| |
Click on image for the lowdown. 
====
| | |
2 members (DHedrick, WarEagle1),
103
guests, and
3
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,087 Posts1,056,375 Members48,442 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#30559 03/11/2005 11:31 PM | Joined: Aug 2004 Posts: 196 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 196 | whats it do if mine is froze open and the spring is gone can i leave it that way when you run duals you dont have one dose it give it back pressure or whats it for | | |
#30560 03/12/2005 12:30 AM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | If its in the open possition like you say & you are not in a real cold climate you can leave it alone. If you want to free it up spray it with penatrating oil & tap it back & forth with a hammer. 
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#30561 03/12/2005 5:23 AM | Joined: Feb 2004 Posts: 29,826 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,826 | It's called a "heat riser", and it's intended to warm up the intake by routing exhaust gas under the intake during cold starting. If it wasn't necessary, why did GM go to the trouble and expense to install it? I'd suggest getting it working freely, and replacing the spring in the process if you can find one. The spring is supposed to hold the valve closed when the engine is cold, and the weight opens the valve as the manifold heats up.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | |
#30562 03/12/2005 6:30 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Whatever you do, don't grab the shaft with visegrips and twist it. Best way I have found to free it up is to remove the manifold. Start with PBblaster or Kroil and a small hammer. A torch helps, heat the manifold, not the shaft. Sometimes I've only been able to get the shaft to move in and out, but not rotate, which requires drilling out the rivets that hold the flapper. Also, a lot of times someone has tried turning the counterweight with pliers, and has sheared off the pin through it.
Fred
52 3600
69 C-10
| | |
|
|
| |
