I had 2 niggling problems after the head R&R. One was a pushrod tube oil leak. Seemed to be on the case end of #1 cylinder exhaust valve pushrod tube. I don’t know why it leaked, perhaps I did not expand that tube far enough when I installed the heads? Or maybe there was some dirt on the sealing surface. I did install the seals “dry”, no sealant. So to fix this leak I pulled off the rocker arm assembly on that head, pulled the pushrod from that tube, and removed the tube (large tinsnips – collapsed the rube enough for it to fall out.). I cleaned up one of the spring loaded pushrod tubes that were originally on this engine and installed it, this time with a smear of Hylomar Universal Blue non-setting sealant.
The other problem, and this one had me worried, was a scraping, rattling noise coming from the engine or transmission. You couldn’t hear it if you were standing back at the engine and revving it, it only started when the engine was warm and the van moving. Clutch in or out, or in neutral, when I was driving and revved the engine this noise was there.
I could get it to happen when parked, if I had the parking brake on hard and slowly let the clutch out in 1st gear.
It really sounded like something was rubbing against something else. My rational side was leaning towards an exhaust pipe problem, my irrational side was making up all kinds of horrible scenarios. Well, it turned out to be the forward exhaust pipe hitting the skid plate where the pipe crosses under the engine. I’m going to blame the exhaust maker, Dansk, for this. My skid plate was not bent or damaged in that area. I think the pipe was just not bent correctly. I took a heavy hammer to the skid plate and bashed out some clearance.