G1000 FWA rebore/sleeve

PaulGrassick

New User
Some time ago I posted on this forum regarding a G1000 FWA Wheatland Diesel that I has rescued from a cattle station. Well I finally removed the heads from the motor, and the internals are not good. I now need to remove the front axle and sump and then the rod bearings so that I can pull the blocks and pistons off together, and then somehow push the pistons out of each block. It's pretty obvious that this motor is going to need a rebore and new pistons, rings etc. I think at least three of them are stuck - one in each block section. I am assuming at this point that the pistons are standard size and most unlikely to be usable again.
I discussed this with a local engineering shop, and they suggested that a rebore and sleeve may be a better option. So I thought I would put this out there and see what you guys think. I have not seen any discussions on sleeving these engines. The parts manuals all list pistons and rings at standard, +20, +40 and +60 sizes.
I have also noticed that the businesses selling aftermarket pistons only list pistons for gas/LPG engines.
So at this point I have two queries
(i) is it better to rebore and sleeve these engines, or rebore and use oversize pistons?
(ii) is it still possible to get pistons for these diesels?

No doubt I will have more queries on this rebuild, as my intention is get it back to a workable tractor in an ex-factory condition.
Thanks in advance
Paul
 
MM came out with a Big Power upgrade to 4 3/4 pistons. But that was 50 years ago. I have a set but hoping to find a project tractor.
 
A good shop can bore the blocks and install repair
sleeves. I have a MM that I had it done on. I had standard
pistons and they were good, just the bores were worn.
Was more economical for me to fix the blocks than buy
oversized pistons.



In your case, the deciding factor could be what size
oversize pistons you can get, and if the blocks will clean
up at that size.
 
I had to sleeve one of the bores on my Vista LP. I've never done a sleeve in a 4-5/8" bore diesel block but have talked to people who have done it successfully.


How hard is it to get M-M parts in the land down under?
 
(reply to post at 07:16:37 03/17/23)

Thanks J Wondergem. I won't be buying any parts until I know what I need. I think getting replacement pistons maybe the biggest problem so I just asked the question to get some thoughts on that issue. The pistons I get will determine whether I just have the blocks rebored or rebores and sleeved.
Paul
 
Thankyou all for your comments. Maybe a group response is more appropriate.

SWMolines - There are parts available here, but I think they are getting very hard to find. A few years ago the price of scrap
metal was so high that many tractor wreckers sent their slow moving scrap to China. I am sure there are parts out there. It's just a case of finding who has got them and whether they will sell them.
It's reassuring to know that sleeving the blocks of a 504 Moline diesel engine has been successfully done.

moresmoke - I agree with you. Getting a good set of pistons will determine whether I just rebore, or rebore and sleeve. Hopefully I can find a set and not have to pull a set out of one of the other Molines on the farm.

molinegb - Boring out a 4.625 block to 4.75 seems a lot. Even a +60 thou rebore is only 4.685. I'm sure it's OK if MM did it,
although it makes the block walls pretty thin and close to one of the head bolt holes.

Dieselbear - I am sure there are 504 blocks out there, but I may still need pistons to go with them.

Regards to y'all.

Paul
 

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