, but its the best thing to clean diesel injectors out too, ive been offered few hundred bucks a bottle lol

 

[Bogger]

Thanks tex.... I think I will wait until I'm closer to start-up. Spray the chit out of the cylinders with seafoam, let it sit for a couple hours then run a gallon of 5:1 fuel to seafoam through it. I don't want to spray down the cylinders then have it sit for weeks with the residue in the cylinders.

 

[Crustyolddude]

Good points. I run mystery oil in all my motors. Cup of oil every fill vehicle, add it to sled, boat tank, ATV , Chain saw. It cleans out carb, injectors, and slowly breaks down the carbon buildup on the valves, or top of piston. also added a mix mystery oil, and sea foam mix, didn’t notice any difference. Also add liter Mystery oil to my oil.