It depends on where the bolts go. For example, The clutch pressure plate and the clutch housing can be grade 5. Those are all 3/8 in. bolts, so torque would be 25-30 lbs. Bolts for motor mounts can be grade 5 or 8; either one is OK since the bolts are only holding the motor on the frame rails. You didn't mention cylinder head studs, but they would be grade 5 also, with maximum torque on cylinder head about 75 lbs. In general, I would use grade 5 on all replacement bolts. I torque everything when reassembling. Follow torque values according to bolt size. Hope this helps.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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