Powerhead Rebuild

[lakerat2403]

I have a tired 35hp Evinrude that needs rebuilding. I was looking at using TMS (Tenkiller Marine Services) out of Oklahoma. Does anyone have any experience good or bad with these guys? Any other recomendations would be a big help! Thanks for any opinions/advice.
Rick

 

[jonesg]

Re: Powerhead Rebuild

Get the manual, DIY.

 

[iwombat]

Re: Powerhead Rebuild

It's really unusual that an outboard gets enough use to just wear out. It does happen, or so I'm told, but I have yet to see one. They almost always catastrophically fail before they are in need rebuilding. What are they symptoms that are causing you to think it's due for a rebuild?

 

[lakerat2403]

Re: Powerhead Rebuild

thanks iwombat.
The motor is a 84 eninrude 35 E35TELCRR. It is on a 16 ft Alumncraft that I use for fishing and pulling the kids around on a tube. The rig is just powerful enough to give the kids a decent ride. It would run at 5900 rpm and 22mph. Last fall it started acting a little sluggish while pulling the tube. The rpm dropped to 5300 and the idle was a little erratic. Checked compression and had 103 on #1 and 125 on #2. Tried a decarb with no help. Pulled the head and it looks like normal wear to me. Also one of the bearings on #1 feels loose. I am a retired auto mechanic and just learning about these 2 strokes but it appears these compression reading are pointing to a rebuild. The rest of the engine is in good shape so this seems the way to go. I can't afford a new one and and used you never know what you will get.
Rick

 

[iwombat]

Re: Powerhead Rebuild

I think it's pointing to a head gasket more so than a rebuild. If it's compressing over 100psi it's not likely to be worn out. Remove the intake covers and check out the rings. Make sure they're floating in the grooves and not stuck. Also check the skirts for scoring. If it were mine, I'd dress the head, put on a new head gasket and see what the readings came out as before cracking open the cases.

 

[wbeaton]

Re: Powerhead Rebuild

I think it's pointing to a head gasket more so than a rebuild. If it's compressing over 100psi it's not likely to be worn out. Remove the intake covers and check out the rings. Make sure they're floating in the grooves and not stuck. Also check the skirts for scoring. If it were mine, I'd dress the head, put on a new head gasket and see what the readings came out as before cracking open the cases.

I think that's reasonable advice.

 

[lakerat2403]

Re: Powerhead Rebuild

Thanks guys,
When I looked at it this spring I found a stud from the bracket that holds the rectifier had fallen out. The stud penetrates the crankcase which caused an airleak. Probably was idle problem. Anyway I pulled the head to check for damage and found glazing and what looks like normal wear to me. I dressed the head on plate glass with emery cloth (it was slightly warped) and reinstalled with a new gasket. The readings may have increased a pound or so but basically stayed the same. I will pull the covers, check the rings and skirts and let you know. Thanks again, you guys are a big help.
Rick

 

[lakerat2403]

Re: Powerhead Rebuild

Well I pulled the covers and the rings are nice and loose. The skirts don't look scored. Actually it looks great inside. What do you think? The 22 psi difference in compression seems high from what I have read. It just doesn't have the oomph to get the tube on plane anymore. If I was not pulling a tube I probably would not notice the power loss. I think that fixing the stud would have taken care of the idle problem but not being on the water I can't be sure. What next? Thanks
Rick

 

[wbeaton]

Re: Powerhead Rebuild

Well I pulled the covers and the rings are nice and loose. The skirts don't look scored. Actually it looks great inside. What do you think? The 22 psi difference in compression seems high from what I have read. It just doesn't have the oomph to get the tube on plane anymore. If I was not pulling a tube I probably would not notice the power loss. I think that fixing the stud would have taken care of the idle problem but not being on the water I can't be sure. What next? Thanks
Rick

Did you replace the stud before compression testing or removing the head? A hole in the crankcase will cause a loss of compression.

 

[wilde1j]

Re: Powerhead Rebuild

The RPM drop may be due to carb crap. I'd be inclined to clean/rebuild the carbs. The compression results shouldn't cause a noticeable RPM drop, but do indicate one cylinder being a little more worn.

I would periodically monitor compression, but wait a little longer before a rebuild.

 

[lakerat2403]

Re: Powerhead Rebuild

Yes, I did fix the stud problem before any further testing was done. I also disassembled and cleaned the carb but found it was perfectly clean. I run Stabil all the time in everything as I think it helps. I had done a lot of preliminary testing going off of what I had read here, but I did not want the original post to go on & on. I figured I would answer questions as they came up. I do not want to rebuild but if it is in the cards soon I might as well do it now while it is apart. Main thing is I want to pull the kids on the tube which it will barely do now. I don't have the clean space to try this on my own, unfortunately, so I need to have it done. I was hoping the outcome would have been better. You guys have been a great help. So back to my original question of any opinions on these guys (TMS)from Oklahoma good or bad? Any other options would be cool too. Thanks very much again. By the way I do have a manual. First thing I always do.
Rick

 

[wbeaton]

Re: Powerhead Rebuild

Cheaper to buy another good used one than to have it rebuilt.

 

[dub1464]

Re: Powerhead Rebuild

I have a tired 35hp Evinrude that needs rebuilding. I was looking at using TMS (Tenkiller Marine Services) out of Oklahoma. Does anyone have any experience good or bad with these guys? Any other recomendations
i had a 110hp johnson rebuilt by tmc 2 yrs ago they did a excellent job never has run better or stronger would highly recomend

 

[retiredfornow]

Re: Powerhead Rebuild

Maybe the kids are just a lot bigger this year? Couldn't pass that up. Good luck!

 

[Daviet]

Re: Powerhead Rebuild

You know that this post is almost two years old. You should really start a new post.