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Old 01-05-2019, 14:34   #1
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OM 636 Exhaust is Dry

Just bought this 1978 37' Steel Ketch. Mercedes OM636 Marine Engine Starts OK...But no water is coming out the exhaust... Instead...All the water is getting expelled out my bottom Portside Cockpit Scupper Pipe.
Has anyone ever experienced this?
Maybe a valve is not positioned Properly?
Lots of water coming out the Port side Scupper pipe at the Bottom... No water coming out the Exaust at all.
Please help me correct this if you can.
Thank You
Denis
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Old 01-05-2019, 16:17   #2
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Re: OM 636 Exhaust is Dry

Question 1.

Is the exhaust made of steel pipe and heavily insulated?

2. If #1 is no, is the exhaust made of rubber hose?

3. If #2 is yes, is there a water/gas separator above the water lift muffler?

Dry exhaust isnt normal for pleasure craft, but its not really odd either. I suspect you have a dry exhaust.
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Old 02-05-2019, 03:54   #3
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Re: OM 636 Exhaust is Dry

Greetings and welcome aboard the CF, Denis.
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Old 02-05-2019, 16:51   #4
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Re: OM 636 Exhaust is Dry

Quote:
Originally Posted by Sailmonkey View Post
Question 1.

Is the exhaust made of steel pipe and heavily insulated?

2. If #1 is no, is the exhaust made of rubber hose?

3. If #2 is yes, is there a water/gas separator above the water lift muffler?

Dry exhaust isnt normal for pleasure craft, but its not really odd either. I suspect you have a dry exhaust.
Thanks Sailmonkey!
I Found the Problem!!!
The anti syphon u shaped pipe Had an overflow hose at the Top that went to the portside Scupper!!!
We pinched that small hose and the Scupper stopped pouring out the water and water started leaking out the back at the Exhaust port slowly... So I
Opened up the Heat Exchanger and pulled out the exchanger tube and the tubes are all clean that the engine coolant runs thru.
But the Salt water Cooling side has a large build up of baked Salt Gunk.
I have it Soaking in Vinegar right now.
Thanks for Replying Sailmomkey
Denis7p
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Old 02-05-2019, 17:04   #5
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Re: OM 636 Exhaust is Dry

Thank you
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Old 02-05-2019, 17:52   #6
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Re: OM 636 Exhaust is Dry

Very good!!

If you can, grab a bottle of CLR or radiator cleaner. You could die of old age before the vinegar really clears anything.
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Old 02-05-2019, 19:04   #7
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Re: OM 636 Exhaust is Dry

OK
Thanks
CLR tomorrow!!!
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