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Old 24-07-2013, 13:01   #106
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Re: I was Bored so Pulled the Head on my Yanmar

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Water enters the combustion chamber through an open valve. Doesn't matter what the height of the cylinder in relation to others. It'w where in the rotation cycle that the engine stopped if and when water floods in through the exhaust. Still no reason to assume that the problem was caused by water ingress without evidence. It's nearly impossible to get an engine started with enough water in a cylinder to cause hydraulic lock. I did it on my old Volvo by activating the compression releases and getting the engine started on one cylinder before dropping the compression release on the offending cylinder. Yes, it was a very stupid thing to do.

The Yanmar mounts on my engine were very rusty after 10 years in the boat. No direct contact with salt water, just atmosphere in a boat.

Is there a Yanmar dealer in your area or one that is following this thread who might rent you the tool that you need to get the flywheel nut off??
Yeah, but as soon as the engine is cranked even a touch it enters the nearest cylinder anyway..
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Old 24-07-2013, 13:20   #107
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Re: I was bored so pulled the head on my yanmar

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I was thinking she was saying .1 inches! and common reboring would be in the .030-.060 inches if I remember right... (1-1.5mm)
oh blonde happens. I meant 10 over, not .10 over. 10 over is engine rebuilder speak for 10 thousands over or .01" or .25 mm which is generally the first size up. 20 thousands or .50 mm being the second common size up for the rebuilder.
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Old 24-07-2013, 13:28   #108
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Re: I was bored so pulled the head on my yanmar

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Now, to the money. You have some 3000 readers of this thread, nearly 100 commenters. I know you cannot solicit money on this forum, but what if someone else did? What If I stated that I never met you, don't know you, and probably never would. Then, if I went on to say "Why don't you open a Paypal account?" Then, you can tell me, here, what that account number was, and maybe, just maybe some forum users could kick a few $$ your way. 5 here, 10 there, it all helps.

Then of course you could send photos of the job in progress, with you in a bikini, playing with your pistons to the contributors as thank you emails.

Would that work for you?
For someone like Sailorchic34 who makes many valuable contributions to the forum I think a little cruiser to cruiser help would be a great idea.
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Old 24-07-2013, 13:50   #109
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Re: I was Bored so Pulled the Head on my Yanmar

Can you show a pic of what nut you need to remove?
I have some big sockets, just bought a 2-1/4 for my rotary engine.
A pipe wrench is also useful in many cases.
Cut the socket so it fits over and use a pipe wrench on the socket.
Welding to hardened steel tools usually doesn't work well.
Autozone can loan some specialty tools, it looks like 36mm is the size for axle nuts and there are sockets for them, might have a set of those.
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Old 24-07-2013, 14:03   #110
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Re: I was Bored so Pulled the Head on my Yanmar

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Can you show a pic of what nut you need to remove?
I have some big sockets, just bought a 2-1/4 for my rotary engine.
A pipe wrench is also useful in many cases.
Cut the socket so it fits over and use a pipe wrench on the socket.
Welding to hardened steel tools usually doesn't work well.
Autozone can loan some specialty tools, it looks like 36mm is the size for axle nuts and there are sockets for them, might have a set of those.
It has to have a 5" inside clear opening to clear the end of the drive shaft. Compounding it is the weights for the governor weights adjacent to the nut.
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Old 24-07-2013, 14:25   #111
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SC, haven't read the thread but if I can lend a wrench to the cause send me a PM. I'm not too terribly far from you and have a collection 3/4" drive sockets and oversize wrenches. Primarily SAE size but a few metric too.
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Old 24-07-2013, 14:47   #112
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Re: I was Bored so Pulled the Head on my Yanmar

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It has to have a 5" inside clear opening to clear the end of the drive shaft. Compounding it is the weights for the governor weights adjacent to the nut.
was afraid of that... it has to be a socket, and any normal socket is not going to fit over the shaft. So I think you will need get an axle nut socket which is deep and cut the drive side off so it fits, and then with the part sticking out put a pipe wrench on it to turn it. I checked and don't have a 36mm or 1-7/16 axle socket.

I'd be happy to buy one and cut off the end for you and send it to you from sac, i assume you can get a big pipe wrench locally. just let me know, can pick one up today.
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Old 24-07-2013, 16:17   #113
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I checked and don't have a 36mm or 1-7/16 axle socket.
I just checked and neither do I. Sorry.
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Old 24-07-2013, 16:28   #114
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Re: I was Bored so Pulled the Head on my Yanmar

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So I think you will need get an axle nut socket which is deep and cut the drive side off so it fits, and then with the part sticking out put a pipe wrench on it to turn it.
Would it be easier to drill the socket than to cut the drive end off?
Drilling the socket to allow the drive shaft to pass through would provide additional stability during use with the pipe wrench.

Chuck
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Old 24-07-2013, 16:30   #115
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Re: I was Bored so Pulled the Head on my Yanmar

The darn nut is torqued to 72 foot pounds so most likely need 90-100 foot pounds to break it. I found a light weight plumbing shower valve socket that will fit, but the big pipe wrench with a 30 inch cheater on the end is just flexing the light walled socket. Lord knows yanmar could not have made that easier.
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Old 24-07-2013, 16:32   #116
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Re: I was Bored so Pulled the Head on my Yanmar

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Would it be easier to drill the socket than to cut the drive end off?
Drilling the socket to allow the drive shaft to pass through would provide additional stability during use with the pipe wrench.

Chuck
That will be the next option, I'm thinking.
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Old 24-07-2013, 17:19   #117
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Re: I was bored so pulled the head on my yanmar

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The thinking being, it's cheaper to sleeve the one cyl. with 1 new std.piston and just new rings on the others rather than rebore all of them to oversize with all new pistons. Maybe buying all new pistons would be worth it even though you would be just getting a hone job on the other cylinders. Nothing like new pistons and a valve job. You are doing the rod bearings too?
I don't know squat but putting two old pistons back in when one of the old ones already fell apart is like......ummm...........no. IMO.

I know there is a budget though.
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Old 24-07-2013, 17:36   #118
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Re: I was Bored so Pulled the Head on my Yanmar

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Old 24-07-2013, 17:41   #119
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Re: I was Bored so Pulled the Head on my Yanmar

If you just replace one piston, it would probably pay to compare its weight to the others.

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Old 24-07-2013, 18:00   #120
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Re: I was Bored so Pulled the Head on my Yanmar

Drilling a 1.25inch hole into hardened steel socket is not so simple.
Using a cutoff wheel will get it done, still time consuming.
Then put something around the shaft to support the open end.
leather, wood, plastic, the socket itself can gouge the shaft.
I would make a collar from HDPE.
Just made some HDPE 'bearings' in my lathe for my jet nozzle.

The engine is not worn, it just had a failure, so just fixing the failure is fine.
One oversize piston is OK, there is not a balance issue, replacement should weigh the same ( can always check and adjust if needed ).

Sometimes they have reverse threads, I know my midget axle does on one side, and boy that one will get you! Nothing will get it off when you are tightening it until it breaks off. And using a chisel to remove these big nuts can work, a risky method though.
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