- Thread starter dactura
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TheOldHokie
Well-known Member
- Location
- Myersville, MD
A well known Japanese manufacturer that's been around for quite some time.
[u:0a587b2065]Yanmar Website[/u:0a587b2065]
TOH
b:934869456a][i:934869456a]
Had this one for 13 1/2 yrs. Loads of work in the fencing & landscape buis.
90's 871 JD, with Yanmar 28 horse engine. 12 forward gearing (three range diffy) and four wheel drive!!.
Only problem was once, with the duel clutching......prob, due to riding the clutch.
Dang good tractor!!!!
Gary[/i:934869456a][/b:934869456a]
I had a three cylinder Yanmar engine. Had to put pistons and rings in it. Discovered that the engine has no main bearing caps. The mains are just big
rings in the block and the whole crankshaft must pass through these big openings like a cam shaft with bushings. With that much bearing surface I bet
they never have main bearing failure????
Zane
rings in the block and the whole crankshaft must pass through these big openings like a cam shaft with bushings. With that much bearing surface I bet
they never have main bearing failure????
Zane
TheOldHokie
Well-known Member
- Location
- Myersville, MD
Probably something similar to what Kubota (and probably others) do. The main bearings are conventional inserts which are contained in a two piece housing called a main bearing case which in turn is bolted around the main journals of the crankshaft. On my Kubby there are three mains/cases and the crankshaft and main bearing cases are removed from the crankcase as a unit. The main bearing cases are then removed from the crankshaft journals for insert bearing replacement. Why you ask. Well for one all of the normal crankcase damage/wear surfaces are part of the main bearing case which allows for easy renewal with no need for machine work. And in case you are wondering just how expensive that idea is a new OEM bearing case for my D950 engine is $80. The equivalent of a main tunnel line bore and hone (three new cases) is $250 and can be done in your basement with ordinary hand tools. And in the case of a single point failure (e.g. one spun main bearing) you can get by with just one ;-)
TOH
(quoted from post at 16:05:12 01/28/16)
Probably something similar to what Kubota (and probably others) do. The main bearings are conventional inserts which are contained in a two piece housing called a main bearing case which in turn is bolted around the main journals of the crankshaft. On my Kubby there are three mains/cases and the crankshaft and main bearing cases are removed from the crankcase as a unit. The main bearing cases are then removed from the crankshaft journals for insert bearing replacement. Why you ask. Well for one all of the normal crankcase damage/wear surfaces are part of the main bearing case which allows for easy renewal with no need for machine work. And in case you are wondering just how expensive that idea is a new OEM bearing case for my D950 engine is $80. The equivalent of a main tunnel line bore and hone (three new cases) is $250 and can be done in your basement with ordinary hand tools. And in the case of a single point failure (e.g. one spun main bearing) you can get by with just one ;-)
TOH
Interesting, TOH. Thanks for sharing this. I don't understand all that much lol but I think I gather that if I need to repair that part of my Kubota it should be easier and cheaper. Not sure if they did it back in the late 70's or not but that's when my tractor was manufactured.
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