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12-11-2013 05:50 PM
Re: Question on Volvo MD6A problems

Originally Posted by pkloop View Post

Tore engine down and got it unstuck..appears very good inside. No damage to cylinders or bottom half. Approx 500 bucks in gaskets/thermostat/impeller kit...checked all torques...cleaned and reassembled engine.

Fuel injector pump sent off to rebuild house..another 450 positive..injectors themselves clean
and in good shape. Pump itself has a stuck pressure regulator but other then that no major damage and assuming they can get parts should come back in good running order, cleaned up, ready to go.

Rebuild house has no idea how fuel would get in there..suggested PO maybe poured in cylinders? Injectors were loose when we pulled engine out.

Got a quote on a completely refurbished pump..3300..WTF? That's insane..speaking of insane every part on this engine costs an arm & a leg more then those for other makes. AND ARE EXTREMELY DIFFICULT TO FIND. This motor had better run for a long will also be the LAST Volvo I ever own..
I have the same problem in my MD6A Volvo, but mine is configured with a Saildrive.
We pulled the head, and have been oiling the cylinders (while still in the boat) and tapping on top of the pistons. No luck yet, but still trying.

How were you able to free up your engine?

Please help
11-12-2012 08:39 AM
Re: Question on Volvo MD6A problems

That is the Volvo MS2 transmission. The seal is easy to replace but you may find the surface that it runs on has some rust which is what damaged the seal in the first place.

Remove the screw at the center of the gear and then the gear simply slides off. It will turn a little when you back it off as the gears are helical cut. The gear used to be horrendously expensive about 15 years ago. We solved the problem by machining the gear down a few thou and then fitting a sleeve over the gear to provide a good surface for the seal to ride on. This is called a speedi-sleeve and you can read about it here
Speedi-Sleeve shaft repair kits

Good luck,
11-10-2012 04:57 PM
Re: Question on Volvo MD6A problems

IMG_20121110_164235_zpsbfc44d22.jpg picture by pkloop - Photobucket

IMG_20121110_164235_zpsbfc44d22.jpg picture by pkloop - Photobucket

IMG_20121110_164449_zps723f2621.jpg picture by pkloop - Photobucket

Here's more of the tranny..I don't know how to resize and put directly on here..sorry
Also various pictures of the teardown and such in the album on there

Video of engine running will be on there shortly too..
11-10-2012 04:35 PM
Re: Question on Volvo MD6A problems

Let me fix that for you...

There should be a nameplate on the tranny somewhere. It has probably been painted over. (It's unfortunate the engine was painted black...hard to spot leaks!) If you get a couple more shots of the entire tranny someone might be able to help identify by sight. Worst case scenario you can pull the seal out and get it matched at an engine shop. Some seals can be replaced with generic parts based on the inside and outside measurements.
11-10-2012 04:17 PM
Re: Question on Volvo MD6A problems

IMG_20121110_155234_zps82aede7b.jpg picture by pkloop - Photobucket

Sorry link should post now..
11-10-2012 04:16 PM
Re: Question on Volvo MD6A problems

I get 10 posts..
11-10-2012 04:15 PM
Re: Question on Volvo MD6A problems

11-10-2012 04:14 PM
Re: Question on Volvo MD6A problems

11-10-2012 04:13 PM
Re: Question on Volvo MD6A problems

Image to
11-10-2012 04:12 PM
Re: Question on Volvo MD6A problems

Image of tranny..finger is pointing at where I believe the seal is leaking. there a special tool to remove the end cap? It has a slot in it that looks like a flathead screw..only much larger.
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