De Carboning an engine

[colofiremedic]

At one time I saw a procedure for decarboning an engine posted on here. It used 16oz Sea Foam, 1 gallon of gas and 3 oz of oil. I am wanting to do this on my engine however I am not sure if there are any risks involved. such as loosing compression or worse. If anyone knows where the link to the earlier mentioned thread is or has any advice regarding de carboning an engine please let me know. I have a 1990 Johnson 88SPL. Dont know how many HRS are on it. It still runs good and starts every time but it does not run as strong as it used to. Compression is good and fairly equal in all cylinders.

Thanks

 

[tashasdaddy]

Re: De Carboning an engine

as you know i have the 1988 88spl i use 12 oz to 3/4 gallon and put 4 oz in a spray bottle. this way i can do the deep creep method. deep creep is the aerosol version of seafoam, same stuff. start the engine on the mixture of oil, gas and seafoam. bring up to temp. remove plugs and spray seafoam into cylinders, replace plugs. wait 10-15 minutes. start engine with the air silencer removed. now spray seafoam into the carb until the engine almost stalls. keep it up until the engine quits smoking. the smoke is the crud being removed from the engine. replace the plugs with new ones. and from now on add seafoam according to the directions to your fuel/oil mix, should only have to be done every year or two. has been known to raise compression and will definately clean and free up rings. i do this to all my engines once i get them running. also lawn mower, weedeater, etc. in the fuel also keeps the carbs clean.. i think the post you are actually looking for is in the engine faq forum.

 

[colofiremedic]

Re: De Carboning an engine

Thanks, I'll give it a try tomorrow morning. Should I use a 55 gal drum of water or the muffs. I have read some horror stories on this site re: the engine muffs and runaways. I am a little nervous running the muffs for anything other than an occasional flush of the cooling system.

 

[ezeke]

Re: De Carboning an engine

The decarb articles and a lot of other helpful articles are on the engine FAQ forum on this site. Here is the link:

http://forums.iboats.com/showthread.php?t=158076

If you run several treatments with a run on the water in between, it does a much better job.

If you look at the BRP/Evinrude web site maintenance schedule, it says to decarb your engine annually or every 100 hours:

http://www.evinrude.com/en-US/About.Us/FAQ/Maintenance.htm

 

[colofiremedic]

Re: De Carboning an engine

Just a little update on the decarboning prject. It worked better than I anticipated. I gained compression in all cylinders (2 to 3 points), the motor starts and idles much better. On the lake it comes to full RPMs' a lot faster and runs out at WOT better. What a difference a can of Sea Breeze can make. Thanks again for all of the input. I appriciate all of the patient souls that answer questions from rookie boaters. The boat is completely rebuilt, looks great and runs awsome. Now that my project is finished I'm headed to the lake. Thanks again for all the help and advice!