Jay
Usually, when there is low compression on cyl 2 and 3 it is a leaking head
gasket. You could try replacing it first, before tearing the engine apart.
OTOH, since you will have to pull the engine and trans to repair the trans,
that might be a good time to replace bearings and rings, at least, in the
engine.
Glenn Mapes
1968 MGB
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From: mgs-owner
To: mgs
Subject: Engine lacks compression and grinding 3rd gear; what to do?
Date: Monday, August 28, 1995 10:46PM
Hi all,
I have a '78 'B that I've nearly rebuilt from ground up. Only problem is
now my engine is ailing and my transmission is screaming for attention. I
get around 150 psi in my first and fourth cylinders, while the two middle
cylinders only give me around 100 psi. Pretty big disparity there, eh. So
what are my options. Do I rebuild the whole engine? Do I need new cylinder
sleeves, can I get by with bigger rings, or can this only be determined by
yanking the engine out and opening her up. The reason I ask is that I can
only get parts mail order, much like many of you others, and I would love to
be able to order everything at once and rebuild the whole darn thing on one
good weekend.
Second question; I am having problems with the gear change from 2nd to 3rd
or from 4th to 3rd. As I push it into 3rd, I get quite a bit of resistance
and I can feel the gears grinding. Could this be the synchro? Am I totally
off the mark? Would a repair only involve replacing maybe one gear?
Please give me some advice. If I determine that this whole project costs me
more than $750 in parts alone, I'll be forced to sell this jewel. I would
really hate to sell her, since I spent my whole summer replacing tons of
rubber parts, rebuilding brakes, and redoing the interior.
Thanks in advance,
Jay
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