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> Oh no! Lost oil pressure ...
SirAndy
post Feb 15 2018, 08:38 PM
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Got stuck in traffic on my way home from work today and didn't notice the oil light until the engine started making horrible noise.

Did the only thing i could think of which was to pull onto the side strip and get on the gas hoping to get oil pressure back.
That actually worked!

Pressure went back up to ~80 under load and ~30 at idle for the rest of the drive home but i'm afraid i might have done some permanent damage.

By the time i noticed the engine noise and the pressure being at zero i was probably already running completely dry.
(IMG:style_emoticons/default/headbang.gif)

Now the real question is, how the heck did that happen?

I checked the oil after i got home and it's still all in there. All 16 quarts of it.
Could there be a blockage somewhere? Stuck piston? Clogged filter?
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mepstein
post Feb 15 2018, 08:58 PM
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QUOTE(SirAndy @ Feb 15 2018, 09:38 PM) *

Got stuck in traffic on my way home from work today and didn't notice the oil light until the engine started making horrible noise.

Did the only thing i could think of which was to pull onto the side strip and get on the gas hoping to get oil pressure back.
That actually worked!

Pressure went back up to ~80 under load and ~30 at idle for the rest of the drive home but i'm afraid i might have done some permanent damage.

By the time i noticed the engine noise and the pressure being at zero i was probably already running completely dry.
(IMG:style_emoticons/default/headbang.gif)

Now the real question is, how the heck did that happen?

I checked the oil after i got home and it's still all in there. All 16 quarts of it.
Could there be a blockage somewhere? Stuck piston? Clogged filter?
(IMG:style_emoticons/default/sad.gif)

That sucks. I would cut open the oil filter and look for gold.
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flyer86d
post Feb 15 2018, 09:07 PM
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Yes, I agree. Cut the filter open.

What would starve the pressure pump?

Charlie
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MartyYeoman
post Feb 15 2018, 09:08 PM
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Ouch (IMG:style_emoticons/default/sad.gif)
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aharder
post Feb 15 2018, 09:10 PM
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That does suck !! Hope there's not any major damage
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toolguy
post Feb 15 2018, 09:15 PM
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The oil filter canister should have a spring for oil bypass if it gets clogged so that probably isn't it. . The oil filter base assembly has a pressure bypass also. . Scavenge pump and pressure pump are always turning so oil should be returning to the oil tank always . . . the bypass valve on the side of the engine case is the over pressure bypass valve that bleeds off excess pressure right out of the oil pump . . there is another over pressure on the bottom of the sump which is the end of the oil supply galley. . . either of those could bleed off some pressure but i wouldn't expect a total loss that returns when you reved the motor. . that is puzzling. .
I would pull the sump cover off and see if the wire screen is plugged at the oil inlet tube.
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MarkV
post Feb 15 2018, 09:25 PM
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If after the event you had 30 psi at an idle I wouldn't think you damaged bearings? What was the idle pressure before the event?
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SirAndy
post Feb 15 2018, 09:29 PM
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QUOTE(MarkV @ Feb 15 2018, 07:25 PM) *
If after the event you had 30 psi at an idle I wouldn't think you damaged bearings? What was the idle pressure before the event?

Same as after, about ~30 at idle and ~80 under load ...
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PS: Also should mention, the noise went away once the oil pressure came back up, but it sure was a loud mechanical noise like a bad bearing or a valve hitting a piston
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Chris914n6
post Feb 15 2018, 09:31 PM
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3.6L right?
Hydraulic lifters? Hydraulic cam guides? What do you think the noise was?
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SirAndy
post Feb 15 2018, 09:32 PM
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QUOTE(Chris914n6 @ Feb 15 2018, 07:31 PM) *
3.6L right?
Hydraulic lifters? Hydraulic cam guides? What do you think the noise was?

Doh, yes, could it be that the lifters ran out of oil???
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Krieger
post Feb 15 2018, 09:33 PM
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This may be stupid, but was the engine about to die because of some sort of idling issue? Hence the noise and green light on. Maybe some shaking?
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SirAndy
post Feb 15 2018, 09:34 PM
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QUOTE(Krieger @ Feb 15 2018, 07:33 PM) *

This may be stupid, but was the engine about to die because of some sort of idling issue? Hence the noise and green light on. Maybe some shaking?

Nope, the engine was running ok through all of it, no shaking. Oil pressure was at dead 0 though ...
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Krieger
post Feb 15 2018, 09:46 PM
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From my wondrous experience with my 3.0L I learned a lot. I couldn't get oil out of the case fast enough and the extra 3-4 quarts in the engine sump really slowed the motor a lot. I could feel the loss of power. There also was evidence near the breather on top of the case for this. It doesn't sound like this was you problem and it didn't leak out. My thoughts would be why a full tank of oil wasn't making it to/through the pump, or how am I bleeding ALL the pressure.
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Krieger
post Feb 15 2018, 09:56 PM
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Hope this is helpful.


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SirAndy
post Feb 15 2018, 10:04 PM
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QUOTE(Krieger @ Feb 15 2018, 07:56 PM) *

Hope this is helpful.

Well that explains it, i was running everything upside down!
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sixnotfour
post Feb 15 2018, 10:32 PM
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youve had a good run on that 3.6...time for case through bollt o rings rod bearings bolts, rod bearings, rings, valve job..min,,good catch , 90% sure you have at least one or two thin rod bearing...the way of the 3.6,,If it not leaking ouut the #8 or partingline..
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914_teener
post Feb 15 2018, 10:34 PM
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I vote for dissecting the Oil filter.

Car sitting a while Andy?

Sludge into an oil passage and rev cleared the sludge?
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SO.O.C914er
post Feb 15 2018, 10:35 PM
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Andy if you were running everything upside down I would think the pressure on your head would have been unbearable! (IMG:style_emoticons/default/av-943.gif)
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Mueller
post Feb 15 2018, 10:57 PM
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What 911 did the motor come out of? If 964 based I thought those are solid lifters.
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SirAndy
post Feb 15 2018, 11:05 PM
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QUOTE(Mueller @ Feb 15 2018, 08:57 PM) *
What 911 did the motor come out of? If 964 based I thought those are solid lifters.

'95 993, last of the true air cooled ...
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