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I'm very grateful to all of you for helping me. We were able to get the tractor running well today. Thank you for filling in the many gaps in my knowledge.

I'm very grateful to all of you for helping me. We were able to get the tractor running well today. Thank you for filling in the many gaps in my knowledge.

I'm very grateful to all of you for helping me. We were able to get the tractor running well today. Thank you for filling in the many gaps in my knowledge.

Thank you for the input. I'm on the fastenal website and have a question. Do I get a grade 8 bolt?

I am very grateful for all of you helping with my tractor. So many of you have been a tremendous blessing. I'm following up on all the advice / input and learning and growing in my mechanical skills. It has been like drinking out of a firehose but I am excited to learn so much. As a charity we...

Some bad news ! I got a new torque wrench that was defective resulting in the over tightening of this bolt that cracked the block. This is the end of the road for this machine. No more money can go into it. The bolt will hold the 94 pounds of torque required. See photo... Is there any hope?

I have a proper straight edge and have checked both block and head for flatness. There is nothing in the manual about replacing the bolts but I think that might be a good idea. I'm certainly missing something. I'm also going to check and make sure the bolts are not bottoming out.

A new head gasket leaked on my John Deere 750. Compression gases were coming into the cooling system after about 5 hours of use. I bought a new head gasket from the John Deere dealer. What is the advisability of using head gasket sealer before installing it? If so what product would you...

Thank you for the tip. I just ordered that kit.

I know this is an old post but I am having trouble with my jd750 head gasket. How was this resolved?

What is that kind of tester called?

In this torque sequence, the Auxiliary bolts are only torqued to 22 ft-lb. This seems like a very loose specification. I would think at least 40 ft-lb. These are the smaller bolt numbered 5,6 and 7. When I was removing the head they came off with extremely little effort. They were tightened...

Thank you for the input. I need to get longer straight edges too span the diagonal. What is that smallest feeler gauge that I need for this process?

Thank you for your input. There is no glaze on any of the sleeves. I'm grateful for that. Two sets of rings seem fine. The middle piston got messed up. I would like to test compression on all three cylinders before putting the oil pan back on. Please give me any other advice you think of. Is...

Thank you for the input. The head is at an excellent machine shop being checked for geometry and cracks. I am considering getting two of these straight edges in the link below as you suggest. I would like to check the block which is still in the tractor. The head is off at the shop. I...

Thank you

Injector Adapter for Compression Test on John Deere 750 Please does anyone know what size Injector Adapter I need for my John Deere 750 with a Yanmar 3T80UJ diesel engine? I was about to buy this kit but It looks like it will not fit. Is there a better kit that you would recommend...

Thanks, that looks great. Is it difficult to remove the cylinder sleeves?

Thank you !

I love your idea. Where would I find such a kit for a Yanmar 3T80UJ engine? I tried searching the Internet with no good results.

No, just oil. Also no oil in the antifreeze.

Yes, the odd part is a cap that goes over the valve spring. From what I can tell, the compression gasses were going into the coolant filling the cooling system with air. The overheating idiot light came on and I shut it off immediately. My guess is that the temp sensor was measuring air and...

I am so grateful for all of the help and input I have received in this place. THANK YOU ! This tractor is so useful in our garden ministry to the sick and the poor here in Nashville Tennessee, USA. There is a machine shop close by that can magnaflux, clean and flatten the head as needed for...

The middle cylinder of three is the worst. One of the rings will not spin. Cylinder 1 looks unaffected. I was advised to have the head checked for cracks and checked for flatness. The new head gasket is coming from the local Deere Dealer. Where should I purchase the new pistons? Please...

I had the head on my bench and this appeared. It may have come out of the head. I do not recognize it. Any ideas?

I got the head off. Here are the photos. Can anyone please give me any ideas?

Things progressed. Now I have bubbles coming into the cooling overflow reservoir and the motor will not start. Would the next step be to pull the head and check the head gasket?

Yes, it has a thermostat. I took it out when the behavior started and it was open. I am wondering if there was air in the radiator. I read about a condition called an "air lock." That post said to run the motor with the radiator cap off. I did that and saw lots of bubbles that gradually...

Greetings We are "I Was Hungry", a garden ministry serving the sick and the poor in Nashville TN, USA We use this tractor to till our garden plots but strange things are happening. When it is warming up antifreeze squirts out of the side of the overflow reservoir. This happened a while back...

Thank you Hoss710. We are having the crank turned. Thanks for the advice on Line boring the block. I just don't know if we can get a sleeve for the larger diameter needed for the front bearing. I have inquiries to that end.

On my John Deere 750 Tractor the oil pump housing broke and the engine failed. We currently have the engine apart and it is sitting at a machine shop. All four main bearings spun. The rod journals on the crankshaft look fine. The Rear bearing was the worst effected but we now have a good...

What advice do you have for choosing one of these two tractors I am considering buying? We have 16 acres and do a lot of mowing, box blading and tilling. We would also use it to assist in our sawmill and moving siltation from wet weather pond (dry in the summer but muddy). 1999 JOHN DEERE...

Is it advisable to machine the gears on this flywheel making them narrower? What I mean is to remove the material that is worn. Perhaps this will cause more problems? The other photo is of my starter gear. Should this be replaced or somehow reconditioned? What is common practice in these...

Thank you for that idea pmsmechanic. I like it. Do you have a photo of what that might look like? Or, do you have a link to the "T" fitting? Here is what is coming off of my JD750. It is just a small spin on filter.

I could use good instructions on how to install and test the Oil Pressure valve system. Never have I done that before but I think it is vital now.

Well Spotted ! Thank you ! Here it says what it does. https://www.hoyetractor.com/PROD/CH15497.htm

Please may I have the Torque specs for rebuilding a Yanmar 3t80-uj on a Deere 750 from 1982. We are rebuilding it.

Thank you pmsmechanic! I like that line of thinking... Do you know where the oil pressure relief valve is. I cannot find it here: https://partscatalog.deere.com/jdrc/sidebyside/equipment/78833/referrer/navigation/pgId/17468307

I would be very grateful for any insight into how to find out why my engine blew. When we went to rebuild the engine we noticed the oil pump had broken! Now we are faced with a major rebuild. We use this tractor for a food ministry to the poor and sick (cancer patients whos doctors have...