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H engine rebuild

P

PaulGinMn

Member
Im restoreing a 1939 H that wont get used much other then a few parades and maybe a plow day or two. The engine was froze when I bought it so I am going to put new sleeves and pistons in and have the head check and touched up if needed. The crank looks good and the oil was clean do you think I could get by with just putting in new rod bearings and put it back togather or do I need to look farther? I do not know any history on it buy found a broken hanger for the throw out bearing that I believe is way it was parked. Thanks Paul
 
Have you already disassembled the engine?

Just because it's seized doesn't automatically mean you need new pistons/sleeves.

If you can free it up, and it runs, it should be fine, especially for light use.
 
2 of the pistons were stuck and I broke a sleeve getting the piston out. The rings are stuck in the pistons pretty good so thought I would just put in the new sleeves and pistons. The sleeves didnt show much wear and the rod bearings are .002
 
If you have the engine torn down, take the crank to a machinest and see if it needs grinding and the proper size bearings, it doesn't cost that much more.
 
I took and meassured the rod jornals and they are well within spec so wasnt going to pull the crank i didnt think. I was thinking of leaveing the main and putting in new rod bearings since they were apart.
 
0.002 were put in during a previous overhaul without doing anything to the crank. I found the same situation on my C. The machinest said the crank was ok, so I just put in new .002's as you want to do. May or may not work for you.
 
Pulling the crank is simple, if you can measure accurately (I can't), then you should measure the mains. It is likely that they too are ok. It is a lot easier to do with the engine out. If you are doing it in frame, I see your point.
 
Thanks for the input, I do have the engine out but the reson I wasnt going to pull the crank was if I did and even if it meassured out good like im pretty sure it will Im thinking then I should put in new main bearrings so guess im just trying to save a bit if I can.
 
I would have that crankshaft measured for wear at your local auto machine shop. They can determine if the crank needs to be ground undersize. They won't grind it unless it needs it. It may just need to be polished. Buy your bearings from them as they will furnish the correct bearings. I would have new cam bearings installed too. Hal
 
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