Bricktothefuture
Member
- Joined
- Aug 11, 2015
- Location
- Central NH
Trying to figure out a really weird intermittent oil leak on my '79 w/b21F.
Noticed the leak after an oil change a few weeks ago. Had just replaced intake manifold and cleaned oil breather box by blasting it with carb cleaner, shaking, repeating, etc. Thought I'd cleaned it well. Replaced flame trap with a brand new FCP one.
Here's the thing - it seems to be a slow drip while driving/at high revs, but as soon as I stop and idle after driving, it GUSHES oil from the area of the bellhousing/maintenance plate for 5-10 seconds. After that it slows to a slow drip again. Leaves a mess on the ground, a puddle 6 inches across. Drive again, stop and idle, and the oil gushes again for a few seconds. Oddly it seems tied to the amount of driving I've done in between stops - 50 miles of driving is a giant puddle, 10 miles is a smaller puddle.
I know it isn't losing oil this rapidly while driving - I put 200 miles on the car today and the oil is still at least 3/4 up the dipstick. Pulled the inspection plate and the flywheel is dry - so that would rule out RMS. Picked up a UV kit and aside from some slight seepage from the oil pan gasket, I can't really find the source. Guessing this is some PCV weirdness but otherwise I'm stumped. And yeah, I've checked cam seal, crank, head, all the usual places oil would leak. Help!
Noticed the leak after an oil change a few weeks ago. Had just replaced intake manifold and cleaned oil breather box by blasting it with carb cleaner, shaking, repeating, etc. Thought I'd cleaned it well. Replaced flame trap with a brand new FCP one.
Here's the thing - it seems to be a slow drip while driving/at high revs, but as soon as I stop and idle after driving, it GUSHES oil from the area of the bellhousing/maintenance plate for 5-10 seconds. After that it slows to a slow drip again. Leaves a mess on the ground, a puddle 6 inches across. Drive again, stop and idle, and the oil gushes again for a few seconds. Oddly it seems tied to the amount of driving I've done in between stops - 50 miles of driving is a giant puddle, 10 miles is a smaller puddle.
I know it isn't losing oil this rapidly while driving - I put 200 miles on the car today and the oil is still at least 3/4 up the dipstick. Pulled the inspection plate and the flywheel is dry - so that would rule out RMS. Picked up a UV kit and aside from some slight seepage from the oil pan gasket, I can't really find the source. Guessing this is some PCV weirdness but otherwise I'm stumped. And yeah, I've checked cam seal, crank, head, all the usual places oil would leak. Help!