H or M motor ?

Tue Nov 20, 2007 11:46 pm

HI, I have an old Gallion road grader and it has either an H or M motor. It has a rod knocking I need to fix it. I do not know the difference between the two, any one have pics of these motors ?

John

Wed Nov 21, 2007 9:28 am

I'd bet money that the engine is an M. The H and the M engines are nearly identical in appearance, except the M is much larger. It might be easier if you could post a close-up pic of what you have? Or maybe take some measurements? I guess one quick way would be to measure the length of the manifold, from one end to to the other.

Wed Nov 21, 2007 9:31 am

If you can get a casting number or part number from the block someone will know whether it is an H or M block. I agree with Rustyfarmall - I'd bet on an M.

Wed Nov 21, 2007 9:41 am

There should be a part number on the block in behind the oil filter.

Wed Nov 21, 2007 10:55 am

Engine block part numbers may be different than on a tractor, makes them a little hard to look up. An easy visual clue is the small casting above the governor. On the H it is pretty short and a lot taller on an M. Look at the last picture on this page to see that the H part looks like.
http://www.geocities.com/Heartland/Fiel ... allH7.html
And look here for an M.
picture. http://home.cshore.com/astroman/farmall ... mg02bb.jpg

Thu Nov 22, 2007 12:09 am

Jim Becker wrote:Engine block part numbers may be different than on a tractor, makes them a little hard to look up. An easy visual clue is the small casting above the governor. On the H it is pretty short and a lot taller on an M. Look at the last picture on this page to see that the H part looks like.
http://www.geocities.com/Heartland/Fiel ... allH7.html
And look here for an M.
picture. http://home.cshore.com/astroman/farmall ... mg02bb.jpg



Jim,

Thanks for the pics, the manifold on the M looks like what I have, I will check the height of the gov. housing to be sure. Im sure that my Case dealer will be able to get me a set of rod bearings. One of my emplyees the last time he started it, had it at full throttle and it started to rap very loud. He immediatly shut it off, so if it did spin a bearing, i hope it didnt gauld the crank.

John

Thu Nov 29, 2007 3:02 pm

I really hate to admit this... but I was wrong, according to Jims pics, it has the short gov. housing so it is an H motor.

Thu Nov 29, 2007 10:19 pm

John,

There are alot of M or H motors out there in salvage yards. Shouldn't be too hard to find a donor to replace the motor with if it is too far gone. Real easy motors to work on.

Sat Dec 01, 2007 8:09 pm

I was curious,--What is the model of your Galion grader! thanks; sonny

Sun Dec 02, 2007 12:13 am

Sonny, I think its a 402, The year of it is mid 40s ill check Monday to be sure. Its not ant my house.

John

Sun Dec 02, 2007 1:55 am

I wasn't able to find a 402,---but there is a model 104----early 50's date.--could that be it?--they show it as having a IH diesel motor in it, BUT, even so, that would make your gas motor an M, gasser!--if diesel then it could be a MD motor,--only the industrial version! ---just trying to help here!! thanks; sonny

Sun Dec 02, 2007 8:44 am

Sonny,

A 106 is a tandem rear wheel grader. Mine is a smaller single wheel. I will get the info on it Monday.

John