Seafoarm Decarbonizing... Overheating WOT????

[jtsailjt]

Re: Seafoarm Decarbonizing... Overheating WOT????

warped cylinders that overheat at high throttle settings?....What?, I have heard of a choked bore and seen wash boarded cylinders from overheat but a warped bore? i could be wrong but you may have been taken to the cleaners.

I really don't know if warped, choked, or washboarded is the correct term to describe what happened to my motor, but after the first overheat which was caused by a bread bag in the water combined with a bad overheat sensor, even though everything seemed fine visually and at low throttle settings, at high throttle settings, it always got hot after about 30" of running. I was reluctant to accept that diagnosis too, especially since I was the one writing the checks for repairs, so before I junked it, took it to a second shop and they checked out everything the first shop had done/said and came to the same conclusion and he didn't even want to buy it as a parts motor so I sold it to a third shop. I hope that this is not the same problem the OP is currently having, but thought it worthwhile to relate for him to consider before he spends tons of money on a motor that may be beyond repair without a major rebuild.

 

[ngentile]

Re: Seafoarm Decarbonizing... Overheating WOT????

I appreciate the comparison. The only comment I can make on your situation is that there was no "major event" between the time I could go WOT for hours upon end --> untill now except for a major decarb in which I ran potent seafoam enriched fuel through the carb possibly cloging my highspeed jet which could be causing my engine to run to lean hence overheating, or just not having enough fuel to match the incoming air.

At anyrate - the motor never died due to heat or overheat alarm go off or anything. The only thing I noticed was semi/hot water coming out of the pee hole at WOT which I never checked prior to. I'm going to rebuild carb and fuel pump and then go from there.

Thanks Again

 

[jtsailjt]

Re: Seafoarm Decarbonizing... Overheating WOT????

Yes, there definitely are differences in our situations and I do hope that your current problem is a clogged jet or something similar that's making your engine run too lean. It sounds quite likely. I just wanted to point out that ONE symptom of overheating is a loss of thrust caused by a loss of compression, especially once you open the throttle a bit. As you point out, you have no reason to believe that your motor ever was overheated to the extent mine was the first time, so the likelihood of having warped cylinders is probably pretty slim. I'd say that my experience is something to possibly consider when/if you've exhausted explanations having to do more directly with fuel delivery to cause your motors current behavior.

Once you do discover the cause, please post just what you learn. So many of these threads identify a problem and then have some discussion about possibilities, but then just end without any statement of exactly what turned out to be the problem so it's tough to learn from them.

 

[ngentile]

Re: Seafoarm Decarbonizing... Overheating WOT????

UPDATE: I pulled carb off... tore it down, cleaned every piece, started pouring some carb cleaner into all the holes... sure enough the high speed jet would not allow cleaner to drain through. Took my air compressor spout and blew some high pressure air through the hole, poured some more cleaner in it - and it flowed right throught.

I have a hunch that my high speed jet was clogged - courtesy of the potent seafoam treatment.

Won't know for sure until I take it out. I'll probably be testing it this thursday evening. Will update.

 

[jtsailjt]

Re: Seafoarm Decarbonizing... Overheating WOT????

UPDATE: I pulled carb off... tore it down, cleaned every piece, started pouring some carb cleaner into all the holes... sure enough the high speed jet would not allow cleaner to drain through. Took my air compressor spout and blew some high pressure air through the hole, poured some more cleaner in it - and it flowed right throught.

I have a hunch that my high speed jet was clogged - courtesy of the potent seafoam treatment.

Won't know for sure until I take it out. I'll probably be testing it this thursday evening. Will update.

update?

 

[hdman97]

Re: Seafoarm Decarbonizing... Overheating WOT????

Maybe the seafoam loosened up some crud in your fuel tank or line
which lodged in the carb.

 

[ngentile]

Re: Seafoarm Decarbonizing... Overheating WOT????

Sorry... vacation..been busy. Definitly a clogged jet. It was not over heating... Rebuilt carb from top to bottom. No more loss of high end power. Runs good.

HOWEVER:

NOW i have a smoking and very rough idling issue. Had to adjust idle throttle much higher than the norm. I think my fuel/oil ratios could be off. (too much oil). Will test tomorrow.

I'm still kicking myself for doing this seafoam clean... I feel as if the carbon buildup was so significant that the engine was somewhat reliant on the carbon buildup. The seafoam "shock" knocked so much loose my engine is in shock and lost compression and constantly belching smoke and konking out under normal idling conditions and settings.

dunno.. will keep testing... input welcome

 

[chum1]

Re: Seafoarm Decarbonizing... Overheating WOT????

Sorry... vacation..been busy. Definitly a clogged jet. It was not over heating... Rebuilt carb from top to bottom. No more loss of high end power. Runs good.

HOWEVER:

NOW i have a smoking and very rough idling issue. Had to adjust idle throttle much higher than the norm. I think my fuel/oil ratios could be off. (too much oil). Will test tomorrow.

I'm still kicking myself for doing this seafoam clean... I feel as if the carbon buildup was so significant that the engine was somewhat reliant on the carbon buildup. The seafoam "shock" knocked so much loose my engine is in shock and lost compression and constantly belching smoke and konking out under normal idling conditions and settings.

dunno.. will keep testing... input welcome

Its probably a good shock and just needs adjustment now, my 850 started sloughing off big clumps of carbon sludge now that its running right, I noticed a chunk lodged in the lower end exhaust, It may be the ethanol in the fuel that's acting like a degreaser

 

[jhcreech]

Re: Seafoarm Decarbonizing... Overheating WOT????

have u verified it is overheating, normal temp is 170-180, putting your hand on the engine at this temp can burn, the telltale will be hot because water cools the exhaust plate and their is heat transfer to the water so water will be hotthen the cooling water around the cylinder walls will have heat transfer so the water again will be hot, do not over think the problem get the facts, know water the actual temp is.
carbon build up on the pistons would increase the compression and also heat, the seafoam should be used at one can to 16 gallons of fuel and if u smell the seafoam product it smells like rubbing alcohol mainly for water removal. Infared thermometer is a very useful tool to check the motors temp, good luck to you...

 

[jtsailjt]

Re: Seafoarm Decarbonizing... Overheating WOT????

Sorry... vacation..been busy. Definitly a clogged jet. It was not over heating... Rebuilt carb from top to bottom. No more loss of high end power. Runs good.

HOWEVER:

NOW i have a smoking and very rough idling issue. Had to adjust idle throttle much higher than the norm. I think my fuel/oil ratios could be off. (too much oil). Will test tomorrow.

I'm still kicking myself for doing this seafoam clean... I feel as if the carbon buildup was so significant that the engine was somewhat reliant on the carbon buildup. The seafoam "shock" knocked so much loose my engine is in shock and lost compression and constantly belching smoke and konking out under normal idling conditions and settings.

dunno.. will keep testing... input welcome

After reading about your experience, I've been checking out a couple of other forums to see what they have to say about doing this to your engine. It seems to be almost universal that it helps engine performance and should be done periodically, but one thing that's frequently mentioned is for badly carboned-up engines to allow the engine to sit with the Seafoam in the cylinders for a longer time to allow all the crap to get liquified. I've read everything from 15 minutes to overnight. Not sure what's best? Then run the engine in the water in gear, so it's under some load, at moderate throttle settings until it stops smoking. Not sure how long you allowed it to sit or if that really is an issue, but thought it might be a valid reason for your problem with chunks instead of just gunk coming out.