Exhaust/Water expelled out one side & slapping sound while in reverse (again)
 

I made a post a few weeks ago and after bringing the boat to my local marine
mechanic noticed the following...... I have a 94 Chaparral w/ a 5.7
Mercruiser. I have recently noticed that when flushing the system (on the
earmuffs) the exhaust/water comes out of only one side at the bottom near
the transom plate. It trickles out the other side. I could have swore that
last season it came out both sides but don't know 100%, is this normal? The
mechanic said that this is normal because when running on the muffs there is
not enough water intake and that it comes out one manifold down the exhaust
and shoots out only one side. My exhaust flaps are intact and there is no
obstruction at the bottom of the exhaust.

Next question is... again while on the earmuffs and i pop it into reverse at
a slow idle, i hear a slapping sound, the marine said that is normal, they
adjusted the lower shift cable. Just was wondering if anyone has the same
experience.

Thanks! !

-Matt

It's normal for there to be a noticeable difference in quantity between
the R/L ports while on the muffs. However, there should NOT be just a
trickle from one. While running on the muffs, feel the tops of both
risers and the elbows. If the low flow side is hotter than the other,
there is not enough water flowing in that manifold. If increasing the
water pressure to the muffs doesn't help, you may have a clogged
manifold on that bank, a restriction in the feed pipe, or a failing raw
water pump. You need to resolve the problem, because if the
manifold/riser is clogged, it will burn out the rubber elbows. VERY
unpleasant while underway miles from anywhere.
JR

ToneJohn wrote:

I made a post a few weeks ago and after bringing the boat to my local marine
mechanic noticed the following...... I have a 94 Chaparral w/ a 5.7
Mercruiser. I have recently noticed that when flushing the system (on the
earmuffs) the exhaust/water comes out of only one side at the bottom near
the transom plate. It trickles out the other side. I could have swore that
last season it came out both sides but don't know 100%, is this normal? The
mechanic said that this is normal because when running on the muffs there is
not enough water intake and that it comes out one manifold down the exhaust
and shoots out only one side. My exhaust flaps are intact and there is no
obstruction at the bottom of the exhaust.

Next question is... again while on the earmuffs and i pop it into reverse at
a slow idle, i hear a slapping sound, the marine said that is normal, they
adjusted the lower shift cable. Just was wondering if anyone has the same
experience.

Thanks! !

-Matt





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Home Page: http://www.seanet.com/~jasonrnorth

On Sat, 28 May 2005 09:14:28 -0700, JR North wrote:

It's normal for there to be a noticeable difference in quantity between
the R/L ports while on the muffs. However, there should NOT be just a
trickle from one. While running on the muffs, feel the tops of both
risers and the elbows. If the low flow side is hotter than the other,
there is not enough water flowing in that manifold. If increasing the
water pressure to the muffs doesn't help, you may have a clogged
manifold on that bank, a restriction in the feed pipe, or a failing raw
water pump. You need to resolve the problem, because if the
manifold/riser is clogged, it will burn out the rubber elbows. VERY
unpleasant while underway miles from anywhere.
JR

You are *so* right! [From one who's been there - and spent four hours behind a
BoatUS towboat!]

--
John H
On the 'PocoLoco' out of Deale, MD

"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
Rene Descartes (A true binary thinker!)

Standard I/O onboard emergency equipment: duct tape and some pieces of
roof flashing tin or pop cans. It aint pretty, but will get you back to
port without a tow.
JR

John H wrote:
You are *so* right! [From one who's been there - and spent four hours
behind a
BoatUS towboat!]



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Home Page: http://www.seanet.com/~jasonrnorth