Good morning,
There are issues that we may all learn about. That is the wonder of being
human - or in my case, nearly human, where as a decaying frame may be a
better description.
Certainly a drawing exists for the PA Rocker - and I am luckily a custodian
of this drawing - outside UK.
I must say that I am quite sure that you have ample experience "in this sort
of matter". What surprises me, is that you have elected to go for slightly
second hand valves on one set and it would seem, the same with the rockers.
You make no mention of the valve springs and what seat pressure you are
running. I am sure you would know that these are a vital part of the
cylinderhead.
My advice is always, only use the very best of the new components that can
be obtained. But, as I say, we can all learn and I could be wrong.
The main reason for writing this that what you may not be aware of is that
Laverda motorcycle valves are the same stem size as our original MMM valves.
These valves were fitted with "valve caps" like many Jaguar cars. The caps
come in many sizes (thicknesses) and work very well with MMM engines & cause
no problems. They sit on top of the valve stem and can save a lot of time
in setting up the head by traditional means.
Good luck with the project.
Pip
AUSTRALIA
----- Original Message -----
From: DENKLEMM@aol.com
To: mg-mmm@autox.team.net ; Mgbbk@aol.com
Cc: bputnam@powercom.net
Sent: Friday, May 23, 2003 2:40 PM
Subject: MG PA Head
Hi All,
I've worked on a lot of different MGs and restored quite a few, but this
PA
is by far the hardest! Here is the problem.
The head was cleaned, cracked tested and new seats and guides installed.
New
exhaust valves were purchased as the intake valves were deemed as good.
The
shafts of the intake valves are various lengths within a few thousands of
each
other.
The exhaust valve shafts are all the same length as they are new. I
assembled
the cam shaft, rocker shafts and rockers (exactly in the same order they
came
off). The rocker bushings are set to they beginning position as directed
in
the manual.
All of the intake valves are long (.006 clearance to the cam) by a few
thousands. OK, fine they can be ground. The exhaust valves are short. #1
cylinder by
.070, #2 cylinder by .045, #3 cylinder by .20 and the #4 cylinder by .012.
The machine shop is trying to tell me that the rockers are worn that much
and
that different. I sure cannot see that big a difference comparing #1 to #4
rockers. Anybody got a clue as to what else to look for? Anybody got a
drawing
of a rocker?
Confused and frustrated
Dennis
PA1518
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