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I thought I would post a couple of pictures of the parts I machined for doing the oil pump pressure relief valve modification.
I tapped the oil pump body with a 22 x 2.5 mm tap only because I already had it and it would work. If I was buying a tap to do this job I think I would step down on the thread pitch to 2.0mm so that it wasn't so coarse.
I machined the bushing from 1.0625 dia. 6061 alum. and tapped the hole for the set screw 5/16 18. The set screw spring seat is made from drill rod. The ball bearing dia. is .750 inches
I adjusted the oil pressure by mounting the pump in a 2L front cover that I had modified by blocking off the oil filter mount and tapping the injection pump oil galley for a pressure gauge fitting. I then mounted the front cover to an Alfetta pan with a qt. of oil in it and drove the oil pump with a distributer with the advance mechanism removed powered by a half inch drill. Since this pump was going in the Lemons car which has a stock motor I adjusted the pump for about 90psi max.
I tapped the oil pump body with a 22 x 2.5 mm tap only because I already had it and it would work. If I was buying a tap to do this job I think I would step down on the thread pitch to 2.0mm so that it wasn't so coarse.
I machined the bushing from 1.0625 dia. 6061 alum. and tapped the hole for the set screw 5/16 18. The set screw spring seat is made from drill rod. The ball bearing dia. is .750 inches
I adjusted the oil pressure by mounting the pump in a 2L front cover that I had modified by blocking off the oil filter mount and tapping the injection pump oil galley for a pressure gauge fitting. I then mounted the front cover to an Alfetta pan with a qt. of oil in it and drove the oil pump with a distributer with the advance mechanism removed powered by a half inch drill. Since this pump was going in the Lemons car which has a stock motor I adjusted the pump for about 90psi max.
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