Please Help, I need your opinion!!!!!

[amitysanimal]

I have a 1977 Kubota B7100 that has 7549 hours registered on the meter and the meter doesn't work anymore, so hard to say how many hours are actually on this engine. My engine has a bad wrist pin, and I don't know how the bearings, rods, pistons, rings look yet. I took the head off and found the slop in the front piston, but not sure if it ruined the piston, rod or what.

This will be used on my own property, mostly for the FEL. It also has a BH on it but probably won't get used much.

My question is should I try and rebuild it or buy a used engine I found nearby with 2730 hours on it. The engine is out of a 1981 and will have a satisfaction guarantee for 90 days. He is asking $800.00 but can probably get it for less. Just seems like this would be a lot less hassle and probably cheaper way to go. We are also in the middle of selling our house and have to be out by March 30th, possibly sooner. We haven't got the closing date yet.

Any ideas, suggestions will be greatly appreciated.

Cleve

 

[Gamemaster]

7549hrs vs. 2730hrs and $800.oo or less. I'd swap it and you have spare engine for parts.

 

[EddieWalker]

I don't see how you can rebuild it for less that $800, or even come close. If the engine looks to be in good condition, I'd swap it for the newer one.

Good luck,
Eddie

 

[RobJ]

$800 ain't to bad for a replacememt. Since you have the head off I'd spend another 15 minutes and pull the piston. Just have to pull the pan, easy on a tractor, then 2 rod bolts and pop it up and out. Not to much to lose to go a little deaper.

In my days of rebuilding I have neer seen a wrist pin fail, usually something else will go first. I have seen them fail because of human error, someone forgot the snap ring or didn't seat it properly. In that case the pin will usually rub on the cylinder wall, scoring it until the rings fail or something else. there is usually not enough room (I've never seen any), that the pin can slide sideways and come out. And in general the pin is never exposed at the bottom of the cylinder.

Got any pics?

 

[amitysanimal]

I'll have to look and see if the oil pan will come off without pulling the engine. Not sure if there will be room to get the pan off because of the front axle.

I am quite sure the wrist pin is bad because when I turn the motor over and bring the front piston to TDC, then turn the engine over some more, you can feel the slop in the piston. Maybe it is in the rod bearing, but that would be even worse.

Looks like the way to go is with that used engine. I'll slap mine back together for now so I can at least start it to load on the trailer for when we move. Gotta convince the wife I need to buy that engine.

I called the guy with the engine and it is still inside a garage mounted in the tractor so I can go hear it run, so thats good. It is about an hour drive from home too. He said he would give a 60 day satisfaction guarantee on it.

I tried to see what he would offer me for my B629 backhoe, he offered me $400.00 for it. I thought that was a joke, shouldn't a backhoe be worth a bit more than that? One on Ebay just went for $1725.00 about a month ago.

Thanks for the replies,
Cleve

 

[teach]

Cleve,
"It also has a BH on it but probably won't get used much."
Is the backhoe frame mount or 3 pt? Any interest in selling it? Might help recoup the cost of the new engine!
Teach

 

[amitysanimal]

I guess it would be the 3 point hitch mount. It mounts on the rod where the 3 point hitch arms mount, then it has brackets that run up front and connects somewhere. I never really looked it over too much really, only had it a month or so. I would sell the bh if the price is right. He offered me $450.00 and there is no way I'd sell it for that.

eBay: Kubota backhoe (item 160066890075 end time Dec-30-06 15:33:12 PST)

Mine is a little different than this, mine has 4 levers instead of 2 and it doesn't have that roll bar looking piece on it.

If you are really interested I can send you some pics of it.

PM me and offer and I'll surely consider it.
Cleve

 

[amitysanimal]

Here is a link to the manual of the one I have, hope it works.

MediaMax, powered by Streamload - Free Online Storage - Share Videos and Photos - Online MP3 Access

Click on B series

Then scroll down a bit and click on 629 backhoe.....

 

[amitysanimal]

I found another engine with around 700 hours on it but it came off a rice harvester and has the pulley mounted on the back. Can I mount my flywheel on this engine if I take off the pulley?

This engine is $699.00 plus shipping from Washington state to Maine.

