[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
On 5 May 2002, at 15:52, Russ wolfe wrote: > The late model heads have the rocker mounting studs screwed into the > head right below the rocker arm. The early versions had a stud that was > about 3"-4" long that the threaded portion was buried that far into the > head. > When the old heads expanded in the heat, the steel stud didn't expand as > much, therefore the valve lash closed up as the engine got hotter. the > later heads, the rocker arms moved with the head with heat expansion. > There was a modification to the early heads that converted them, and > most of them were converted over time. This would only make sense if it were true that the alum of the head, which would be shaped sort of like an inverted U with the stud thru the ends of the U, was being put under stress (bent) by the stud as the head (the U) tried to expand with temp. I suppose this must be what is happening. No wonder that design failed.... - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe