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Tractor Talk Discussion Forum

To bore or not to bore

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old fashioned f

04-18-2005 10:25:59




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Howdy all,

My JD R is soon to get a new set of piston rings on the main engine but I've heard at least one person say that simply putting in new rings can cause some problems with the old bore. Just wondering if that's correct? Also, if that is the case, should I get the block re-bored and have new sleeves put in (I say that since I've heard that most re-bore the R engines and put in larger pistons due to R sleeves and such not being available). Anyhow, would love to hear your thoughts before I tear into this thing. God bless.

--old fashioned farmer

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720Deere

04-19-2005 11:38:18




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 Re: To bore or not to bore in reply to old fashioned farmer, 04-18-2005 10:25:59  
Unless your bore is really bad, you shouldn't need to sleeve it. I have heard that you can bore those R's .375" over and put 730 pistons in them. I think you may need to change your injector tips to do it right, but it is quite an upgrade for the price.

If things aren't too bad, I would just cut the ridge, hone the cylinders and install new rings.



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old fashioned farmer

04-19-2005 10:52:11




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 Re: To bore or not to bore in reply to old fashioned farmer, 04-18-2005 10:25:59  
Howdy,

I appreciate all the replies. I really wasn't looking for procedure suggestions as I am familiar with the procedure for removing the pistons, etc. As far as the workload that the R gets, it is certainly not along the lines of a main use farm tractor. It is my primary work tractor but since I only do a share of the farming on the place (rest is leased to a neighbor) and the acreage is small according to today's standards, it really isn't on the scale of a full-time tractor. From what I'm reading here, I would say that just replacing the rings and doing a pretty good inspection on the rest is in order. Thanks again for the assistance. God bless.

--old fashioned farmer

p.s. You guys don't have remedy for fixing embarrasment do ya? Still feeling red-faced for not installing a new engine oil seal in a tractor I recently restored. That puddle under it really didn't add to the beauty of the tractor. :)

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Sloroll

04-19-2005 11:59:16




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 Re: To bore or not to bore in reply to old fashioned farmer, 04-19-2005 10:52:11  
Every puppy leaves a puddle.



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Pawel

04-18-2005 18:28:27




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 Re: To bore or not to bore in reply to old fashioned farmer, 04-18-2005 10:25:59  
Hi Old fashioned farmer,

I a work as a mechanic, and if you are going to use the tractor for real farm work I would fix up the bore. Also I would check the pistons for free play, rods, and depending on how the oil presure is you might want to check the main and rod bearings for wear. The reason for the main bearings is if you rebuild the top end it brings the engine"s power back up to original levels.

The bearings however are not new, though and now they have all of this extra wear and pressure put on them by the new top end overhaul, so they will fail sooner if you use it.

Sorry if this is unclear, my English is not perfect.

If you have any other questions please wrie back and I can see if I can help you.

God bless,

Pawel

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Sloroll

04-18-2005 12:10:13




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 Re: To bore or not to bore in reply to old fashioned farmer, 04-18-2005 10:25:59  
Well. I'm going to put my back against the wall here. I am sure you are very fond of your R. I would be if I had it. Are you going to work it like it worked 50 years ago or just every once in a while blow the cobs out of her? If you fire her up every once in awhile for nostagic reasons I would hone the cylinders grind the valves check the bearings and slap it back together. It will run great for what you need it for. "IF" you are going to use it as a primary tractor and your living depends on it. Go through it while it is down and do everything the expensive way, as your livelyhood depends on it. Most likely you are not working it hard nor will it ever be again, a whole lot more than a fun, useful diversion. IF it were mine I wouldn't bother with the bore. Bill

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DaveInMI

04-18-2005 14:17:32




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 Re: To bore or not to bore in reply to Sloroll, 04-18-2005 12:10:13  
Is reaming the ridge not recommended any more?



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Gerald J.

04-18-2005 20:41:18




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 Re: To bore or not to bore in reply to DaveInMI, 04-18-2005 14:17:32  
You nearly have to remove the ridge to remove the pistons out the top, else you will break pistons or rings or both trying to remove them from the cylinder. And the first stroke to the top, the new rings with sharp square corners will break on that ridge or break the top ring land of the piston.

Gerald J.



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Don L C

04-18-2005 20:00:32




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 Re: To bore or not to bore in reply to DaveInMI, 04-18-2005 14:17:32  
If you are just playing with it ,cut the ridge our hone the sleve until the shine is gone ....by moving the reamer up and down....this allows the new rings to cross over the cutting scratches to seet in..... Fit each ring...I hope you understand my gibber jabber,,,



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Sloroll

04-18-2005 14:58:49




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 Re: To bore or not to bore in reply to DaveInMI, 04-18-2005 14:17:32  
New gaskets are recommended too as is scraping the old ones off changing the oil, filters, draining the water etc. I didn't give a play by play, sorry. You are free to if you like Dave.



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RustyFarmall

04-18-2005 11:04:03




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 Re: To bore or not to bore in reply to old fashioned farmer, 04-18-2005 10:25:59  
Have you torn it down yet? If your R has been in continous use since it was new, I would bet that it has already been bored and sleeved.



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