TX1300F engine questions

[dantnz]

Here's the page in question, if you can make sense of it.

 

[fxrs55]

I read that part when I did mine and though ok the head gasket
has sealant on it. I bought a new head gasket from the internet.
I found a web site selling the gasket for $59 us and I was just
learning about how parts here in the U.S. were in short supply
and expensive. The $59 head gasket was half of what others
were charging so I bought the cheaper one. When I got the gasket
in the mail I could see were someone traced the out line of the
coolant holes and then cut or punched them out. It did have fire rings
for the cylinder bores so I though thats how there come. Because the manual
says not to use sealant I did not. After several months of use the head gasket
started to weep coolant on the starter side of the engine and oil from
the exhaust side of the engine. I was very disappointed. I was not
going to buy that one again and try sealant. So I found a place in
Oregon USA that sold Mitsubishi parts and I bought a factory
head gasket and installed it. No more leaks. So it took me $199 us
plus shipping to do my head gasket. I should have bought the factory
one in the first place.

 

[fxrs55]

Oh make sure you get the head gasket for the
KE70 engine and now the KE75. The KE75 engine
has larger bores and the holes in the head gasket
are bigger also. I think that happened to another
member on this site Ilikeurtractor.

 

[fxrs55]

Oh, If you do the rings there were two
different types used. One had flat sides
and the other ones were shaped like
a key stone. It depends on the year of
manufacture.

 

[fxrs55]

Don't get me started. Another thing *&&&^*%#%^!#$!#
and also !!@#$^&%^*&*. Good luck.

 

[dantnz]

I haven't found any OEM head gaskets over here - so I'll be using sealant round the openings. There seem to be three types of those too!

Thanks for the tip on the piston rings, its just going to be luck on that front, I guess the old ones will be going back in if they turn out to be wrong.

Pistons and valves coming out tomorrow, so will be interesting to see how they look. I think the exhaust valves are 90% of my problem though.

 

[fxrs55]

Here are a few pictures of my head before repair.
I put the head on its side and poured kerosene
in the exhaust ports and the intake ports.
You can see in the pictures the exhaust valves
are leaking. Also these heads do not have steel
valve seats. The valves seat right into the
cast iron head. The cast iron is porous but as
the engine is run the soot from the exhaust fills
in the pores. Thats what I was told. After I lapped
all of the valves they sealed fine. I did buy new
valve springs because I though my old ones didn't
have enough seat pressure. The new ones were
much stronger.

 

[fxrs55]

Thanks for the advice - I've been using your rebuild thread as my main source of reference for some time now!

The pistons do move slightly in the bore, they seem to be sealing quite well. I'm really in two minds whether to take them out or not. Something that nags at me is that there was a lot of coking on the inside of the cylinder walls, it came off real easy, but I still find it strange that the rings wouldn't take this off. The more I think about it the more inclined I am to replace the rings just because I have the engine open and its done then, but it all takes time.

If there is coking on the sides of the cylinder walls that the rings
are not cleaning off, Maybe the rings are stuck in the grooves
on the pistons. This could be why rings are not keeping
the cylinder walls clean.

 

[dantnz]

Here are a few pictures of my head before repair.
I put the head on its side and poured kerosene
in the exhaust ports and the intake ports.
You can see in the pictures the exhaust valves
are leaking. Also these heads do not have steel
valve seats. The valves seat right into the
cast iron head. The cast iron is porous but as
the engine is run the soot from the exhaust fills
in the pores. Thats what I was told. After I lapped
all of the valves they sealed fine. I did buy new
valve springs because I though my old ones didn't
have enough seat pressure. The new ones were
much stronger.

Mine look exactly the same as that. Just lapped the exhaust seats and they are pretty good now. I'm glad you mentioned the lack of seat inserts, it took me a while to figure out while I was still seeing pits after lapping them! My springs feel good, will put the old ones back in for now.

 

[dantnz]

If there is coking on the sides of the cylinder walls that the rings
are not cleaning off, Maybe the rings are stuck in the grooves
on the pistons. This could be why rings are not keeping
the cylinder walls clean.

That could well be the case, either that or the rings are so worn they don't exert any pressure on the bore. Just off to the barn to drop the pistons out now, will take a little while as the loader really gets in the way of working comfortably underneath the sump.

Did you replace your conrod bearings?