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.
>> you can buy special stepped rings to solve this.
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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