I used the entire I-4 back plate, flywheel clutch, and input shaft package with the 300 motor.
To mount the engine, I had to use the I-4 front accessory drive and cover, thats where the problems came in. 300U used 1/2 dowel pins (I-4, none) and larger 1/2 bolts (I-4, 3/8) in the face of the block. I had to step down the bolt holes in the block, drill the dowell holes in the acessory drive plate and shave the dowell pins flush with the plate. The 300U's magneto drive had a slightly different bolt pattern requiring me to use the I-4's.
Outside of needing the older I-4 front cover for its engine mount, it was all straight forward.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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