Attn: glennster

I have several questions in regard to your reply to my recent post about mounting an IH hydraulic pump on my '49 M. 1- to plug the top 2 mounting holes would you use a regular #5 bolt? 2- how deep would you advise drilling the new holes? 3-- what is the consequence if you drill too deeply? The pump I have has the bottom two holes enlarged so one of the top bolts will screw into the front cover--leaving the top outside hole to be plugged and redrilled. To be sure that there is enough casting around each hole, should I plug and redrill BOTH top holes? I thank you.--Bert

you may have a problem with the bottom two holes being enlarged. those holes will set the distance of the pump drive gear to cam gear spacing. you may need to put some bushings in there to get it back to i think, 3/8 bolts so you get good contact on the drive gear. regarding the upper mounting bolts, i bought a kit some years back at an auction sale, it was a complete kit to install a live pump on them. the instructions said to install two bolts in the upper holes, grade 5 is fine, then cut them off flush, file smooth, then mount the pump and drill the holes. measure the depth of the current holes, and just go that deep. what i did to locate the center of the holes to drill, is use a drill bit that just fit inside the pump mounting holes, went in and just drilled a little to make a mark. then take the pump off and use the bit for the tap size for the bolt. if you pump has the little gear on the end to drive the hour meter, you need to saw that off. if you look at the old housing when you take it off, you will see how long the shaft is. you transfer the gear to the live pump. be sure to set the crankshaft on #1 tdc and mark the distributor so you can get it all back in time.

glennster--Thankyou, especially for alerting me about the enlarged holes on the pump and the gear contact. Enough of the original holes are evident so I can build bushings to align the pump properly. Plan to check my other tractor to see if it is an early or late M. What year did IH start using the beefed-up cam gear? Sorry I have so many questions!

Dr. Bert, I read your conversation with Glennster. I'm pretty sure M was fitted with new cam gear and new front cover beginning in 1950, forward. John

The split is a mid 1950 model year deal. Serial number 228082 and higher numbers have the improved gear and cover. Also all Sm, SMTA,and 400 450 gas will work. JimN

To JimN. and RedJohn2---Thanks gentlemen: With the help from all on the forum, I may get this tractor finished someday.