Home › Forum › Ask A Member › 1956 15 hp Evinrude Model 15016
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jeff-register.
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August 27, 2016 at 7:04 pm #5078
I did a little more "checking out" on the Subject motor
that had the big mouse nest —
viewtopic.php?f=7&t=8424
It was lightly stuck and I easily freed it up the other day.
Decided to check compression today.
87 psi top cylinder
105 bottom cylinder
Pulled the little intake port covers. Didn’t see any
scoring on either cylinder, but light rust staining on the
top piston, so guessing that’s the one that caused it
to be "stuck". I probed the piston rings with a plastic
probe, and it does appear that the top rings may be
stuck.
I squirted some BRP Johnson / Evinrude "Tuner" on the
rings. I know this stuff is suppose to be sprayed "in"
a running engine.
Will it do anything as applied to free up the rings?
It has no spark, so I popped the flywheel off.
Coils look like new, and tested okay with the Ohm meter.
Points are not shiny, so guessing that’s the spark problem.
I tested the condensers and they read .31 and .32 MFD’s.
Are they way out of spec? I was guessing they’d be in the
.22 range.
Thoughts appreciated!Prepare to be boarded!
August 27, 2016 at 7:20 pm #42769Sometimes rings will free up with running and treatments. It’s worth a try, since you have enough compression to start it.
You could test the point resistance (closed). Should be nil. It it was mine I would burnish the points with some fine abrasive paper wrapped around a popsicle stick or "point file." (A bare point file is too coarse, IMHO). Then degrease with solvent on something like a business card. Check that max point gap is 0.020. Is the key in place so that magnet position is coordinated with point opening?
August 27, 2016 at 9:01 pm #42772Condensers are OK.
August 27, 2016 at 10:24 pm #42778Thanks for the replies. Will clean the points tomorrow and see if she sparks.
Is the BRP "tuner" meant to clean carbon from cylinders? I’ve never used it
before on a running engine. Can’t see where it would clean gunk inside
the carb if your spraying it in a running engine.
If I can get the old girl running I could try spraying the tuner in to
see if the rings loosen up.Prepare to be boarded!
August 27, 2016 at 10:52 pm #42783The engine tuner can certainly help free up stuck rings, but it is not a lubricant and shouldn’t be left inside the engine for more than a few days without starting it to expel the tuner.
I guess I would tilt the engine so the crank is as close to horizontal as possible, then move the #1 piston toward the top of travel and fill the cylinder with tuner…Let it sit overnight, then retest to see if your rings freed up any. Once you have the engine running, you can repeat this process a few more times after running the engine… You can pump the tuner into the carb while the engine is running as well, before filling the cylinder and letting it soak. Be sure to start the engine up and run it the next day. I’m sure the rings will free up and your compression will improve.
You should probably go a little heavy on the oil mix while doing these tuner treatments.August 28, 2016 at 1:32 am #42794Fleetwin, sounds like the tuner might be corrosive?
Thanks for the advice!Prepare to be boarded!
August 28, 2016 at 1:44 am #42796Buc, The OMC engine tuner is mildly corrosive. It should not be let the sit in a motor more than 2 or 3 days. Overnight is usually enough to get results from it. It is great stuff but it will cause corrosion if left to sit too long.
-BenOldJohnnyRude on YouTube
August 29, 2016 at 12:06 am #42857I took the points apart and cleaned them this afternoon. ( I hate those little
clips that hold the points on the post!) It had good spark after the cleaning,
so I did a quick timing job and threw the rest back together. Normally I’d
take the carb off an unknown engine and clean it, but I wasn’t sure when
I’d get a chance to work on it again and I wanted to see if it would run to
burn the engine "tuner" out of it. After a few pulls in the test barrel off
and away it went. Sure did smoke for a while with that tuner in the cylinders!
My pressure tank was literally on fumes, so I had to pump it every once in a while.
It ran pretty good for a compression imbalance of 18 psi. The rings on the top
piston still appeared to be stuck when I put the port covers back on.
Hopefully after a few running cycles they’re free up. I didn’t attempt to
tune in the carb. My test barrel won’t handle a 15 hp very well! I did
run it for about 10 minutes until it quit smoking bad, so I assume the
"tuner" is gone. When I get a chance, I’ll put it on my little Alumacraft
and give it a work out.
I assumed this "Froze up" Evinrude would be "parts", but it was a nice
surprise that it turned into a runner.Prepare to be boarded!
August 29, 2016 at 12:16 am #42858I always like those kinds of surprises! 😎
-BenOldJohnnyRude on YouTube
September 12, 2016 at 11:17 pm #43914I finally tried out the Evinrude 15 hp Fastwin on the
lake last evening. Wow, makes my little Alumacraft scoot
right along, especially when the largest outboard ran previously
on it was a 7.5 hp!Haven’t re-checked the compression yet to see if the rings freed
up on the upper cylinder, but will soon.It ran great about half the time, and the other half it was "fuel starved".
I have the carb off now. Found a little crud in the sediment bowl,
but otherwise not bad. It has one of those sintered, silver colored
filters in the sediment bowl. It doesn’t look bad, but
how does one tell if it’s plugged, and what’s the best way to clean one?
Are new ones available?I can’t find a carb "blow-up" with parts numbers to see what’s available
new for this carb, such as said sintered filter, needle packings, etc.
Anyone have the carb parts numbers for the
1956, model 15016?
Thanks!Prepare to be boarded!
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