Blow by 45 hp 3 cyclender tractor?

Question

I have a 87 tractor that sokes very little though the exsost.
while going down hill no load you get gray smoke if pulling a large load up hill you get a little black smoke but not much eather way as for as the blow by it is extreme all the time it the tractor is running its got blow by bad. Valves? Rings? all the above. a jug kit runs 190 $ for each cyclender so just trying to find out be fore i sink a lot of money in to it.Thanks.Ben

Answer 1

Blow by is a result of compression escaping into the crankcase. Probably rings and liners but before spending $190 plus gaskets, do a compression check. If you do tear it down it would make sense to do a valve job and replace the bearing inserts.

Answer 2

If it is a small amount of smoke under a heavy load I would lean toward valve seals , does it have a lot of hours on it ?. If you are going to do anything in the lower half ( rings and main , connecting rod bearings ) then I would suggest you do it all as once you change the rings you will increase the compression and put more strain of the valve train...