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Low Oil Pressure & Oil leak

I am a 944 guy helping a friend with an early (78?) 928 with low oil pressure. I know next to nothing about these cars and could use your collective wisdom.

The car has 220,000 miles on it and the engine sounds good. The low oil pressure light started coming on at idle so he put 50 wt. oil in it. Great pressure when cold but drops like a rock when hot. The light kept coming on and my friend stopped driving the car. We rigged a mechanical oil pressure gauge and when hot it reads 22 lbs at idle. When the revs are up it is in the 40 to 60 lb range. Oil pump, pressure relief valve or ?.

The other issue is that there is a pond of oil under the manifold in the valley pan. He says he has had the front cam gaskets replaced years ago but not the rear ones. Is this where the oil is leaking from and if so how difficult is it to replace all the cam gaskets?

Thanks for your help.
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Old 10-20-2011, 08:35 PM
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What is the pressure at temperature and 5000 rpm? Should be greater than 5 Bar (73 psi.) Anecdotal evidence suggests normal pressure when warm at idle is between 1.5 and 2 Bar. Since you are seeing 22 psi (1.49 Bar) I'd say that's about normal. Do the lifters rattle any? I know that I can't run less than 50 weight oil during summer or I get some lifter rattle on hot days. Could be the sender going bad. Oil in the valley is most likely from a bad breather hose or a failed gasket on the fill housing.

Last edited by ammonman; 10-21-2011 at 03:13 AM..
Old 10-21-2011, 03:04 AM
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Does it have an electric oil guage?
If so, put a manual guage in and see what it reads, some senders go bad.
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Old 10-21-2011, 03:39 AM
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Is very easy to spill Oil in that type of Oil Filler > and when you do that it collects in that spot pooling in the Vally area's
Trick: Park Car on steep hill Front End Facing Up Hill with Motor Running and Just pressure Wash all that Oil from Front to Back to remove the spilled Oil > It will just wash off the back and spill to the Ground > after It's Clean in the Valley area's wash down the back side of the Motor with the Pressure Washer > Use a Fan Spray not a Hard Direct Spray > . Do Not use Chemicals at all Just Water as the Chemicals will Damage the Seals / Gaskets .
Then Wash the rest of the Motor like the Oil Sender area with the Wire Hookups and Alternator Area's > do not Spray a Lot of Spray direct into the Alternator
************************************************
Best done on a dirt area or Driveway with a Clean out Grill
OIL PRESSURE :
Sounds Normal to me try changing the sender or go to a Mechanical Gauge.
*******************************************
Why is the Motor Running ? So it will Dry off as your washing it and not become so wet it will not have a starting issue >> just don't spray the Distributor and Coil directly and short out the running of the car
Old 10-21-2011, 07:18 AM
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Thanks for the response.

The stock sending unit reads the same as the mechanical gauge. I removed the stock sending unit and installed the mechanical gauge in the same hole to make sure it was not the sending unit or stock gauge.

Several lifters clack when hot even with the 50 wt oil. Only one clacks when cold.
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Old 10-21-2011, 07:34 AM
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Jim,
Where are you in San Diego? Lots of experience here, and we can help you out.
Neil
Rancho Bernardo.
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Old 10-21-2011, 07:44 AM
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I rebuilt a 2v motor 6 years ago: it had low oil pressure intermittent: turned out a piece of latex glove was stuck in the oil filter, semi-clogging the hole. If the motor has not been touched, probably not gonna see that in there.

Oil pumps are high-tolerance, mechanical units & 928's shouldn't have low-oil issues at all unless something is clogging the pump as I discovered: but that was due to human error & not really possible with an oil filter installed on an older engine.

I too would suspect a sticky sending unit., esp. with that many miles on the motor.
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Old 10-21-2011, 08:40 AM
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If none of the other guys suggestions pan out, It has 220K on it, bearings could be just a bit worn. I had oil in the valley too. It was coming from the oil separator lines. they were old and dry and cracked. The oil vapor that was supposed to be sucked into the intake was condensing in the lines and dripping out into the valley. Is it using a lot of oil?, you may have some blow by that is exacerbating the problem
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Old 10-21-2011, 05:34 PM
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Neil,

The car is in El Cajon at Gillespie Field in my hanger. We would like some help. PM me your phone # and I will give you a call.
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Old 10-21-2011, 08:40 PM
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Quote:
Originally Posted by Capt Squid View Post
Neil,

The car is in El Cajon at Gillespie Field in my hanger. We would like some help. PM me your phone # and I will give you a call.
Dude, you got two of us here in El Cajon. Let's hook something up. Gotta do Pumpkin Patch stuff today, but maybe tomorrow. Plus Rjm65 could probably come too.
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Old 10-22-2011, 05:14 AM
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^^^ Jim, hook up with Leo - he can help you out.
Neil
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Old 10-22-2011, 07:51 AM
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Guys,

Thanks for the offer. I am off to a race at Infineon this weekend and will try to contact you next week.
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Old 10-24-2011, 07:42 PM
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if you have oil leaking on the top of the engine,
I would first tighten the oil fill spout bolts,
remove the screen canister and tighten the bolt inside the fill housing .
Do the ones on the outside also
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Old 10-25-2011, 06:09 AM
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Is it automatic and has the flex plate drive shaft shift problem been checked?
Old 11-20-2011, 06:17 PM
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