Is this the death knell? (Oil light on when hot) |
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Is this the death knell? (Oil light on when hot) |
PDXMike |
Jul 11 2015, 12:17 PM
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#1
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Slowly Learning Group: Members Posts: 111 Joined: 20-December 10 From: Portland, OR Member No.: 12,501 Region Association: Pacific Northwest |
I was creeping along in traffic the other day, about 89 degrees out, when my oil light started to flicker on whenever I dropped the RPM's a bit when engaging the clutch. I've always been able to make this happen if I REALLY lugged the engine down, just about stalling it, but this was unusual. It started to get the point when letting the RPM's anywhere below idle (900 or so) the light would come on, and it would even blink a little at idle. Luckily I was at my destination so I just shut everything down. I checked the oil (which was fine) but the dipstick was so hot I could barely hold it even using a crumpled up paper towel. I towed the car home and let it cool down. When I started it up to pull it in the driveway everything was back to normal. The oil light turned off quickly after start-up and would even stay off for a second or two after I stalled out the engine. How bad is this? It could be something as simple as the oil pressure sender, right? It doesn't HAVE to be horrible, does it? Or should I be thinking about what kind of great upgrades I'll make during my rebuild? -Mike |
rick 918-S |
Jul 15 2015, 06:49 PM
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#2
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Hey nice rack! -Celette Group: Members Posts: 20,457 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
I had a similar thing happen to my 928 engine in the Alien half way across country. Gauge started to drop and act funny. It was blazing hot out. I bought a plane ticket and flew home got the trailer. When I arrived home I pulled the engine thinking I damaged something. Pulled the pan and discovered what looked like coal slag but when you picked it up it crumbed and turned into a black smudge. On a hunch I brought a oil sample to a forensic testing facility. The oil was clean (no metals) but had the viscosity of 30wt. I posted the results of the test on the Rennlist forum. The consensus was I cooked the viscosity enhancers out of the oil. There were guys that reported the use of Castrol GTX 20/50 doing the same thing in sport bikes in 3 laps. They refer to it as Castrol Brown. When it cooks it turns the inside of your engine a brown tint.
I never did pull the engine apart. I put the pan back on, changed to Brad Penn and ran the shit out of it. I have now collected the parts to add an external cooler. I guess the oil is getting hotter than the coolant. |
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