dumb question

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John Reimann
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dumb question

I went to drain and replace the coolant on my M35B universal engine, but I can't find where to drain it from. Help!

SF Bay
1998 C36

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Channel Islander
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John, AFAIK you disconnect the lowest hose and drain from there. Did that on a powerboat I used to have, have not done it on my new C36 . . .

Nick Tonkin
*Former* Website Administrator, C36/375IA
*Former* owner, C36 tr/fk #255, Santa Barbara, CA

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John Reimann
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I know, but I can't figure out which is the lowest hose... maybe the one at the heat exchange?

SF Bay
1998 C36

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LCBrandt
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I haven't done this, but perhaps taking a hose off the water heater??? I also recall there may be a petcock on the engine block, portside. Maybe this will jog someone else's memory and we'll get an authoritative answer.

Larry Brandt
S/V High Flight #2109
Pacific Northwest, PDX-based
2002 C-36 mkII SR/FK M35B
 

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John Reimann
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There's no petcock I can see on the port side of the engine, but there is a plug that might be the drain. It's located just below what looks like it could be a freeze plug like what's in the engine of a car motor. I hope it isn't the drain plug because the head is somewhat stripped and where it's located I can't get a wrench on it. Maybe best bet would be the heater hose?

SF Bay
1998 C36

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LCBrandt
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I stand corrected. Not a petcock; a drain plug, as you say. Sorry.

Larry Brandt
S/V High Flight #2109
Pacific Northwest, PDX-based
2002 C-36 mkII SR/FK M35B
 

hilbre
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Joined: 7/19/08
Posts: 218

From your description, be careful as it might be the engine oil pressure sender you are describing.
If you do not want to disconnect at the water heater you can disconnect at the HE. Have a long tube ready to connect to the hose. It should reach back to beyond the galley so you can get a good gravity feed to a bucket. After refilling remember to Burp the engine.
John Meyer
Cruising Mexico currently in La Paz

John Meyer
Hilbre
C36 MKll, Hull 2135

Cabrillo Marina, San Pedro, CA

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John Reimann
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It was the drain plug for the coolant, and thanks for reminding me about burping the engine. I always find that a hassle as the engine is kind of heavy to lift up over my shoulder and pat, but I manage. Now to reinstall it.:rolleyes:

SF Bay
1998 C36

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