Clunking While Coasting in Nuetral
1984 90 with 300tdi. I've only had the 90 for about a month, a few days back it developed a "clunking" noise and has gotten worse. The only time it happens (at least as much as I can determine) is when coasting to a stop in nuetral. Coasting in nuetral at speed, like going down a hill (not looking to start that debate), it doesn't "clunk". Coasting to a stop while keeping the gearbox in gear, it doesn't "clunk". Only when in nuetral below about 10mph.
Definitely seems to be coming from up front and not at the gearbox or tranfer box, though I can't determine left / right or differential. Differential is full of oil. I didn't check the swivels, but they are shiny, no pitting a always have a light film on them. I did pull the front prop shaft and the u-joints rotate nicely. I did not replace the u-joints, just reinstalled the prop shaft.
On a gradual grade and letting it coast, when nearly stopped, the audible "clunk" is less, but you can feel resistance / freedom / resistance / freedom... as the wheels turn.
------ Follow up post added September 12th, 2010 03:03 PM ------
Just an update....I just took it for a short drive, < 3 miles, and on return I touched the parking brake drum and it was so hot that it couldn't be touched. I can't say that this is related, but can anyone advise me how to adjust this brake? I read about a screw that is apparently adjustable externally, but I don't see this screw.
Also the "clunking" happens more frequent than one per wheel revolution as an fyi.