On Tue, 29 Aug 1995, Glenn Mapes wrote:
>
> 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.
Careful, you might end up rebuilding the engine. You can't just put new
rings in, they will just break on the ridge. If you actually mic out the
cyl you will probably find that you have to bore it out a bit and that
means new pistons, machining etc...
> Glenn Mapes
> 1968 MGB
> ----------
> 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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