I just had a used cam core reground by Erson to avoid the wonderful oil pump gear failure. My question is this. I have the matching oil pump gear that was run with this cam for 100,000 miles. I will put this gear on the Dutra reworked oil pump we have, but I do not know if I should lap the gears before installation. I was not planning on it, until I got the reground cam back and it looks like they gave it some kind of treatment. The lobes and the gear have a black or dark gray coating on them. So do I lap them in or not?

Thanks,
Rick

Thats a good question.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

The cam has been Parkerized.
Quote: Parkerizing (also called phosphating and phosphatizing) is a method of protecting a steel surface from corrosion and increasing its resistance to wear through the application of an electrochemical phosphate conversion coating. Parkerizing is usually considered to be an improved zinc or manganese phosphating process, and not to be an improved iron phosphating process, although some use the term parkerizing as a generic term for applying phosphating (or phosphatizing) coatings that does include the iron phosphating process.

In your case, I would check the mesh of the gears using a small dab of grease. If the contact pattern is well centered and even, apply a generous coating of assembly lube to the gears and go.

If the contact pattern is high / low, reposition the gear on the oil pump shaft. If the contact pattern is un-even, lap it in or try a different gear.
DD

The coating on the cam lobes and gear is to prevent galling on initial startup and aid break-in; I wouldn't lap the gear, since I wouldn't lap the cam lobes & tappets either.

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1964 Dart 225 1966 Valiant 225
1966 Dart 273 1966 Barracuda 273
1969 Dart 225
'64-170 engine '66-170 engine
(two) 198 crank/rod sets in custom-fitted wooden boxes

wooden motor scooter with hybrid-electric drive

Thanks guys.

Rick