Cooling Issue

[Paul Campanis]

I got the head off. Here are the photos.

Can anyone please give me any ideas?

 

[Paul Campanis]

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?

 

[etpm]

You will need to replace the head gasket anyway but it looks to me, from the pictures, like a blown head gasket, especially the center cylinder. I dunno what the part is you are showing but it should be pretty easy to find out where it goes as there are probably two more of the same part. In any case the head needs to be checked for flatness. Might as well check the block too. This can be done by yourself with a good straightedge and feeler gages. But you need to be using a known good straightedge and know how to use feeler gages. Not rocket science by any means and anybody can do it you just need to learn how. I have good straight edges and can check them for straightness within .0001" in 3 feet, but I have a machine shop. You can take the head to any decent diesel shop and they too can check for flatness and if not flat enough they should be able to show you exactly where the head deviates from flatness and how much material needs to be removed if the head is too far out. There YouTube videos, I am sure, that show how to check flatness with a straightedge. In any case don't be tempted by a cheap Chinese straightedge. It may be good, it may not be. If you do go that route then buy two and check them against each other. I have done this for a friend. The straight edges bought for so cheap were not as straight as advertised. I fixed them as a favor.
Eric

 

[Paul Campanis]

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 tell me what I don't know.

Much appreciated.

 

[Paul Campanis]

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 about $150 with a one week turn around.

Please recommend a place to buy new pistons with rings. I do not want to install inferior quality pistons and rings.

 

[GMIslander]

Is there coolant in the base pan/oil?

 

[rScotty]

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 about $150 with a one week turn around.

Please recommend a place to buy new pistons with rings. I do not want to install inferior quality pistons and rings.

Did you ever identify that odd part? Are those slots in the photo a clue? I'm thinking it may have come from the head, not the block.

It is common to reuse the old pistons with new rings..., but those pistons show unusual wear. Usually pistons wear on the thrust faces, but those are worn on the faces that are 90 degrees out from thrust. My guess is that is one more piece of evidence of overheating. The gasket shows leakage between the cylinders too...so yet more evidence. Was it ever run without coolant? Or perhaps with the radiator screen completely blocked?
Another way to get overheating is if the side shrouds on the radiator do not fit tightly. Some coolants need to be diluted to remove heat efficiently

What I am saying is that the issue is probably overheating, and the reasons for that are so necessary and so simple that they need to be addressed before a new engine goes in.

Why not get the pistons from JD? If too expensive, ask at the diesel machine shop that does the head flattening. Or a marine diesel shop that services Yanmar diesels may be able to interchange them. Lots of that size in boats.

 

[Mike1955]

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 about $150 with a one week turn around.

Please recommend a place to buy new pistons with rings. I do not want to install inferior quality pistons and rings.

I suggest getting a recommend from the head shop. I wish I knew what to tell you. I’m not sure the piston is bad. And most time when the mechanics change pistons they also change sleeves. The the head shop should recommend. Although I think they are slow

 

[oldtimer 66]

Isn't this a Yanmar engine. You should be able to cross reference your engine model to a comparable Yanmar engine. From a quick look on line there seems to be plenty of Yanmar new parts available. A complete rebuild kit $469, sleeves, pistons, rings, bedarings, gaskets etc. Overhaul Rebuild Kit Fits for Yanmar Engine 3T80 3T80LE 3T80LE-HP 3T80

 

[Paul Campanis]

Did you ever identify that odd part? Are those slots in the photo a clue? I'm thinking it may have come from the head, not the block.

It is common to reuse the old pistons with new rings..., but those pistons show unusual wear. Usually pistons wear on the thrust faces, but those are worn on the faces that are 90 degrees out from thrust. My guess is that is one more piece of evidence of overheating. The gasket shows leakage between the cylinders too...so yet more evidence. Was it ever run without coolant? Or perhaps with the radiator screen completely blocked?
Another way to get overheating is if the side shrouds on the radiator do not fit tightly. Some coolants need to be diluted to remove heat efficiently

What I am saying is that the issue is probably overheating, and the reasons for that are so necessary and so simple that they need to be addressed before a new engine goes in.

Why not get the pistons from JD? If too expensive, ask at the diesel machine shop that does the head flattening. Or a marine diesel shop that services Yanmar diesels may be able to interchange them. Lots of that size in boats.

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 not water thus the engine got over boiling point.

One piston is barely marked, a second is badly marked so that one of the rings will not spin. The third has moderate signs of scraping but the rings all spin freely.

At this point I am thinking that I should maybe replace one piston and all the rings. The block cylinder sleeves look shiny and new.

My plan is to get rings and maybe piston (s) at the Deere dealer.

Yes, those yanmar engines are used in sail boats !

Much appreciated.

Please let me know any other thoughts or ideas.