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Username Post: Over heating        (Topic#358389)
Clarke57 
"14th Year" Silver Supporting Member
Posts: 50
Clarke57
Loc: Victoria B. C. Can.
Reg: 01-26-08
10-09-19 07:03 PM - Post#2777514    

My 57 Chevy over heats at idle during long lights, heavy traffic or construction stops. I would like to try a smaller diameter pulley on the water pump on my small block 350 crate engine with a short pump. At 30 mph and faster, it runs at a cool 190 degrees. Stopped for any time for construction zones, or heavy traffic you can see the temp. gauge rise to 230 degrees in a few minutes. I have a 4 core radiator, a shroud, and use a 185 degree thermostat. Any ideas on where to purchase a 5 to 6 inch water pump pulley? Thanks for any info. Gary



 


bobb 
Super Senior Member
Posts: 5481

Loc: paradise
Reg: 09-05-03
10-09-19 08:48 PM - Post#2777520    
    In response to Clarke57

what kind of water pump do you have?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
GreatNorthWoods 
"5th Year" Silver Supporting Member
Posts: 1048
GreatNorthWoods
Age: 77
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
10-10-19 05:03 AM - Post#2777537    
    In response to Clarke57

Four row radiators are harder to get air through than two or three row. Had a similar problem years ago with a 4-row Walker in a 29 Ford. Engine (350) would run 180 all day at speed but would climb to 220 when idling. It took me awhile to get used to seeing 220 on the temp gauge but it didn't seem to hurt the engine any and it never boiled over. Even at 230 if it doesn't boil over you are probably okay. Perhaps a fan with more blades would do the trick. Sometimes it helps to seal up places where air can go around the radiator instead of going through it.

Vern

1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, Vintage Air, EZ Wire, Ididit column, Cruise/Tilt, 59 Vette Steering Wheel, 4-Wheel Disc Brakes, Posies Springs, Coker Radials, Nova 10-bolt, Mustang II front, Continental Kit


 
2blu52 
"18th Year" Silver Supporting Member
Posts: 19027
2blu52
Age: 86
Loc: Montana
Reg: 03-12-02
10-10-19 04:15 PM - Post#2777601    
    In response to GreatNorthWoods

220 degrees may not be excessive if you are running a proper pressure cap.

"PEACE IS THAT GLORIOUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1141
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
10-10-19 07:42 PM - Post#2777614    
    In response to Clarke57

The water pump pulley is about 6.4" with 1/2" v- belt grooves.
I have the same issues, so I was looking at pulleys also.
The only thing I found was a 3 groove water pump pulley that the two inner groves were the 6.4", but the outer groove was much smaller. But more than likely you are in the first crank groove with your water pump belt so it will not work, all I saw out there.
Only other option would be the hi flow water pump some after market places sell, so I bought one, it did not make any difference, increased traffic through the radiator was not even noticeable at idle.

VC56S 2 door Sedan, 39 Years



 
bobb 
Super Senior Member
Posts: 5481

Loc: paradise
Reg: 09-05-03
10-11-19 08:10 AM - Post#2777655    
    In response to Clarke57

got pics?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
4dr 57 
Valued Contributor
Posts: 4624

Loc: Texas Hill Country
Reg: 11-10-04
10-29-19 07:34 AM - Post#2779030    
    In response to Clarke57

Should we assume you have tuned the carburator's fuel mixture, the distributors initial timing/idle advance/vacuum advance is all good?

Is the crate motor a vortec engine?

It's all good. mostly




 
YOUNG57 
Frequent Contributor
Posts: 1154

Loc: Tennessee
Reg: 12-06-10
10-31-19 04:09 AM - Post#2779184    
    In response to 4dr 57

Is your vacuum advance full intake vacuum or ported carb vacuum?
What is your initial timing advance?
Both effect idle temps.

