Hi Tom,
Neither pressure nor temperatures fall within specs, which you knew.
Were you able to force water through the block and radiator with the garden
hose? If not, then that radiator should come off for a visit to radiator
shop. While it's off, remove and inspect the water pump too. The temp rise is
faster and greater than I would expect in just four miles unless water is not
circulating at all. 210 on the IR gauge is still too hot too soon. Was the rad
cap steaming?
The temperature problem could also be from a water pump that is not pumping.
Though I have not seen one, I am told that some aftermarket water pumps had
impellers that rusted away to nothing, so that there was no pumping of water.
Were you able to force water through the block so that it flowed out the
drain cock on the side?
Can you describe the knocking? This low oil pressure is probably related to
the high temperatures reducing viscosity somewhat; 20 psi at 3M rpm could be
big-end bearing-related. Less audible is excess clearance of rockers to the
rocker shaft, but this area can bleed off some oil pressure too.
Bob
---------- Original Message ----------
From: <thgun@comporium.net>
To: mgs@autox.team.net
Subject: [Mgs] MGA overheating
Date: Tue, 17 Aug 2010 11:11:02 -0400 (EDT)
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
_______________________________________________
Mgs@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe: http://autox.team.net/mailman/options/mgs/mgbob@juno.com
_______________________________________________
Mgs@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|