 

[teach]

Cleve,
Could you post those pictures or send them to me? I'm not sure it would fit my newer B7100, since the frame on the newer tractor (1990, HST) is slightly longer than on the the older B7100's. I know the loader from for a newer B7100 will not fit the oder B7100's. I also have a 1983 B7100, but I don't have a loader on it, so the backhoe is not an option for it. Also, what is "the right price" or least what is the ballpark? Finally, I am VERY impressed with the number of hours on your current engine, you must really take care of that little machine!
Teach

 

[amitysanimal]

I'll try and get some pics for you tomorrow. I don't know if it will fit or not either, all I know is that the tractor is a 1977 with a B219 FEL and the backhoe is a B629.

I just bought this tractor used about a month and a half ago, so I am not responcible for the maintenance of it. Actually, if you ever saw the poor little thing, you wouldn't think it ever even had any maintenance done to it. It is pretty sad looking. I'll PM you about the price.

 

[teach]

Cleve,
Here are the pictures of my older B7100 that is for sale.
Teach

 

[Kubotasrking]

I have a 1977 Kubota B7100 that has 7549 hours registered on the meter and the meter doesn't work anymore, so hard to say how many hours are actually on this engine. My engine has a bad wrist pin, and I don't know how the bearings, rods, pistons, rings look yet. I took the head off and found the slop in the front piston, but not sure if it ruined the piston, rod or what.

This will be used on my own property, mostly for the FEL. It also has a BH on it but probably won't get used much.

My question is should I try and rebuild it or buy a used engine I found nearby with 2730 hours on it. The engine is out of a 1981 and will have a satisfaction guarantee for 90 days. He is asking $800.00 but can probably get it for less. Just seems like this would be a lot less hassle and probably cheaper way to go. We are also in the middle of selling our house and have to be out by March 30th, possibly sooner. We haven't got the closing date yet.

Any ideas, suggestions will be greatly appreciated.

Cleve

Swap.

 

[amitysanimal]

teach......your tractor looks a LOT nicer than mine. I got some pics taken today of mine and the loader, I'll try to get them onto this computer tomorrow.

 

[BTDT]

I'm still not sure of your diagnosis about the wrist pin being bad. Are you saying you can get piston to top of cylinder by turning crank, and then reversing direction of crank and there is hesitation before piston moves? May have a rod cap coming off. I'd pull pan and have a look. Still would be nice to get the other engine and have this one for parts if needed.

 

[amitysanimal]

Thats what I did, it may be a loose rod cap, hope not cause that wouldn't be good on the crank. In order to pull the pan I have to take the engine out. I am in the process of selling this house so I can't really tear it all apart right now.

 

[amitysanimal]

I found this engine for $699.00 with $249.00 shipping. It only has 400 hours on it. I I remove the pully from the flywheel, will this fit in my B7100?

 

[Dusty]

Do you really think that someone would break up a tractor and sell the engine if it only has 400 hours on it? I don't think so, but I believe that the seller is telling you what they think that you want to hear. Go for the $800 engine that is local. If it doesn't look good when you get there, all you have wasted is an hours trip and some fuel. If you buy an engine from the other side of the country, and after it arrives, you find out that it is NG, then what do you do???? Ship it back?? You pay to get it here, and you will pay to send it back. Then you have to worry about getting your money back for the engine itself.

 

[amitysanimal]

I checked again and the engine has around 700 hours on it, not 400, my mistake. The engine didn't come out of a tractor, it came out of a rice harvester. Thats why I wanted to know if it will fit in my tractor if I put my flywheel on it. This is being sold by a business, not an individual.

 

[Dusty]

There are a lot of variations on engine blocks that make it hard to tell. Have them give you all the casting numbers on the engine block and match them with your engine. Also, does the replacement engine come with a bell housing? Look for numbers on the bell housing also. You might have to switch your bell housing to the new engine. If the crankshaft is the same as the crankshaft on your engine, there should be no problem putting a clutch assembly on the engine. I have learned that not all things that look alike are alike, and that is one more reason to go with the one that you can physically look at and compare with what you have. You need to get a parts breakdown for the replacement engine and one for your tractor engine and start to compare part numbers to know for certain. If any number is different, then that part is different. Sometimes, it won't matter, since you can take the part from your original engine, but not always. Sometimes the differences are very subtle, but make a major difference. I have seen automobile engines from the same year, make, and model that had variations, that were enough that they couldn't be interchanged, even though all outward appearances that they were the same. If the instance that comes to mind, the difference was that one engine was drilled differently for the generator mountings, and was not compatible.