Interesting.
Did these symptoms develop suddenly or over time? That's part of the
equation.
Normally a stuck shut thermostat would give you a cool radiator.
A collapsed hose would give you a cool radiator.
The extraordinarily rare problem of an impellor falling off a water pump
would give you a
cool radiator.
However, a radiator that had become gradually corroded and less effective
might give you about the symptoms you have here.
A cool 160deg thermostat might help. Putting the thermostat in a pan of
water and using your machine to see when it opens might show that its
opening at too high a temp....just some things to look at.
Some kind of excessive lean condition or too much spark advance might give
you this, but the car would probably knock and run bad also.
That's my armchair engineering answer!
Tell the list what it is when you figure it out.
If you get the rad re-cored, might want to add a row of cooling coils.
Best Regards,
Jim
Chesapeake, Virginia
>From: Ritchie Labate <rlabate@sbcglobal.net>
>Reply-To: Ritchie Labate <rlabate@sbcglobal.net>
>To: Datsun Roadster blog <datsun-roadsters@autox.team.net>
>Subject: Radiator/hose/block temperatures
>Date: Thu, 3 May 2007 15:51:27 -0700 (PDT)
>
>Hey everyone,
>
> I'm trying to diagnose some overheating on my '68 2000 (Stock engine,
>electric fan). The temp guage usually passes the midway mark, sometimes
>approaching, but not reaching the 240 mark, then I shut it down.
>
> Using an infrared thermometer, I measured the following:
>
> Radiator- 205' throughout various locations
> Upper/lower rad hose- around 190'
> Engine block- 225'
> Valve cover- 170'
> Thermostat housing- 190-200'
>
> Questions:
> 1. what are normal temps for the above? Radiator?
> 2. theoretically, should the thermostat housing register the same temp
>as the preset thermostat? (ie 160 or 180, I don't know whats in there)
> 3. is the engine block temperature really that high?
> 4. where should the temp gauge register under normal operation?
> 5. where do I start? new thermostat, recore rad?
>
> Thanks, folks!
|