Another source of the problem may be that the rocker adjusters are too
short. There are two types of adjusters: one with a hole through them and
the other is solid. The solid adjusters are also about 1/8 " longer. I had
to change to the solid adjusters when I installed a high lift cam because
the adjusting nuts were on the last 1-2 threads of the adjuster when I used
the ones with a hole in them.
Another area to check if you are using a Marina crank is to be sure the hole
for the pilot bushing is large enough for the first motion shaft. A friend
of mine found this out the hard way when he went to mate the motor to the
transmission and found the pilot bushing hole in the crank was much smaller
than the diameter of the first motion shaft. He had to disassemble the
entire engine and have the hole enlarged.
Hope this helps
Glenn Mapes <gmapes@ball.com>
1968 MGB
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From: mgs-owner
To: mgs
Subject: MBG Pushrods, et. al.
Date: Wednesday, August 02, 1995 9:16PM
A friend of mine is building an engine for his '74 MGB. The short block
assembly is from a '74 Austin Marina 1800 (18V engine) the head is from
an MGB (possibly an earlier '18GB' type) and he is using an aftermarket
cam and lifter (cam follower) kit with 10.5" pushrods.
The problem is the pushrods are not long enough to allow him to adjust
the valves. It appears as though the pushrods are about 0.375" too short.
The shop that sold him the cam insists that he has the right lifters also.
Questions:
Are there any differences between blocks and heads of different years that
would cause this problem?
Are there any pushrods that are about 10.875" available?
Are there any lifters that would give the necessary additional 0.375"?
Any other ideas?
Thanks,
Dave Morris
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