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Catastrophic oil loss - now ticking noise
Posted by wmtunate (more from wmtunate) on Sun, 5 Aug 2012 09:24:55
My wife and I drove down a dirt two-track road yesterday in my '96 9000 CSE. On the way back out to the highway, we hit a large bump and heard a loud BANG. I though it was just my old shocks bottoming out. I accelerated onto the highway, and the car bucked a couple times under load, so I pulled over and turned on a side road. As I dropped speed to make the corner, it stalled out. I looked under the engine and saw oil pouring out of the pan. We got it towed back to the house (that's a story for another time), and I temporarily patched the hole enough so that I could fill it with oil and drive it into the garage.

I only drove it a 1/4 mile after we hit the rock before it stalled, and I didn't run it again until I got 5 quarts of oil back in it. Now it's "ticking" fairly loudly from the top of the engine, much more than it did before. Idle is smooth, but I'm afraid to take it out on the road until I get the pan replaced.

First question - Why did it stall? Loss of crankcase pressure?

Second - I've read that there may now be air trapped in the valve train, and that it might manifest itself as this ticking noise. Plausible? Any other culprits I should consider? Will it go away eventually?

I should mention that I filled it with the cheapest 5W-30 dino oil just so I could get it started, since I knew it was going to all leak out. I normally run Mobil-1 full synthetic 5W-30. Could the increased viscosity be making the ticking louder than it normally would be?

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