I have to give you credit. That was a VERY good response. Right on. Couldn't
have done better myself! I learned all that while the Service Manager for a
Toyota dealership back in the 70's. In addition to intermediate shaft gears
shearing, cracked cylinder heads, burned valve seats and premature timing
chain wear, we had some similar valve train problems too (that were of
lesser severity to the other problems that I mentioned). I can't understand
how Toyota survived with all the problems that they had back then. It was
really serious! MG never had all of those kinds of serious problems - and
they DIDN'T survive. What a shame. I guess there's just no justice.
73 B Black Beauty roadster
From: firstname.lastname@example.org [mailto:email@example.com]On
Behalf Of Denise Thorpe
Sent: Sunday, June 24, 2001 8:25 PM
Subject: RE: valve noise
I'm now going to see if I can live up to all of the hype about me.
The lifters in a B are not hydraulic. I once had a cam lose a lobe
and it was so loud I was convinced I'd spun a rod bearing. B's have
naturally noisy valve trains, however there are a few things that make them
For instance, the rocker shafts wear badly. With the valve cover off,
pull a rocker sideways against the spring so that it's not riding where it
was. If the rocker shaft is worn, it will have ridges if not serious
grooves. Last time I replaced one it was $20 and it went in without much
fuss. The brass bushings in the rocker arms wear too, and you can replace
them (don't forget the oil holes!), but usually replacing the rocker shaft
care of the problem.
Also, the faces of the rocker arms wear along with the tops of the valve
stems. If they're worn, your feeler gauge is measuring the distance
between the outside edges of the rocker arm face where it's not worn, and
top of the valve. But there's more clearance where the face of the rocker
arm is worn. The clue for this one is when your feeler gauge can't slide
smoothly and comes out all scratched. You can take your valve train all
apart, have the rocker arms surfaced and rebushed, and put it all back
with a new rocker shaft. Or you can just keep adjusting the valves tighter
until the noise gets down to the sound of a sewing machine, which is
normal. But only do this if you know that it's just rocker arm wear
because you don't want your valves too tight.
How'd I do?
--- Denise Thorpe
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