Perkins M20 - Head removed and this is what I found - Page 2 - SailNet Community
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post #11 of 29 Old 01-05-2016
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Re: Perkins M20 - Head removed and this is what I found

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Originally Posted by chowdan View Post
Wow that yanmar rebuild was impressive.

No clue if it was hydrolocked. Everyone I've contacted that owned the boat doesn't seem to know why happened. One bought it and 'it was like this' and another sold it and 'it was running perfectly'.

That said, could be hydrolocked, no clue wtf that sludge was though. I think it was salt, but am not 100% sure. To me, it felt more like puss...

On a flip note, I got 5 of the 6 valves moving free in the cylinder head. Final valve is still pretty stuck so its going to soak overnight. I might go get some ATF and acetone if its still stuck by tomorrow afternoon.
Was the Boat in the water during this time frame? and was the seacock open. It has been well lamented but even if used regularly and with the water valve left open, its important to close it when not used for extended periods. A very small leak around the water pump will do this damage in short order. Find the cause and fix it or it will happen again.
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post #12 of 29 Old 01-05-2016
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Re: Perkins M20 - Head removed and this is what I found

Does the P m-20 use these?



and a way to change them out.
http://gizmoplans.com/diesel-engine-...ylinder-puller

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post #13 of 29 Old 01-07-2016 Thread Starter
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Re: Perkins M20 - Head removed and this is what I found

That's interesting! I do not know if the m20 has sleeves. I believe it does not.

@albrazzi - I am not sure if the boat was in the water. One owner said it was running another said it wasn't. I do not know what happened to the engine or how it got seized. That white gunk I think could also be a fungus as it was 100% crystallized material
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post #14 of 29 Old 01-07-2016
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Re: Perkins M20 - Head removed and this is what I found

Sounds like your open and inspect will go deeper. Piston service anyway. I'm sure you will get lots of advice on next steps. Beta seems to be the recommendation for repowers, Yanmar too of course, but I like what I've read on Beta. If you choose that path of course.
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Re: Perkins M20 - Head removed and this is what I found

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Sounds like your open and inspect will go deeper. Piston service anyway. I'm sure you will get lots of advice on next steps. Beta seems to be the recommendation for repowers, Yanmar too of course, but I like what I've read on Beta. If you choose that path of course.
Unfortunately repowering is not an option. Cost of repowering is far beyond what i am willing to spend. If it comes to the point where this is not repairable, the engine is getting completely removed and we'll continue to putt putt around with the outboard that is present.

Not planning on keeping the boat with me for more than 5 years before I upgrade to something larger. Would much rather save the 8-12k and put it towards something that is a bit b igger and ready to go more offshore than this one
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post #16 of 29 Old 01-08-2016
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Re: Perkins M20 - Head removed and this is what I found

How about a little history.. did you buy this boat with the seized engine? Anyway.. seems you have the skills if you already have the beast apart. in for a penny....

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post #17 of 29 Old 01-08-2016 Thread Starter
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Re: Perkins M20 - Head removed and this is what I found

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How about a little history.. did you buy this boat with the seized engine? Anyway.. seems you have the skills if you already have the beast apart. in for a penny....
Boat was bought with the engine in this state. Its a Bristol 27, 1976. The previous own told us he has no clue what happened with the engine so he just stuck with using the outboard. He said he never liked inboard diesels due to the fact that "they always break and smell up the boat".

For the reason of the inboard not running, we agreed on the purchase price of $3k. It's outboard is fully functional, it had 2 sets of mains, 2 sets of jibs a brand new spinnaker and a storm jib in decent condition. The chainplates are being replaced, the standing rigging will be replaced in middle of summer or winter depending on finances.

As for the inboard, i called the owner(owner 2) who originally installed the engine. He installed it brand new back in 1993, sold the boat in 2003 for $13k. The engine ran perfect still when he sold it. The owner(owner 3) that bought it had called owner 2 and told him she was selling the boat because the engine had seized due to a loss of oil while being ran. She sold the boat for pennies on the dollar due to the engine problem. The guy who bought(owner 4) it from owner 3, apparently 'fixed' the seized engine as owner 2 saw in his port getting fuel in 2009. Owner 2 went to the boat and talked with owner 4, owner 4 said that he just had to add oil to the engine and replace the filters and it fired right up. There was no signs of oil leaks or any problems.
That was the last owner 2 had heard about the boat or saw it.

The owner that we bought it from(owner 5) said he has no clue what happened and never really cared due to the preferred use of the outboard.


All that said, atleast i have some background on the engine. Not enough to exactly know what happened to it. I've never see something like that inside the cylinder before. I do have a feeling that the engine was flooded via exhaust, however thats just a hunch, not anything else. The reason i have that feeling is due to the exhaust elbow is incredibly rusted, however its rusted on the outside. This could also be due to the fact that we intake seawater, and pump out through exhaust.

I have no experience with diesels, in fact this is the first engine that i've pulled the head from. If i appear to have the experience, then maybe thats a good thing, or could be bad. Its a learning process for me by all accounts. I'm a determined soul, not just to fix this engine, but to gain more knowledge. In the industry that I work in(software), learning is a constant process and is something i do on a daily basis. Being a self taught programmer, I do feel that being able to figure out and understand and fix this diesel engine is just something i am bound to do.
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post #18 of 29 Old 01-08-2016
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Re: Perkins M20 - Head removed and this is what I found

Sounds like you got a good idea of its history.

I inherited a lot from my boat too. It is a learning process. Like you, I knew what I was getting myself into.

Daniel
1981 Nor'sea 27,
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post #19 of 29 Old 01-08-2016
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Re: Perkins M20 - Head removed and this is what I found

That is some history Dan! thanks. Do it. you clearly have the skills and those you don't have can be obtained from here and diesel friendly machine shops.

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post #20 of 29 Old 01-12-2016 Thread Starter
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Re: Perkins M20 - Head removed and this is what I found

Thanks everyone! Definitely will be a slow process in restoring it due to funds, but over time we'll get this engine purring again!

I was at the boat over the weekend and it was still frozen. Added some ATF to all the cylinders. Hopefully that will soak in and I'll get some movement during the next weekend!
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