Standard equipment pulley sizes:
Single groove crankshaft pulleys are 6 3/4” diameter and water pump pulleys are 7” diameter
Under drive, water pump turns slower than crankshaft
Double groove crankshaft pulleys are 7 3/8” diameter and water pump pulleys are 6 3/8” diameter
Over drive, water pump turns faster than crankshaft




 
Clarke57 
"14th Year" Silver Supporting Member
Posts: 50
Clarke57
Loc: Victoria B. C. Can.
Reg: 01-26-08
10-31-19 02:15 PM - Post#2779240    
    In response to YOUNG57

Thanks for your interest and questions. The vacuum advance comes off of the base of my Edlbrock carburator. I have given up on a smaller pulley and I'm going to move rad into 6 cylinder position and buy a 3300 cfm puller fan from Danchuk. Cheers, Gary



 
Clarke57 
"14th Year" Silver Supporting Member
Posts: 50
Clarke57
Loc: Victoria B. C. Can.
Reg: 01-26-08
10-31-19 02:18 PM - Post#2779241    
    In response to bobb

Hello Thanks for your answer. Tried an Edlbrock water pump and a new gm made water pump. Same result on both. Going for a electric puller fan Cheers, Gary



 
Clarke57 
"14th Year" Silver Supporting Member
Posts: 50
Clarke57
Loc: Victoria B. C. Can.
Reg: 01-26-08
10-31-19 02:21 PM - Post#2779242    
    In response to 2blu52

230 degrees and north is the problem. Given up on smaller pulleys size. Going to 3300 cfm electric puller fan and moving rad to 6 cylinder position. thanks for contacting me. Gary



 
Clarke57 
"14th Year" Silver Supporting Member
Posts: 50
Clarke57
Loc: Victoria B. C. Can.
Reg: 01-26-08
10-31-19 02:26 PM - Post#2779243    
    In response to GreatNorthWoods

Tried a 7 blade corvette fan but did not have a shroud for it. I went back to original 4 blade fan with shroud. That worked a little better. I'm down to buying a 3300 cfm Electric puller fan and moving the rad to the 6 cylinder position. Thanks for your interest. Gary



 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1141
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
11-02-19 11:14 AM - Post#2779378    
    In response to Clarke57

I'd try the plug in box fan in front of rad pushing, see if it works,
Made no difference on mine still tried to over heat,
Did compression check, 190-195 psi on all 8 cylinders,
So not a blown head gasket, cracked block or cracked head.....
Then I found it...........
Distributor gear ate up!!
Bronze nickel gear half way gone......


Attachment: image.jpg (156.19 KB) 2 View(s)




VC56S 2 door Sedan, 39 Years



Edited by Bad56Sedan on 11-02-19 11:15 AM. Reason for edit: No reason given.

 
Mel Foye 
*VIP* Founding Member
Posts: 4905
Mel Foye
Reg: 09-29-00
11-02-19 03:04 PM - Post#2779393    
    In response to YOUNG57

Years ago David I was checking out radiator manufactures and their thinking. Several recommended a 15% overdrive on the WP. Your second example comes out to 14.x. Slow moving water encourages higher temps. Hope folks learn from your post. Mel



 
56sedandelivery 
Dedicated Member
Posts: 5687
56sedandelivery
Age: 68
Loc: Everett, Wa.
Reg: 02-26-08
11-07-19 01:28 PM - Post#2779736    
    In response to Bad56Sedan

  • Bad56Sedan Said:
I'd try the plug in box fan in front of rad pushing, see if it works,
Made no difference on mine still tried to over heat,
Did compression check, 190-195 psi on all 8 cylinders,
So not a blown head gasket, cracked block or cracked head.....
Then I found it...........
Distributor gear ate up!!
Just curious on why the bronze gear? Retro-roller cam or roller cam setup block? That gear is all but gone; concerns about the metal through the engine? I have an old dual point distributor I was planning to use, but it has a bronze gear on kit. HV/HP oil pump or thick oil?
Thanks. I am Butch/56sedandelivery.
Bronze nickel gear half way gone......








 
YOUNG57 
Frequent Contributor
Posts: 1154

Loc: Tennessee
Reg: 12-06-10
11-08-19 06:28 AM - Post#2779770    
    In response to Mel Foye

Bad56Sedan, I think your house plug-in box fan test is a great idea before going to the trouble and expense of moving the radiator and installing an electric fan.

Mel Foye, thanks for vindication of what seemed obvious to me, but not everyone.




 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1141
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
11-08-19 11:31 AM - Post#2779784    
    In response to 56sedandelivery

I really don't know why this distributor had a bronze gear.
Cam is cast iron Comp 292H that does not require a bronze gear.
Yes maybe more issues on the way.
Although oil pressure is back up at about 60PSI at idle and it is not over heating.

VC56S 2 door Sedan, 39 Years



 


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