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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Exhaust waterline question?
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Thread: Exhaust waterline question? Reply to Thread
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Topic Review (Newest First)
11-14-2012 01:31 PM
SlowButSteady
Re: Exhaust waterline question?

Quote:
Originally Posted by Brent Swain View Post
I have keel cooling and dry exhaust. Wet exhaust is a major cause of engine failure.
I thought about switching to a dry exhaust and keel-cooler at one time. But the idea of having a hot exhaust pipe running through the engine compartment makes me a bit nervous.
11-14-2012 01:18 PM
Barquito
Re: Exhaust waterline question?

Some boats squat when under power because at hull speed the stern is in the trough and the bow is climbing the bow wave. Backing off a little may ease the squatting and save fuel. OTOH, I alway feel better after a good squat.
11-14-2012 12:33 PM
ltgoshen
Re: Exhaust waterline question?

Quote:
Originally Posted by chef2sail View Post
Definately needs tightening. It is supposed to DRIP about 7 DROPS when the shaft is spinning.
Noted. I tightened it up Sunday. Thanks for the tip
11-12-2012 07:01 PM
Brent Swain
Re: Exhaust waterline question?

Quote:
Originally Posted by ltgoshen View Post
How do you know if your impeller stops pumping water if you cant see it spitting?
I have keel cooling and dry exhaust. Wet exhaust is a major cause of engine failure.
11-11-2012 07:47 PM
chef2sail
Re: Exhaust waterline question?

Definately needs tightening. It is supposed to DRIP about 7 DROPS when the shaft is spinning.
11-11-2012 07:35 PM
ltgoshen
Re: Exhaust waterline question?

Here is a short video if it while under way. This was today in Beaufort, I was at 2000 RPM's is if it looks too wet in the shaft



11-08-2012 02:38 PM
ltgoshen
Re: Exhaust waterline question?

Will do. I have a very dry bilge
11-08-2012 11:55 AM
msmith10
Re: Exhaust waterline question?

Stuffing box looks good, double clamps and all. If it drips when the transmission is in neutral, I'd try tightening it a tiny bit and see if that stops it.
11-08-2012 11:26 AM
ltgoshen
Re: Exhaust waterline question?

Quote:
Originally Posted by msmith10 View Post
You're right to do check for water flow every time you start the engine. I suspect that the alarm comment was a bit of sarcasm. Most A4s don't have alarms installed, although they're a good idea as they'll also warn you about low oil pressure. The most common mistake I make when starting (always while sailing, not leaving the dock) is to leave the choke closed. After a few minutes I notice the engine is running very rough. It then takes a while to burn the fouling off once I open the choke. I need to install some kind of "choke alarm."
I noticed you said that your stuffing box leaks at idle. Is this all the time, even when the engine is off? If so, the packing nut probably needs to be tightened a little bit. The short version is, it should not leak when the shaft is not turning but should drip a little when the shaft is turning. If the packing nut is too loose, it will leak at idle. If it's too tight, it will overheat and the packing may be so tight that it scores the prop shaft, making it impossible to get a good seal in the future.


Well it drips with the engine running in netrual maybe 5 or 7 drops a min. Cant tell when in gear but its not too much. Should it be tighten up?
My engain is a 2gm Yanmar 13 hp. it has no choke on it. It starts up with the greatest of ease. No-choking a diesel right? Here is the packing I just had it repacked at Marsh harbor boat works.
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11-08-2012 08:07 AM
msmith10
Re: Exhaust waterline question?

You're right to do check for water flow every time you start the engine. I suspect that the alarm comment was a bit of sarcasm. Most A4s don't have alarms installed, although they're a good idea as they'll also warn you about low oil pressure. The most common mistake I make when starting (always while sailing, not leaving the dock) is to leave the choke closed. After a few minutes I notice the engine is running very rough. It then takes a while to burn the fouling off once I open the choke. I need to install some kind of "choke alarm."
I noticed you said that your stuffing box leaks at idle. Is this all the time, even when the engine is off? If so, the packing nut probably needs to be tightened a little bit. The short version is, it should not leak when the shaft is not turning but should drip a little when the shaft is turning. If the packing nut is too loose, it will leak at idle. If it's too tight, it will overheat and the packing may be so tight that it scores the prop shaft, making it impossible to get a good seal in the future.
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