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Old 09-11-2010, 13:01   #1 (permalink)
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3L V6 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.

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 ideas what caused the loss of oil pressure?







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Old 09-11-2010, 14:40   #2 (permalink)
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Re: 3L V6 Loss of oil Pressure (with pics !)

Have you pulled the camshaft synchronizer assembly and looked at the gear? Assembly could have seized. Broke cam shaft maybe?


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Quote:
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
Missed this when I first read post.
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Old 09-13-2010, 14:31   #3 (permalink)
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Re: 3L V6 Loss of oil Pressure (with pics !)

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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