JohnH wrote:
If you read the initial 'bad day on the bay' post, you are aware that I had a
problem last Friday.

Inspected the boat on Monday. Found the cause of the smoke to be the overheating
of the insulation on the wiring harness which was laying on the exhaust elbow.
(Probably done by the manufacturer.) Also, the lack of water going through the
starboard exhaust caused the rubber section of exhaust pipe just below the elbow
to melt out, The smoke was due to all the melting rubber.

I removed both sets of risers and manifolds and the other damaged parts on the
starboard side of the engine (5.7L Mercruiser). The wiring harness was
repairable. The riser didn't have an obvious plug.

When the manifold was removed from the starboard side, I noticed a discoloration
in the exhaust port of the third cylinder from the front. By discoloration, I
mean a reddish (rusty) color. I didn't feel it, at the time, but today the
mechanic at the marina said it was wet when he looked at it a day later. The
mechanic didn't do anything further than look at it and feel the wetness with
his finger. I also, today, felt the same port on the manifold, and it was also
wet.

The mechanic wants to run a compression check on Monday. Now I'm concerned that
what I thought was a plugged up riser may be something much more serious.

Questions:

What could cause a wet exhaust port on one cylinder?

If there is a problem with that cylinder, how could it have prevented water from
going through the riser?

If I try to pour water through water channels in the riser, and it either comes
out or doesn't, can that diagnose a plugged riser?

The engine didn't sound like it was missing. On Monday we'll start it and see
what comes out of that exhaust port. (Without manifolds and risers, that should
be a disquieting experience!)

Thanks for any help. Smart assed comments about my lack of V8 expertise will
also be accepted.

John H

On the 'Poco Loco' out of Deale, MD,
on the beautiful Chesapeake Bay!



Too bad you're such an asshole...if you weren't, I'd be glad to loan you
Yo Ho while I'm out of town.




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