Discussion Starter · #1 ·
yeah your right. It does "pass through" some where and it is an open passage. I had to drag air hose and drop light across the driveway but it was worth it for the knowledge I gained. When I used about 30 PSI air I felt the air behind the intake and lower than the valley pan gasket. It sure is hard when it's in the truck though. I still am wondering if maybe it isn't missing on Meanmudders motors ?I am 98% positive that what I'm about to say is true: That plug just holds down the valley pan in the rear. It uses a 3/8" ratchet drive to remove it, and the square in the middle passes all the way through to allow water and other stuff that finds its way on top of the valley pan to drain away. It actually drains to the outside of the engine block, not down into the valley. This is where the fuel goes if you get a leak from the IP body and you suddenly have a puddle of fuel towards the back of the engine.
The CDR valve/turbo return hole & grommet is the separate hole just in front of the threaded plug.
To verify this you might take and blow some compressed air through the square drive hole and make sure that the passage is open and that it does indeed vent to the outside of the engine.
This is what I can't figure out, the oil was definetly coming from the square hole (i used a light and mirror) the oil was shooting at least 3"s straight up at idleI've been watching this thread, and I've got a question about the oil that had been leaking out of this plug.
Why would there be oil under pressure coming out of this plug if it's for drain purposes?? Could it be due to the original issues he has with the old motor?? (water in the oil, etc..)