I am breaking in my recently rebuilt engine. I used the Studebaker International parts kit, which used 0.020" O/S Egge cast aluminum pistons and (as I recall) Grant cast iron rings. The tappets were badly worn on the shanks, so I included new ones. I installed a spin-on bypass oil filter.
Break-in oil is a standard 5W-30 (Chevron) plus a bottle of ZDDP additive from my local cam grinder. Before initial startup, I pressure charged the oil galleries and prefilled the oil filter cartridge. On startup, oil pressure came up instantaneously, and I idled the engine at 1,500 rpm for 15 minutes before shutting it down.
Most of the 300 mi (so far) driving has been 25-25 mph in the city, with occasional full throttle bursts up to 45 mph and full compression deceleration down the steepest hills I can find in town (not very steep). I think the rings are seated (no smoke on deceleration, acceleration, or blipping the throttle).
My plan is to drive the truck on longer trips (50-100 mi, varying speed 35-45 mph, and decelerating on compression down any hills I can find), until the total mileage is about 500. Then install a new filter and change oil to a diesel oil (Chevron 15W-40 Delo from Costco). On advice of our local cam grinder, I do not need to use ZDDP after break-in, as the stock cam is really mild. After break-in, I will assume I can cruise at a steady speed, say 45-50 mph, in recognition of the extremely low gearing of the 2R10.
Any comments for the good of the order?? Thanks!
Break-in oil is a standard 5W-30 (Chevron) plus a bottle of ZDDP additive from my local cam grinder. Before initial startup, I pressure charged the oil galleries and prefilled the oil filter cartridge. On startup, oil pressure came up instantaneously, and I idled the engine at 1,500 rpm for 15 minutes before shutting it down.
Most of the 300 mi (so far) driving has been 25-25 mph in the city, with occasional full throttle bursts up to 45 mph and full compression deceleration down the steepest hills I can find in town (not very steep). I think the rings are seated (no smoke on deceleration, acceleration, or blipping the throttle).
My plan is to drive the truck on longer trips (50-100 mi, varying speed 35-45 mph, and decelerating on compression down any hills I can find), until the total mileage is about 500. Then install a new filter and change oil to a diesel oil (Chevron 15W-40 Delo from Costco). On advice of our local cam grinder, I do not need to use ZDDP after break-in, as the stock cam is really mild. After break-in, I will assume I can cruise at a steady speed, say 45-50 mph, in recognition of the extremely low gearing of the 2R10.
Any comments for the good of the order?? Thanks!
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