[Mgs] MGA overheating

[Mike Eldred]

I have never heard of a water pump impeller rusting away to nothing as Bob
says, but I'm not doubting him.  You never know what kind of junk is out
there, I guess.  I still wouldn't buy a new one without examining the pump you
have first.  If the water is not circulating, I would suspect there's a
blockage somewhere before I'd suspect a missing impeller.

Without hearing it, I would guess the knocking explains the low oil pressure -
worn rod bearings.  The valve train might "clack" due to the a lack of oil
pressure, but I wouldn't describe the sound as a "knock."

-Mike Eldred
Wilmington, VT
'54 MG TF
'73 Midget

> From: thgun at comporium.net
> To: mgs at autox.team.net
> Date: Tue, 17 Aug 2010 11:11:02 -0400
> Subject: [Mgs] MGA overheating
>
> I took the car out for another test drive. Drove about 4 miles and the temp
went up on the dash gauge to over 230 deg. f. I had a IF thermometer and the
temp at the sensor on the side of the engine read 210 deg. f. The dash gauge
seemed to be 30 or more deg. higher than the dash gauge.
> When I got home I let the car idle a while. I noticed that when I revved the
engine I could hear a knocking. I plan to take the valve cover off and check
valve rockers. The oil was about 20 pounds at 3000 rpm, road speed.
> Tom
> 1957,1500 MGA rst
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