So a while back I posted my jd 4300 had exhaust coming out the valve cover breathertube. Well I took it to the dealer and they tell me the cylinder walls have scoring on them. They gave me a price to fix it of 16000 , that is correct not a typo. When I get it back I will with help properly rebuild it or buy a new engine. Does anyone know who sells yanmar engines.
4300 engine rebuild
- Thread starter steviep
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rekees4300
Elite Member
For $16,000 just buy another 4300 or use as down payment for newer JD model! Good luck with the rebuild.
Dealer Locator｜YANMAR
http://www.tractorbynet.com/forums/parts-repairs/146974-john-deere-4300-complete-rebuild.html
Dealer Locator｜YANMAR
http://www.tractorbynet.com/forums/parts-repairs/146974-john-deere-4300-complete-rebuild.html
Adiredneck
Gold Member
How many hours are on it?
Shaneard
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$16K? WOW! I wouldn't set foot in that dealers door again. Look on tractorhouse.com you can find complete 4300 tractors with loaders on them way cheaper than that!
It has around 1050 hrs on it. I decided not to have the dealer rebuild it . A good friend of mine is going to help me rebuild it. The dealer says the cylinder has scoring on the walls.The hard part from what I can see is the tear down I believe the engine has to be removed to pull the motor.
super55
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Wow.
I'm guessing they just didn't want the work because a rebuild kit for that motor is only about 600 bucks on eBay.
Out of curiosity how did they come up with it being a scored cylinder wall? I would have thought smoke coming out of the valve cover breather would have been more along the valves in the head not seating causing blow-by. Smoke coming out of the oil fill cap was what I thought was the culprit for scored cylinder walls or rings.
Are you noticing a significant loss of power with the engine or is this something that you just happened to notice one day while you had the hood open on the tractor?
I would hate to see you do a complete teardown/rebuild if it isn't even necessary. Yanmar builds pretty good engines, a thousand hours shouldn't be anything for the engine.
I'm guessing they just didn't want the work because a rebuild kit for that motor is only about 600 bucks on eBay.
Out of curiosity how did they come up with it being a scored cylinder wall? I would have thought smoke coming out of the valve cover breather would have been more along the valves in the head not seating causing blow-by. Smoke coming out of the oil fill cap was what I thought was the culprit for scored cylinder walls or rings.
Are you noticing a significant loss of power with the engine or is this something that you just happened to notice one day while you had the hood open on the tractor?
I would hate to see you do a complete teardown/rebuild if it isn't even necessary. Yanmar builds pretty good engines, a thousand hours shouldn't be anything for the engine.
Citydude
Elite Member
The diagnoses and quote to repair is highly suspect. Good call on not going with the dealer.
Stimw
Elite Member
Before tearing it down you need to investigate the problem.
It could even be a head gasket blown into an area putting exhaust into the crankcase.
Or a cracked head doing the same thing.
It could even be a head gasket blown into an area putting exhaust into the crankcase.
Or a cracked head doing the same thing.
BrokeFarmerJohn
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What would cause scoring on the cylinder walls?
