Exhaust Elbow Clogging Frequently

svnakia · 12-04-2009, 06:49

I have a Yanmar 3QM 30 with the U shaped exhaust elbow.

I just finished cleaning out the elbow because of clogging (I'm getting pretty good at telling when it's getting clogged, the engine temp starts going up just a little). This was a new elbow about 2 years ago.

It seems to me that this ought to last longer then a couple years. FWIW, we cruise full time, there are about 700 engine hours on this elbow (crap that's a lot of motoring :-)

Is there something else in the exhaust system that I should be looking at? Maybe the elbow needs to be higher? Maybe there's too much or not enough water flowing in the anti-syphon bypass? Maybe there's a restriction further down the exhaust system?

Or maybe getting 2 years out of an elbow is about right?

Any thoughts would be greatly appreciated.

Before:
Picasa Web Albums - John and Linda - exhaust elbow

After:
Picasa Web Albums - John and Linda - exhaust elbow

12-04-2009, 06:49	#1
svnakia Registered User Join Date: Oct 2007 Location: Mexico Boat: Hans Christian 33 NAKIA Posts: 28	Exhaust Elbow Clogging Frequently I have a Yanmar 3QM 30 with the U shaped exhaust elbow. I just finished cleaning out the elbow because of clogging (I'm getting pretty good at telling when it's getting clogged, the engine temp starts going up just a little). This was a new elbow about 2 years ago. It seems to me that this ought to last longer then a couple years. FWIW, we cruise full time, there are about 700 engine hours on this elbow (crap that's a lot of motoring :-) Is there something else in the exhaust system that I should be looking at? Maybe the elbow needs to be higher? Maybe there's too much or not enough water flowing in the anti-syphon bypass? Maybe there's a restriction further down the exhaust system? Or maybe getting 2 years out of an elbow is about right? Any thoughts would be greatly appreciated. Before: Picasa Web Albums - John and Linda - exhaust elbow After: Picasa Web Albums - John and Linda - exhaust elbow

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