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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar 2GM20F
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Thread: Yanmar 2GM20F Reply to Thread
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Topic Review (Newest First)
12-31-2012 07:57 PM
smurphny
Re: Yanmar 2GM20F

The rebuild parts are not too expensive. If, as Minnewaska has said, you get bearings fitted and valves redone in a shop, you should be able to save some bucks. I would remove the head first and check for how much wear is on the cylinder walls. Then plastigauge a couple of journals. Get an idea of general wear. If you see a big ridge or heavy scoring, it may be better to just order a brand new short block and reuse everything else.
12-29-2012 08:18 PM
Minnewaska
Re: Yanmar 2GM20F

Quote:
Originally Posted by 73Morgan View Post
..........I am leaning towards full rebuild by a erengine rebuilder machine shop.
Be sure you know what they are going to do. A cheap rebuild is a waste of every dollar. The paradox with a rebuild is that you really want to get everything back to near new, while you have it out. You wouldn't want to pull it again, would you? However, a good rebuild can cost well more than half the value of the motor.

One way to save some money is to do the disassembly and reassembly yourself, if you have the skill and manuals. Outsource the machinist stuff that requires special tooling.

Another strategy is to go find your exact motor in excellent used condition, which would be much less expensive than a rebuild.

If you want to be decadent, consider buying a new one and seeing if they will take your core on trade. Puts you back together, worry free.
12-29-2012 07:31 PM
boz86
Re: Yanmar 2GM20F

Quote:
Originally Posted by 73Morgan View Post
I promised my wife that I would renovate the bathroom this winter.
I've got one bathroom done already (just barely in time for the in-law visit at Christmas). Got another bathroom to go this winter and then it's on to the boat.

OTOH, I'm turning the hot tub over to the service store. I'm out of time to do everything, and work a full time job, so I feel your pain.
12-29-2012 06:25 PM
73Morgan
Re: Yanmar 2GM20F

Quote:
Originally Posted by Gary M View Post
When I removed my Yanmar 2GM, I built a 2x4 frame that just matched up with the motor base. Then I just had to slide the motor forward onto the frame. You may or may not have access to make this work but it was quite a simple operation.

Have fun
Yep, that's what I did, and added a cross member to sit on so I could raise the engine off the engine mounting bolts while I was hoisting it up from the boom. Made friends with the rigger at the yard. While I was lowering the engine into my pickup, he came buy and said "You are doing that by yourself, I see that the Fearless name on the boat is quite appropriate." I told him "The boat is Fearless, I am quite nervous. The boat will let the owner do any doom thing he wants." 1 hour later we were still exchanging adventure stories.
12-29-2012 06:02 PM
73Morgan
Re: Yanmar 2GM20F

Quote:
Originally Posted by Minnewaska View Post
So what turned out to be the master plan? Fully rebuild? Doing it yourself?
Jut pulled the engine out myself yesterday. It's in the back of my pickup now. I am not sure it's worth it for me to take on the rebuild. I promised my wife that I would renovate the bathroom this winter. Even though I rebuilt a 4cylinder gas engine in my teens I consider myself a novice at that. Given a choice I would probably rather work on the engine if I had all the fancy measuring tools. So, I am leaning towards full rebuild by a erengine rebuilder machine shop.
12-29-2012 05:34 PM
Gary M
Re: Yanmar 2GM20F

When I removed my Yanmar 2GM, I built a 2x4 frame that just matched up with the motor base. Then I just had to slide the motor forward onto the frame. You may or may not have access to make this work but it was quite a simple operation.

Have fun
12-29-2012 04:45 PM
Minnewaska
Re: Yanmar 2GM20F

So what turned out to be the master plan? Fully rebuild? Doing it yourself?
12-29-2012 02:43 PM
73Morgan
Re: Yanmar 2GM20F

Quote:
Originally Posted by Minnewaska View Post
I would be more worried about disturbing the pan gasket than the pan breaking. Not terribly worried about either. After the rebuild, I wouldn't place it down on the pan. On the way out, I would not be worried.
Good point about the gasket, I wasn't even thinking about that. Might as well build a stand now. Thanks
12-29-2012 08:49 AM
Minnewaska
Re: Yanmar 2GM20F

I would be more worried about disturbing the pan gasket than the pan breaking. Not terribly worried about either. After the rebuild, I wouldn't place it down on the pan. On the way out, I would not be worried.
12-29-2012 08:32 AM
Rockter
Re: Yanmar 2GM20F

I would be very surprised indeed if it was a problem.
It would be a monumental design failing if it were.
Lay some wood down first, anyway.
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