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Old 20-07-2013, 11:21   #31
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Re: I was bored so pulled the head on my yanmar

I know a guy who just happens to have a pop-off tester I can use. So will test injectors for sure.

Monday I'll finally have the engine out. Been removing "stuff" from the engine and figuring out how to get the v-drive off the prop shaft. Got to cut a wood floor support to get clearance to shift the v-drive forward off the prop shaft.

Luckily the floor is tabbed to hull, so the cross brace can come out while the engine is out. Then reinstall wood brace and install some fiberglass after engine is back in.

Going to use two block and tackles, one lifting and one for pulling. Got a few folks lined up to help too. So much fun. From a cost standpoint the blonde labor is free.

Of course doing it with a grumpy cat under foot, only makes it that much better.
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Old 20-07-2013, 11:29   #32
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Re: I was bored so pulled the head on my yanmar

Aww C'mon...

If you were REALLY bored you would have rebuilt the tranny and replaced all of the standing rigging too...
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Old 20-07-2013, 11:36   #33
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Re: I was bored so pulled the head on my yanmar

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Originally Posted by Cheechako View Post
Yanmar seems to have had a piston problem on that engine..what vintage is it? Could be the fact that mechanics were trained to tell customers to run them near max rpm 3600.... I used to run mine at 3200 sometimes... sounded like an airplane! ... and both engines failed prematurely. Of course it's really only about an 18 hp (?) engine rated much higher at much higher rpm!
Are these engines sleeved? cant remember... hope so... so it can be fixed.
Bummer......
It's a 1994 3gm30F. I pretty much ran it about 2200 rpm with 2500 rpm now and then when the winds were up. Its a bit too much engine for my dinky 25 foot water line. Yes it has sleeves, which I think, might be the cheapest option. But will find out next week, once the %$%^& thing is on deck.

My goal is to never have to do this again. It is SOOOOO much fun.
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Old 20-07-2013, 11:39   #34
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Re: I was bored so pulled the head on my yanmar

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Aww C'mon...

If you were REALLY bored you would have rebuilt the tranny and replaced all of the standing rigging too...
Well the tranny is coming out too. But luckily it works fine. The rigging has all staylock fittings so easy to do. I did change out the head stay years ago by myself. So its not that hard. Easier then pulling the $%^& engine.
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Old 20-07-2013, 11:51   #35
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Re: I was bored so pulled the head on my yanmar

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Originally Posted by sailorchic34 View Post
Well the tranny is coming out too. But luckily it works fine. The rigging has all staylock fittings so easy to do. I did change out the head stay years ago by myself. So its not that hard. Easier then pulling the $%^& engine.
Over the years I've pulled a diesel from boats twice. Once was $#!$#!@!!!!! The other was a center cockpit with the engine underneath.

The cockpit floors lift out, unbolted the motor mounts, exhaust, shaft flange, wiring harness and cables. Then lifted the whole thing straight up with a crane. Didn't have to pull manifolds, starters, even the alternator stayed on. One other thing I love about a center cockpit.
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Old 20-07-2013, 11:57   #36
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Re: I was bored so pulled the head on my yanmar

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Originally Posted by sailorchic34 View Post
Well the tranny is coming out too. But luckily it works fine. The rigging has all staylock fittings so easy to do. I did change out the head stay years ago by myself. So its not that hard. Easier then pulling the $%^& engine.
I'm proud of myself for not stooping to utilize all of the preceding innuendo material .... Wow.... This is a first...
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Old 20-07-2013, 12:35   #37
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Re: I was bored so pulled the head on my yanmar

Only 1100 hrs.

That does not speak well.
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Old 20-07-2013, 14:45   #38
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Re: I was bored so pulled the head on my yanmar

Hi Sailorchic34, you might try putting the head back on without the head gasket and firming a few head bolts then go around the head and see if you can get a thin feeler gauge into the gap between head and block. If any gaps are fairly minimal, say only a few thou difference they will probably pull down when you tighten the head down.

I had a 3GM30 and it was not sleeved.

If your motor is not sleeved and you are short of cash it would probably be worth attempting to salvage what you have before embarking on a new block.

