97 OMC 115JTED (NorthStar Blast) shut down after running a few minutes of
tubing, engine
cover taken off to notice a smoking hot, pressurized rubber exhaust tube
running from muffler to exhaust port on transom? Any ideas what might have
caused this? Was able to restart after a few minutes and ran well. No beep
alarm sounded either.

Smoking due to rubber burning? Or did water get on it. Generally
exhaust can be hot but it should not be so hot that you can't hold your
hand on it for a few seconds.

Your cooling water is dumped into the exhaust after it cools the
engine. 1997 is long enough that if you have had nothing replaced
things could be starting to fail. It would depend on hours and amount
of fresh water verses salt water use. The hot exhaust combined with
water corrodes the exhaust system and that sometimes results in pieces
clogging it. You did not say what the engine temp was. If the engine
was overheating that tends to also cause the exhaust to overheat.

Northstar wrote:
97 OMC 115JTED (NorthStar Blast) shut down after running a few minutes of
tubing, engine
cover taken off to notice a smoking hot, pressurized rubber exhaust tube
running from muffler to exhaust port on transom? Any ideas what might have
caused this? Was able to restart after a few minutes and ran well. No beep
alarm sounded either.

There is a ~3" rubber hose tapped off to one side and another that seems to
run to the base of the motor at the back right next to the muffler. After
about 5mins, the RPM drops, overheating and bulging of that hose is what
seems to be apparent. The smoke came from the plastic blower hose that
started to melt because it sits on that rubber hose. Could it be a bad
impeller or impeller drive shaft? It has been noisy with a rattle last few
weeks, specially noticeable at idle. The engine is very low hours all fresh
water and was very strong until this.


"jamesgangnc" wrote in message
oups.com...
Smoking due to rubber burning? Or did water get on it. Generally
exhaust can be hot but it should not be so hot that you can't hold your
hand on it for a few seconds.

Your cooling water is dumped into the exhaust after it cools the
engine. 1997 is long enough that if you have had nothing replaced
things could be starting to fail. It would depend on hours and amount
of fresh water verses salt water use. The hot exhaust combined with
water corrodes the exhaust system and that sometimes results in pieces
clogging it. You did not say what the engine temp was. If the engine
was overheating that tends to also cause the exhaust to overheat.

Northstar wrote:
97 OMC 115JTED (NorthStar Blast) shut down after running a few minutes of
tubing, engine
cover taken off to notice a smoking hot, pressurized rubber exhaust tube
running from muffler to exhaust port on transom? Any ideas what might
have
caused this? Was able to restart after a few minutes and ran well. No
beep
alarm sounded either.