On Jan 30, 8:44*pm, Harry wrote:
On 1/30/10 8:40 PM, Tim wrote:





On Jan 30, 3:04 pm, *wrote:
On 1/30/10 3:47 PM, Tim wrote:

I'm looking at another boat. A 19 ft bowrider *trihull. the boat
itself is in great condition but the 100 hp. v-4 Evinrude has ow
compression on one cyl. they burned up a starter trying to get it
running. they got a starter put on and found out one cycl. is low.
Didn't say how low, but it's still not up with the other 3. They were
thinking on fixing it, but decided to get another boat and so they're
wanting to sell this one. Cheap! *i mean, the lower end on the engine
is probably what they want for the whole thing... Cheap!

I know that that to repair the engine is going to cost something. It
could be anything from a bad ring to a scored piston and cylinder. ,
But I'm not too worried about it because I have a 115 v-4 in my garage
with a one year old power head. But I'd rather see how bad the engine
actually is before I swapped it out. If a cylinder is scored that's
one thing, but if it needs a piston and/or rings that's another.

I don't know much about the v-4's but can you pull a piston without
having pull the flywheel and split the casings etc?

The engine is a 1979 Evinrude Javilin squared hood.

just curious.

If you look on this site, assuming the URL works:

http://shop2.evinrude.com/ext/index....f41179a6c0e561....

You're see an exploded view of that powerhead.

I don't see how you can remove a piston without splitting the casings.
How would you get to the wrist pin?

Here's the piston drawing:

http://shop2.evinrude.com/ext/index....f41179a6c0e561....

The way i see it, if you can remove the intake manifold, and *a plate
(if there is such a *thing) off the bottom (crank side) of the engine
and get to the connecting rod and pull the nuts from the bottom of the
rod, and take the head[s] off, you should be able to push the piston/
conrod through the top of the engine, like you would *on most
reciprocating engines.

Well...there's every chance you could be right!

You're also assuming, I would guess, that a frozed or damaged piston and
rings are the only problems in that powerhead. It's 30 years old.
Restoring it to operating condition may well take a lot of time and a
significant amount of $$$. Oh...the gearcase could be shot, too.- Hide quoted text -

- Show quoted text -

IF the piston was "frozed" it wouldn't turn over, dummy. Therefore, no
one would know if it had low compression on one cylinder.