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#1 |
Senior Member
![]() Join Date: Mar 2003
Location: Sparks, NV
Posts: 790
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new engine rebuild over heating....help
Just started the new rebuild and found it to be overheating. This is what I've found:Engine runs fine with no t-stat. I've put in 2 new t-stats and still have the same problem. T-stats are 180 degrees. The upper hose off the t-stat is cool, but the heater hoses are HOT. And the gauge is pegged. Any suggestioins?????
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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wadda yu need a thermostat fer in nevada????
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 |
Senior Member
![]() Join Date: Mar 2003
Location: Sparks, NV
Posts: 790
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LOL......we need these things here in our state.
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#4 |
Registered User
Join Date: Jul 2003
Location: north of Phx AZ about 30 miles
Posts: 698
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Are you sure you have the t-stat in the right direction? Bulb side goes to the engine. Also are you sure you have the right direction water pump? My ol' dad made both those mistakes, it was on a F**d though so thats all right. Only other things I can think of is a damaged impeller on the water pump, causing weak flow, bad sending unit(or mounted in a bad spot). Maybe try a 160* t-stat.
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Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold |
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#5 |
huh ???
Join Date: Nov 2002
Location: Fredericksburg,Va.
Posts: 3,369
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Off the wall thought, but the head gaskets could be on wrong and blocking the water passages...
Chuck
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90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!" |
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#6 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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You said you started the fresh rebuild and are having this problem.....
It's an air lock under the thermostat. That's why it will work fine without the thermostat. The closed thermstat won't allow the air to burp out of the block as you fill the radiator with coolant. The thermostat is the highest point in the block and all of the air rises to there. An air pocket will insulate the stat and keep it from seeing how hot the coolant is. The engine gets hot, but the thermostat doesn't open up. Open the new thermostat with your hands and put two or three aspirins in it to hold it open. Now install it and add coolant to the engine. The aspirins hold the stat open and allow all of the air to burp out and the engine block to fill up completely with water. Once the engine runs and the coolant circulates awhile, the aspirins will disolve and the thermostat will work normally from now on.
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I'm on the Instagram- @Gearhead_Kevin |
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#7 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Hey Tx Fire' that is one great idea! I was going to tell him to drill a small hole in the themo flange to release air. Got to try that next time.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#8 | |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Quote:
Aspirin doesn't cut skin like sharp thermostat edges do.
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I'm on the Instagram- @Gearhead_Kevin |
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#9 | |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Quote:
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#10 |
Senior Member
![]() Join Date: Mar 2003
Location: Sparks, NV
Posts: 790
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Thanks all...I will try the asprin trick as soon as I get off work.
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#11 |
Registered User
Join Date: Feb 2004
Location: Coral Springs,FL
Posts: 100
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Tx Firefighter Great Idea! Have To Add That To The Bag Of Tricks
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72 Chevy LWB leaf spring rear,SBC 385 Fast Burn,Art Carr built 700r4,3.73 Eaton posi,one piece windows,lowered 4/5.5, 60/40 seat, shaved turn signals,shaved reverse lights,shaved stake pockets, stainless steel 21gall in rear, c-notched, vintage air,ps,pb,currently doing body work. 68 Camaro conv.327,turbo 350,pb,disc brakes,built it for the wife 38 Chevy Coupe on the back burner LIFE IS GOOD! SMILE |
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#12 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,855
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mine is running hot to and I have a fresh rebuilt 350. I ran it for a while last night and then this morning when I took the upper rad hose off to remove the rad, it looked dry, like it hasn't seen any coolant yet.
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#13 | |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Quote:
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I'm on the Instagram- @Gearhead_Kevin |
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#14 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Thats a slick trick.....take 2 or 3 aspirins call the doc in the morn! What I usually do is hook the lower rad hose, & fill the block up to the bottom of the stat, then drop the stat in , bolt the housing & top hose on & fill it the rest of the way full on the rad side. Sometimes you still get a little airlock, but not bad enough to peg the guage
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