Dave, may I add to that list: -poor seal between manifold and head (check for soot marks) -muffler on way out -torn muffle mounts (not readily visible, take them off for good look) Alistair on 23/2/03 7:57 pm, David Brodbeck wrote: > I can also add that droning, resonant vibrations *can* happen on a diesel > Vanagon. Mine has one at 55-60 mph...I don't have a tach so I'm not sure > what that works out to RPM-wise. I very much doubt they did that from the > factory, so I suspect mine is caused by one or more of the following > problems I've noticed on my van, which I'll be correcting in the spring: > > - Missing air intake snorkel > - Torn left-hand rubber exhaust mount > - Small exhaust leak at entrance to muffler > > Generally worn-out engine mounts are also a possibility. Mine is an '82 > so it has the rubber bushings on the carrier bars. I haven't ridden in a > Tiico so I don't know if I"m hearing the same thing, but the engine noise > seems twice as loud at 55 as it does at 50. It seems all out of > proportion to the change in RPM between those speeds. |
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