Pearson Yachts Forum

Pearson Boats - Common Systems => Engine and Drive Train => Topic started by: Bill1188 on May 02, 2016, 07:17:04 PM

Title: MD11c water leak.
Post by: Bill1188 on May 02, 2016, 07:17:04 PM

Anyone out there pull an MD 11c apart, or know of a knowledgable mechanic who works on them? On the intake/exhaust side of the engine, there is a tube that runs from bottom of block to head between the two cylinders. Mine is weeping water. Can't find a replacement, but could probably get one made. Anyone know how to get this out. Does one or both heads have to be removed to do this. Can't find any posts on this anywhere.

Title: Re: MD11c water leak.
Post by: Sanctuary on May 07, 2016, 06:57:39 PM

The water pipe is part of the exhaust manifold. 8 bolts, 2 gaskets.  You can have a machine shop cut a 3/8 NPT close nipple to press in as a replacement or tap the manifold for 3/8 NPT and use a pipe tee fitting and then use 5/8 heater hose or use 1/2" NPT and use 3/4" heater hose.

Al

Title: Re: MD11c water leak.
Post by: Sanctuary on May 07, 2016, 07:05:55 PM

Good picture here:

https://www.marinepartseurope.com/en/volvo-penta-explodedview-7742230-26-15106.aspx

Link from a post by Dolce Vita. Kudos

Title: Re: MD11c water leak.
Post by: Bill1188 on May 09, 2016, 11:35:07 AM

Part I am describing is number *.

Title: Re: MD11c water leak.
Post by: Bill1188 on May 09, 2016, 11:35:56 AM

Number 8.

Title: Re: MD11c water leak.
Post by: Sanctuary on May 10, 2016, 03:31:03 PM

Schematic you have is for an MD17C and is a different beast altogether.. #8 is a 17C oil dipstick tube

The intake side is on the STBD or Air filter side.  The exhaust side is on the PORT or outlet pipe/exhaust wet pipe. The only water stuff down low on the engine is on the exhaust side. There are 2 drains which may have been replaced ( I did with mine and use zincs) or maybe leaking. Otherwise the only water stuff is the hose and piping under the exhaust manifold.

  https://www.marinepartseurope.com/en/volvo-penta-explodedview-7742230-21-15101.aspx

 is the same part schematic for your 11C. There are 2 drains (#41 & #42) there that could be leaking. You can simply unscrew or drill them out and use 1/8" NPT brass pipe plugs.  Any way to get a picture of it? Ideally from 18" away and with a yellow pencil pointing to the offending part? If it's down below the elbow and petcock may be what you are looking at but it may look unlike the picture after 35+ years.

Hope this helps.

Al

Title: Re: MD11c water leak.
Post by: Bill1188 on May 12, 2016, 07:39:58 AM

When I am at the boat this weekend, I will take a photo of the offending part.