While I have never seen an impeller rust off back in the early 80s there were
MG pumps with plastic impellers that would either fall off or melt off causing
over heating.
Sent from my iPhone
On Aug 17, 2010, at 9:29, Mike Eldred <redscirocco@hotmail.com> wrote:
> 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@comporium.net
>> To: mgs@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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