Fail PV if high-pressure oil pump??

[Michael W.]

Re: Fail PV if high-pressure oil pump??

Mike, funny thing I brought the car two years ago to PA and failed the PV but it wasn't for that. Tim never said anything about the oil pressure and he did the whole test. I don't remember the pressure being that high? I wonder I changed the oil and put in 30 wt. valvoline racing oil. I wonder if that oil could be making it higher? your thoughts? would it hurt the engine to put 10w30 in it?Bruce

You're not helping the engine by putting a straight 30 weight oil in it not does a 'racing oil' have any use on the street.

[Mike M.]

Re: Fail PV if high-pressure oil pump??

i run rotella 15/40 in all my sbc and bbc engines. mike

[Bruce W.]

Re: Fail PV if high-pressure oil pump??

no it is a 60 lb guage

[Joe L.]

Re: Fail PV if high-pressure oil pump??

You're not helping the engine by putting a straight 30 weight oil in it not does a 'racing oil' have any use on the street.

Mike------


YUP! I absolutely do not recommend the use of single viscosity oils for a street Corvette. That was OK back in the 60's and 70's but definitely not now.

[Bruce W.]

Re: Fail PV if high-pressure oil pump??

Mike, I have had the pan off before but never changed a pump. does it have to come off the engine? any thing I should be aware of? torque specifications?Thanks, Bruce

[Bruce W.]

Re: Fail PV if high-pressure oil pump??

does that have zinc in it?

[Joe L.]

Re: Fail PV if high-pressure oil pump??

Mike, I have had the pan off before but never changed a pump. does it have to come off the engine? any thing I should be aware of? torque specifications?Thanks, Bruce

Bruce------


If you mean does it have to come off the engine to change the relief spring, the answer is no. However, you should have no fear about removing the pump anyway because one bolt and it's off. It couldn't get much simpler.

[John H.]

Re: Fail PV if high-pressure oil pump??

does that have zinc in it?

Bruce -

Absolutely! CJ-4 15W40 oil has more than adequate zinc/phos (ZDDP) concentration to provide protection for any OEM valvetrain. Get rid of that straight-weight oil - it became obsolete 40 years ago (and stop listening to "engine-builders").

[Jerry B.]

Re: Fail PV if high-pressure oil pump??

What would the best choice, rebuild original old style "thick" housing", or going with a new GM. Does anyone know if NAPA stocks the correct Melling thick housing ?

[Michael M.]

Re: Fail PV if high-pressure oil pump??

no it is a 60 lb guage

Sorry Bruce. I was responding to the original poster, Stephen, who said his gauge was reading 70-80 lbs. It should read 60 max. Not sure what you have or what's correct for a 58.

Mike

[Joe L.]

Re: Fail PV if high-pressure oil pump??

What would the best choice, rebuild original old style "thick" housing", or going with a new GM. Does anyone know if NAPA stocks the correct Melling thick housing ?

Jerry------


Use a Melling #10553 and install the yellow spring that's supplied with it.

If you have an original pump it might be OK, as-is. Open it up and note if there's any wear on the bottom plate. Then, check the gears for scoring. If it checks out, it should be OK for re-use. Oil pumps are well lubricated (to say the least) and often suffer little wear even at high mileage.

[Joe L.]

Re: Fail PV if high-pressure oil pump??

Sorry Bruce. I was responding to the original poster, Stephen, who said his gauge was reading 70-80 lbs. It should read 60 max. Not sure what you have or what's correct for a 58.

Mike

Mike---

All C1 used standard pressure oil pumps.

[Michael M.]

Re: Fail PV if high-pressure oil pump??

Mike---

All C1 used standard pressure oil pumps.

Thanks for the info Joe. I was responding to the OP about his '66 L79. But I always learn a lot from all the posts I read. Now I know a little more about C1 motors. I know that some of the C2 fuelies and solid lifter small blocks had 80lb gauges. Did they have higher pressure pumps as well, or just higher reading gauges? And did the later C1 fuelies and solid lifter motors, like the 62's, have the standard pressure pumps?

Mike

[Jerry B.]

Re: Fail PV if high-pressure oil pump??

As always, thanks Joe.

[Terry M.]

Re: Fail PV if high-pressure oil pump??

Mike, I have had the pan off before but never changed a pump. does it have to come off the engine? any thing I should be aware of? torque specifications?Thanks, Bruce

Bruce,
You will find the needed torque specifications in your copy of the Chevrolet Overhaul Manual for your year Corvette.