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Old 09-11-2010, 10:59 AM   #1 (permalink)
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Default Loss of oil Pressure (with pics !)

I havn't figured out why the loss of oil pressure yet, but here's the history:

1/ oil light came on
2/ driver continued on for a few miles until engine seized when he idled down
3/ pics show 2nd rod bearing babbit seized to crank (I can polish it !!!...maybe....). Bearings had spun...tangs gone
4/ oil pan was full of oil
5/ oil pump tested by hand and pumps fine
6/ oil pump driveshaft intact
7/ installed oil pump drive shaft from underneath. Would not turn, so cam sensor seems OK. Turned engine by hand, and oil pump driveshaft turned properly
8/ oil filter was last part removed....comletely empty...no oil.....not a drop....very weird...something I can't explain, other than perhaps the engine rotation drew oil out of it?

I'm wondering if there are any press-in plugs in the oil galleries between the oil pump and the filter, but I still suspect the cam position sensor as my only test on it so far was pretty Mickey Mouse.

Any other ideas what caused the loss of oil pressure?







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Old 09-11-2010, 08:03 PM   #2 (permalink)
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Failed cam syncronizer. Was there a squeaking? I'm almost positive that is the cause. if the fails it stops the oil pump from working and from there its failure. It can seize then unseize and make it seem like failure didn't occur. That's why I'm adamant about others changing their syncro when the first sign of trouble appears. When I pulled my syncro it would seize under certain conditions when I bench tested it.
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Old 09-11-2010, 09:39 PM   #3 (permalink)
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That's about all I can think of too, but the totally empty oil filter puzzles me the most.

I wasn't the one driving, but I did drive it just before this mess and there wasn't any squealing.

So what siezes? I'm having a hard time envisioning this. I picture the cam sync like the lower part of a distributor, so all I can picture are worn teeth on the sync gear, or on the cam gear.

I will pull the sync, but other than missing or worn teeth, I"m not sure what seizing means in this case, so am unsure what to look for.
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Old 09-12-2010, 03:04 PM   #4 (permalink)
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Look down the hole and see if the cam gear still has teeth on it.
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Old 09-13-2010, 04:31 PM   #5 (permalink)
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I've found out more. I checked 4 of the 6 rod bearings and all are bad....most are spun....some rod journals are beyond a simple clean-up. However, all main bearings are like new.

The cam synchronizer is perfect as well as the cam gear teeth. It's all starting to look like the engine was over-revved, a rod bearing let go, and then the oil pressure dropped causing the other rod bearings to go.

A few pointed questions to the driver, and it turns out there was an over-revving condition a little before the idiot light came on. Apparently the transmission was set to "Low" to see if the front tires could be spun and the revs got a little high.

So does that make sense, ... mains OK, rods all gone, and due to over-revving?

Unless I find something up top broke and allowed the oil pressure to drop off, I'd say it was due to the over-revving. 16 year olds.......smart enough, but don't always use the brain they've got......tough to be a teenager I guess.
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Old 09-13-2010, 10:27 PM   #6 (permalink)
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Uh huh.... nice.

Kids.
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Old 09-15-2010, 11:06 AM   #7 (permalink)
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Here's a little skit I made up......

All we can do is laugh now.

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Old 09-15-2010, 12:38 PM   #8 (permalink)
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LOL, that is very funny! I can remember trying to explain my way out of how the motor mount broke in my Dad's car when I was in high school and it wen't almost like that
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Old 09-16-2010, 06:54 AM   #9 (permalink)
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The engine has a rev limiter on it so over revving should not be the cause.

How was the oil pick up screen? The pump should be filling the galleys before the filter. There is an internal pressure relief spring that should bypass the filter if pressure gets too high.

If the filter is dry the pump isn't pumping.
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Old 09-16-2010, 07:14 AM   #10 (permalink)
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I do believe the filter must have drained back as the car sat for quite a few months before I took the oil pan off.

The Main bearings still looked like new and had oil on them.

All the rod bearings were either spun or worn away with dmaged crank rod journals.

Oil pump was bench tested and is OK.

Screen was free and there wasn't much sludge in bottom of pan.

Oil pump drive shaft was OK

Cam sync was fine

Cam gear teeth look fine

Pan was full of oil

Driver admitted to high revving and then oil light came on a few minutes later.

A rev limiter might limit revs with an engine under load....like during a 1/4 mile drag, but I'm not so sure the engine will stop at a certain rpm when it's acclerated hard in say neutral....so in low gear it might oevershoot as well....even if just for a moment under momentum.

Maybe something else gave way and caused the low oil pressure, but I think there was some oil flow as the driver made it a few miles with the light on before it seized.

Over-revving that old engine is the only thing that makes sense to me so far.
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