You can buy cylinder bore hones for use with an electric drill. I would try to hone out the markings in the cylinder bores and try a new set of rings. Whilst an engine manufacturer or rebuild specialist would not recommend this sort of thing it is worth a try if economy is a priority.
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Old 20-07-2013, 20:42   #39
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Re: I was bored so pulled the head on my yanmar

Well read the service manual and gee it does not have sleeves. Got to get a bore gauge and measure #3 to see how bad it is. If its not too bad a 120 grit ball hone might cut enough out of it. Then finish with a 240 or 320 grit ball hone. But will not pull the pan and piston in #3 till monday afternoon and probably tuesday.

About have the engine ready to lift out. Got to cut the floor brace out tomorrow. Then make a wood cradle to support the engine.

I am so annoyed with yanmar. I did all the normal engine servicing like clockwork. #1 and #2 look really good and you can still see crosshatching in #2. #3 has vertical scuffing and mostly light grooves, except at 3 oclock where its got a nice bit of wear at the top of stroke. Not sure how much until I get the piston out and run the bore gauge in it.
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Old 20-07-2013, 21:00   #40
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Re: I was bored so pulled the head on my yanmar

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Originally Posted by sailorchic34 View Post
Well read the service manual and gee it does not have sleeves. Got to get a bore gauge and measure #3 to see how bad it is. If its not too bad a 120 grit ball hone might cut enough out of it. Then finish with a 240 or 320 grit ball hone. But will not pull the pan and piston in #3 till monday afternoon and probably tuesday.

About have the engine ready to lift out. Got to cut the floor brace out tomorrow. Then make a wood cradle to support the engine.

I am so annoyed with yanmar. I did all the normal engine servicing like clockwork. #1 and #2 look really good and you can still see crosshatching in #2. #3 has vertical scuffing and mostly light grooves, except at 3 oclock where its got a nice bit of wear at the top of stroke. Not sure how much until I get the piston out and run the bore gauge in it.
Ya I'd be annoyed too, you've got your hands full now. Imagine how nice it will be to have your engine working nicely again.

I'm getting an education here. Of all the tens of thousands of hours that have been put on all my tractors, combines, and boats, I have not had to deal with this yet. Overall, good maintenance seems to pay off. I forgot if you put all those hours on it or if a PO had their way with it?

Best of luck, and now to search about grit balls. Sounds like something at a southern Christmas party.....
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Old 20-07-2013, 21:20   #41
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Re: I was bored so pulled the head on my yanmar

I'd at least get hold of Yanmar and see if they will help you out a bit. A broken ring is something that could very well be installation error. Even if they only give you the parts, would be a savings. I don't know if I"d count on much though, the 3GM has been out of production for nearly a decade.

Bought a rebuilt engine for a Series Rover. Ran like a top for about 6 months then lost compression on one cylinder. Pulled the head and saw a groove worn in one cylinder. Pulled the piston and discovered broken ring that had to have been done on installation. Vendor at least gave me a sleeve and new set of rings to compensate for the rebuild error. Forgot to mention that it had taken me two years to get the truck back on the road begin to drive it.
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Old 20-07-2013, 21:31   #42
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Re: I was bored so pulled the head on my yanmar

I have a very heavy duty hone that is used with a slow speed 1/2" drill. My Dad gave it to me years ago. It is an Acme I think. I bored a number of engines over the years. I was looking on the web and found this piece. Would work if you are only removing 1 or 2 thou. Engine Rebuild 101 - Part 4 - Cylinder Honing - YouTube Check it out.
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Old 21-07-2013, 02:44   #43
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Re: I was bored so pulled the head on my yanmar

Since most boat engines sit at an angle and #3 is the rearmost cylinder it tends to be where water entering via the exhaust manifold enters. I would check whether the con rod might be bent using a steel rule and a vernier depth gauge as well.

My recollection of the 3GM30 is that there is a small breather hose from the tappet cover to the intake manifold down at the #3 cylinder end. This might somehow explain the oiliness in the #3 cylinder as well. If there is a score in the cylinder bore a broken ring appears more probable though. Check for oiliness in the intake manifold down that end if you have it off.
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Old 21-07-2013, 09:01   #44
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Re: I was bored so pulled the head on my yanmar

Best thread I've read in quite a while.

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Old 21-07-2013, 09:34   #45
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Re: I was bored so pulled the head on my yanmar

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i'm in awe of sailorchic
my boats are all outboards, and i'm not mechanicallly inclined....so I am still in awe.
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