I wouldn't think you have a head gasket or worn ring issue. Most MGB's
run compression from 145 to 160. I'm surprised to see 175 on any of them
- but it's not outside of what a high compression MG engine should do (see
www.mgaguru.com). With this kind of situation, I'd fix the EGR (actually,
I would plug the intake and put a little breather filter on the EGR line
off the side plate), adjust the valves, and be happy driving it. I
wouldn't even consider pulling the head at this point.
Phil Bates
> I discovered that the EGR valve was plugged on my B. I pulled the plug
> out and I see a lot of smoke in the exhaust. The plugs are a little
> black but not gunky. I get quite a bit of air pushing out of the oil
> filler on the rocker. I did a compression test and found #1 160, #2
> 155, #3 155, #4 175. The engine runs well.
>
> Head gasket, worn rings? Anyway to tell the difference other than
> pulling the head and checking the gasket or doing a leakdown test?
>
> Mike
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