77 headlight question
Thread Starter
Intermediate
Joined: Jun 2007
Posts: 33
Likes: 0
77 headlight question
What is the purpose of the vaccum tank inside the front bumper? Can you override it and connect a vacuum hose directly from the vacuum check valve to the two headlight vacuum relays? Is this a viable solution to a leaking vacuum tank?
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
No, in fact that tank is probably what's keeping your lights and brakes working as they do with that leak.
It's not the easy way out it appears to be because getting that tank is a process much harder than just finding a leak in the vac system.
I would advise you focus on the leak, or switch to headlights and braking systems that don't use vacuum. You'll have a lot less to worry about and won't have to wrestle the tank out of the nose.
Thread Starter
Intermediate
Joined: Jun 2007
Posts: 33
Likes: 0
[QUOTE=Durango_boy;1560912271]No, in fact that tank is probably what's keeping your lights and brakes working as they do with that leak.
QUOTE]
In what way do the brakes depend on the vacuum system? This is my first vette and I appologize for the basic questions.
QUOTE]
In what way do the brakes depend on the vacuum system? This is my first vette and I appologize for the basic questions.
Burning Brakes
Joined: Sep 2006
Posts: 1,071
Likes: 86
From: Rotonda FL
The vacuum tank in a 77 is a part of frontal crash system and is made of very heavy tubing. It is unlikely that this has rusted through anf is the source of your vacuum leak. C3's have a vauuum resevoir to allow you to raise or lower your headlights after turning your engine off.
To answer your question,
1)yes you can replumb the vacuum system to bypass the resevoir, but you will always have to have a running engine to raise or lower your headlights.
2) before you do this, trace your rntire vacuum system looking for loose or deteriorated hoses or parts. It is far more likely that your vacuum leak is here father than in the heavy walled tubing of the 77's vacuum resevoir
Your power brakes are also vacuum assisted, but they are not supplied from the resevoir. They have a direct connection to the intake manifold and have a check valve where the hose enteres the metal can to retain the vacuum.
To answer your question,
1)yes you can replumb the vacuum system to bypass the resevoir, but you will always have to have a running engine to raise or lower your headlights.
2) before you do this, trace your rntire vacuum system looking for loose or deteriorated hoses or parts. It is far more likely that your vacuum leak is here father than in the heavy walled tubing of the 77's vacuum resevoir
Your power brakes are also vacuum assisted, but they are not supplied from the resevoir. They have a direct connection to the intake manifold and have a check valve where the hose enteres the metal can to retain the vacuum.
Racer
Joined: Jan 2007
Posts: 325
Likes: 0
From: Ocala FL
However, if your vacuum tank is leaking from a rust through, you need to get your frame inspected by a vette professional. The tank is pretty heavy duty and isn't prone to collecting moisture and debris causing rust out. The rest of the frame should be in much worse condition than the tank.
Thread Starter
Intermediate
Joined: Jun 2007
Posts: 33
Likes: 0
I'dbe surprised if the vacuum tank is leaking on a 77. Unless you've tested the vacuum tank with the hoses removed and the fittings capped to be sure it's leaking, I'd suspect the relays and actuators as like most likely cause(S).
However, if your vacuum tank is leaking from a rust through, you need to get your frame inspected by a vette professional. The tank is pretty heavy duty and isn't prone to collecting moisture and debris causing rust out. The rest of the frame should be in much worse condition than the tank.
However, if your vacuum tank is leaking from a rust through, you need to get your frame inspected by a vette professional. The tank is pretty heavy duty and isn't prone to collecting moisture and debris causing rust out. The rest of the frame should be in much worse condition than the tank.
The frame appears to be painted with some type of protective frame paint. There are no spots of rust. I will definantly have it reviewed professionally, however.
