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Old 05-15-2011, 10:58 AM
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Oil Pump Problem

I purchased a 1968 327 engine that was "freshened up", new cam & lifters, HV oil pump, Edelbock intake and carb. He said the oil pump was acting funny so he returned it to Summit for an other one. Worked OK for a little while - 50 psi , 25 or so at idle. Now it has very little pressure at idle and only shows 25 at higher RPM. What are the possibility's ? I have new electric gauges, and oil is at full level. I'm stumped.
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Old 05-15-2011, 11:09 AM
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I would start with a mechanical gauge to see if it varies from the electric first.The possibilties are numarous as to why the pressure has dropped.Did it drop suddenly or gradually?Or did you change to the electric gauge and then noticed it?
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Old 05-15-2011, 11:24 AM
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Quote:
Originally Posted by lwin517
I purchased a 1968 327 engine that was "freshened up", new cam & lifters, HV oil pump, Edelbock intake and carb. He said the oil pump was acting funny so he returned it to Summit for an other one. Worked OK for a little while - 50 psi , 25 or so at idle. Now it has very little pressure at idle and only shows 25 at higher RPM. What are the possibility's ? I have new electric gauges, and oil is at full level. I'm stumped.
If it has good oil pressure at startup when cold and drops to very little when warm, it may be bearing clearance issues. But I would check everything else out first (gauges, electrical, etc.) before turning there. There really isn't any need for a HV oil pump on this motor. You could use a stock pump and be fine.
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Old 05-15-2011, 06:20 PM
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Oil pump

Take a look at the rear cam bearing to make sure it's installed correctly. It may be the narrow bearing and not installed far enough in the block. Been there, done that. Exact same symptoms !!!!!!!!

Ron
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Old 05-15-2011, 07:27 PM
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Quote:
Originally Posted by Ron Golden
Take a look at the rear cam bearing to make sure it's installed correctly. It may be the narrow bearing and not installed far enough in the block. Been there, done that. Exact same symptoms !!!!!!!!

Ron
Ron; That is a very good, but most forgotten bit of information.

Also pull the oil filter off, and the oil filter adapter. The oil pressure relief check valve could have a piece of debris, such as silicone, or an errant piece of gasket scraping material holding it open.
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Old 05-16-2011, 01:58 AM
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Also can be a symptom of running a Fram oil filter.
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Old 05-21-2011, 06:59 PM
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OIl pressure problem.

Quote:
Originally Posted by oldschool hero
I would start with a mechanical gauge to see if it varies from the electric first.The possibilties are numarous as to why the pressure has dropped.Did it drop suddenly or gradually?Or did you change to the electric gauge and then noticed it?
OK, I installed a mechanical gauge. When I started the engine It showed almost NO pressure. When it idled for 20-30 seconds the pressure slowly went up to 20 psi. When I rev up the engine it drops to almost zero again. The oil only came about half way up the tubing. Let it idle down, pressure goes back up to 20-25 PSI. Going to have to pull the engine because there is not enough clearance to drop it installed. Don't get why it dropa at higher RPM.
Thanks,
Larry
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Old 05-21-2011, 07:44 PM
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Do you have a Fram oil filter on it? If so, change it to some other brand.

If not a filter problem, I'd blow out the oil galley that supplies oil to the gauge. I'll bet there is something restricting the supply of oil to the gauge.

Think of this, an engine with hydraulic lifters needs oil supply to keep the lifters pumped up. If oil pressure goes to zero for any time at all you will hear the rocker arms begin to make noise, then you will hear noise from the bottom end.
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Old 05-22-2011, 06:06 AM
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If thats a small journal and you have a HV pump you should have plenty of pressure at any RPM, also if you have to much oil in the pan this may cause you problem.

Sounds like some thing is off with your clearances or one of the galley plugs maybe missing in back of your timing gear!
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