Author Topic: Lower Radiator Hose  (Read 7736 times)

mrdetails

  • Member
  • ***
  • Posts: 164
    • View Profile
Lower Radiator Hose
« on: December 06, 2010, 05:04:01 PM »
I've had nothing but trouble with my lower radiator hose since finishing my car. I've had 2 resto. GM hoses that the parts vendors sell. I think their made in Pakistan. Both leaked with either a tower clamp or a sew type clamp and permatex. What do you guy's use?

Thks.:
Sam

The spell check feature is nice.......

vtfb68

  • Hero Member
  • *****
  • Posts: 527
    • View Profile
Re: Lower Radiator Hose
« Reply #1 on: December 10, 2010, 05:41:56 AM »
Sam,
 Rust on the water pump? Radiator bung cracked? Thermostat and cap O.K.? I have never needed a sealer on a radiator hose.
  Victor
68 05C LA RS/SS U2 712 L34 M21 BR
68 08E LA RS Y2 749 L30 M35
67 11B LA  RS/SS M-1 797-Z L48 M21  Convertible

BlackoutSteve

  • Member
  • ***
  • Posts: 397
    • View Profile
Re: Lower Radiator Hose
« Reply #2 on: December 10, 2010, 02:52:12 PM »
If the leak it at the pump end, check for cast flashing and make sure it's clean & smooth.
If at the radiator, check that the outlet tube is also clean and round and not dented. Any low spot in the neck will not see pressure from the clamp.
Check that the inside of the hose is smooth and has no scars from previous fitting.
Fit the hose clean and without any sealant. Make sure the inner spring is not between the hose and the neck.
Fit the hose clamp just behind the neck's bead.
I have never used or needed sealant, nor gave I ever seen it suggested in any manual. :)
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840

mrdetails

  • Member
  • ***
  • Posts: 164
    • View Profile
Re: Lower Radiator Hose
« Reply #3 on: January 04, 2011, 04:54:07 PM »
Thanks for the input guys..all those things have been checked. The hose swells up to about twice it's size after the engine has been run for awhile. I checked the cap @ 15 lbs. I don't know what is making the hose swell this much. Any ideas?

Thks.:
Sam

tom

  • Hero Member
  • *****
  • Posts: 1146
    • View Profile
    • Discount Internet Services
Re: Lower Radiator Hose
« Reply #4 on: January 04, 2011, 05:23:11 PM »
Possibly some kind of flow restriction?
69 X11 Z21 L14 glide
looking for a 69 export model (KPH) speed
o

bertfam

  • Hero Member
  • *****
  • Posts: 4492
    • View Profile
Re: Lower Radiator Hose
« Reply #5 on: January 04, 2011, 05:38:46 PM »
Sam, go down to your local auto parts store and get a gates or equivilant lower hose, and see what that one does.

Ed

77thor

  • Member
  • ***
  • Posts: 329
    • View Profile
Re: Lower Radiator Hose
« Reply #6 on: January 04, 2011, 05:51:46 PM »
Also, check (or replace) the thermostat.
1969 Camaro SS, 350(NOM), M21, 12 Bolt Posi, 01B LOS Build
1977 Camaro, 350(LM1), M20, 10 Bolt Posi, Purchased New, (SOLD)

BlackoutSteve

  • Member
  • ***
  • Posts: 397
    • View Profile
Re: Lower Radiator Hose
« Reply #7 on: January 05, 2011, 09:34:45 PM »
The hose swells up to about twice it's size after the engine has been run for awhile.

I have only ever seen hoses that are well past their service life swell excessively like you describe. Especially those that have ever been exposed to oil -either internally or externally. Oil kills rubber.
Yep, grab a replacement.
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840