franka02809
New member
- Joined
- Nov 28, 2025
- Messages
- 1
- Tractor
- TNV98 motor in a Takeuchi
Mechanically I am not very well versed. This is my first time opening a motor but I am interested and driven to learn about what I am seeing. The reason I started on this journey of removing the head is that I was getting compression out the radiator expansion tank. It would blow the coolant out the tank. I could see what looked like the combining of oil and coolant. I had a head gasket test tool but that thing would also bubble up and overflow almost immediately after starting. So the machine could be cold but it would still blow bubbles like crazy. In looking this up the general consensus was that it had to be a head or gasket issue. The pictures I am posting here are of the piston walls and the head before cleaning in more detail so I can get some help identifying what the problem was. In addition just before all of this the machine was running to hot. I ended up replacing the sensors inside the coolant housing attached to the head. Sorry I do not know the names of things just yet so I may make some mistakes here as I learn. It may be hard to detect what I see in this image that shows the head and one of the cylinders with visible damage to the head itself (missing metal)
View attachment new20251128_164412988_iOS.jpg
This is the inside of the cylinders and I can make out numbers etched in the top of each one so I think someone has already been inside here.
View attachment 20251128_170749405_iOS.jpg
View attachment 20251128_170755965_iOS.jpg
I am wondering if the cylinder walls seem normal to have a black ring at the top. I am wondering if the build up I see in the cylinders and pistons is normal for these. I am trying to make sure I identify the issue before I clean more and check the block is flat with a square. There is marks on the block I can see from what looks like someone trying to separate the head from the block with a screwdriver. Another thing I find odd is one of the push rods seems smaller than the others and does not have the same marking the others do (the yellow ring) Once removed it looks like its a bit rusty on the bottom like it may be from another motor. Its the one on the far right of this image View attachment 20251126_161040796_iOS.jpg
View attachment new20251128_164412988_iOS.jpg
This is the inside of the cylinders and I can make out numbers etched in the top of each one so I think someone has already been inside here.
View attachment 20251128_170749405_iOS.jpg
View attachment 20251128_170755965_iOS.jpg
I am wondering if the cylinder walls seem normal to have a black ring at the top. I am wondering if the build up I see in the cylinders and pistons is normal for these. I am trying to make sure I identify the issue before I clean more and check the block is flat with a square. There is marks on the block I can see from what looks like someone trying to separate the head from the block with a screwdriver. Another thing I find odd is one of the push rods seems smaller than the others and does not have the same marking the others do (the yellow ring) Once removed it looks like its a bit rusty on the bottom like it may be from another motor. Its the one on the far right of this image View attachment 20251126_161040796_iOS.jpg
