Some info of general interest (of particular interest to rubber bumper B
owners).
I completed the removal of the camshaft in my 77B yesterday. There are
approximately 70,000 miles on this cam. Based on the flat performance of
the car, I sought out suggestions to correct this. I was advised by
several sources that the cam shaft in the rubber bumper cars was prone to
advanced wear due to a relatively soft metal being used in it's manufacture.
I just completed a mechanical inspection of the cam lobes. The stock cam
is spec'd with 0.250" lift.
Cylinder 1 2 3
4
EXH IN IN EXH EXH IN
IN EXH
Lift: .265 .162 .208 .245 .205 .228
.190
.268
I can't explain the high readings for the two exhausts on 1 & 4. Perhaps a
bad grind. I did check them three times. Interesting the similarity
between 1&4, and 2&3.
What is not reflected in the measurements is the flat spotting, and extreme
pitting seen on 6 of the 8 lobes. In the extremes, the worst lobes don't
even appear rounded any longer. By the way, the lifters look almost new,
with no undue wear.
This certainly goes a long way to explain the lost sparkle in my engine
performance. If you are driving a late B with more than 50,000 miles on
the clock, you may want to consider this.
Regards,
Chris Delling
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