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Thread Tools | Display Modes |
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#1 |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 329
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72 350 and TH350 troubleshooting?
New to me 72 350 temperature gauge goes higher than my comfort level. Pretty much sits on the very last line of normal or on H. Check temps at thermostat housing and various other places and it’s in the 190s to low 200s running. Turn off and it goes up to around 210-220 range. Any ideas it’s anxiety inducing to have a gauge that seems to keep going up. Should I swap the thermostat for a 160 or 180 or ?
Transmission seems to take too long like a couple of seconds to go into reverse. Anything I can do outside of an overhaul to help this? Seems to shift fine otherwise and goes into forward gears normally. |
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#2 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,221
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Re: 72 350 and TH350 troubleshooting?
Try using a 180 therm. Replace the temp. sending unit while you have it drained. It sounds like the gauge is off some.
Change the fluid & filter. If it is really raunchy drain it again after you run awhile. It has a drain plug on the pan. George |
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#3 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,728
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Re: 72 350 and TH350 troubleshooting?
I agree with others, but something about the gauge that you're not understanding.. When the ignition switch is turned off, all power is removed from the gauge. What the gauge does then is of no consequences and is not an indication of coolant temperature.. The needle is simply seeking a "comfortable place" to rest...
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#4 | |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 329
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Re: 72 350 and TH350 troubleshooting?
Quote:
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#5 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,728
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Re: 72 350 and TH350 troubleshooting?
Quote:
After the engine is shut off, the coolant continues to draw heat from the metal, but since it is not being circulated back to the radiator, its temperature has to rise.. It shouldn't reach boiling point, but it will rise. You're dealing with a gauge that's over 50 years old.. It's quite possible it's lost some of its accuracy.. 190 - 200 degrees would put the gauge in the upper range of "normal".. As long as the temperature is within that "normal" range, I don't see a problem.. BTW, the spec'd thermostat is 180*.. A 160* thermostat won't give you much heat from the heater in the winter time. |
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#6 |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 329
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Re: 72 350 and TH350 troubleshooting?
Any ideas on slow reverse engagement?
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#7 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,556
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Re: 72 350 and TH350 troubleshooting?
Keep in mind that the t-stat starts to open at the listed temp. Running temps will be ~5-20 degrees higher. Most SBCs came with a 195 t-stat.
Either get used to gauge quirks or try replacing and get stuck with the 'match the sender to the gauge game.' Lots of threads on that particular game. Changing the t-stat temp on an engine with proper operating temps isn't a good idea. Might not hurt to clean all of the gauge connections but that requires digging into the gauge cluster. 50+ year old connections can get dirty. Transmission - Being a bit slow to shift into reverse could be as simple as low fluid level or a filter that needs changing. |
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