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Vacuum tanks?
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Vacuum tanks?
Do you have to have a vacuum reservoir tank? I find it interesting that the usual supply houses do not sell them. Al least not for a 68. Does anyone have a picture of one?
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
I do not have one on my '69. I find that I can remember to turn off the headlights prior to turning off the motor. Wiper door is long gone.
It is a cube shaped canister,approx 1 cubic foot if I remember,that mounts on rear of the driver side fender well.
Sorry,no pics.
It is a cube shaped canister,approx 1 cubic foot if I remember,that mounts on rear of the driver side fender well.
Sorry,no pics.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
I do not have one on my '69. I find that I can remember to turn off the headlights prior to turning off the motor. Wiper door is long gone.
It is a cube shaped canister,approx 1 cubic foot if I remember,that mounts on rear of the driver side fender well.
Sorry,no pics.
It is a cube shaped canister,approx 1 cubic foot if I remember,that mounts on rear of the driver side fender well.
Sorry,no pics.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The vacuum reservoir is used to maintain vacuum level...regardless of throttle being used. If you didn't have one and you went to WOT, your vacuum level would drop to nothing and the wiper door would want to close.
Is it absolutely necessary to have one? No. Is it a good idea, if you want a well-working system? Yes.
You can use about any container that will hold 20"Hg vacuum (without imploding). It just needs to be sealed, have about 1/2 cubic foot of volume, and have 3 nipple connections for vacuum hoses.
Is it absolutely necessary to have one? No. Is it a good idea, if you want a well-working system? Yes.
You can use about any container that will hold 20"Hg vacuum (without imploding). It just needs to be sealed, have about 1/2 cubic foot of volume, and have 3 nipple connections for vacuum hoses.
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Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
The vacuum reservoir is used to maintain vacuum level...regardless of throttle being used. If you didn't have one and you went to WOT, your vacuum level would drop to nothing and the wiper door would want to close.
Is it absolutely necessary to have one? No. Is it a good idea, if you want a well-working system? Yes.
You can use about any container that will hold 20"Hg vacuum (without imploding). It just needs to be sealed, have about 1/2 cubic foot of volume, and have 3 nipple connections for vacuum hoses.
Is it absolutely necessary to have one? No. Is it a good idea, if you want a well-working system? Yes.
You can use about any container that will hold 20"Hg vacuum (without imploding). It just needs to be sealed, have about 1/2 cubic foot of volume, and have 3 nipple connections for vacuum hoses.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
All C3s have/had a vacuum reservoir. Tanks for 68-72; front tubular cross member after that; coffee cans under the nose for later years.
The reservoirs allow cycling the headlights and wiper doors a couple of times with the engine off.
The reservoirs allow cycling the headlights and wiper doors a couple of times with the engine off.
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
Vacuum tanks supply energy to open the lights, heater controls PB booster, carburetion, etc.
They are a PITA to remove and intall so make sure the replacement is good before spending the time. The foot brackets tend to flex with the tank and must be persuaded for the holes to align.
They are a PITA to remove and intall so make sure the replacement is good before spending the time. The foot brackets tend to flex with the tank and must be persuaded for the holes to align.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Ohhh, thats what that thick vacuum line looking thing is on one of the vacuum system schematics I have been studying. It is the tubular cross member.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Vacuum tanks supply energy to open the lights, heater controls PB booster, carburetion, etc.
They are a PITA to remove and intall so make sure the replacement is good before spending the time. The foot brackets tend to flex with the tank and must be persuaded for the holes to align.
They are a PITA to remove and intall so make sure the replacement is good before spending the time. The foot brackets tend to flex with the tank and must be persuaded for the holes to align.
Team Owner
Joined: Sep 2006
Posts: 31,283
Likes: 4,374
From: Westminster Maryland
Hi AW,
The tank mounts to the left-side inner fender.
You can see the top of the tank in this picture.
There are three 'feet'that are part of the tank, each with 2 welded nuts for bolts that pass through the fiberglass
You can't get it in or out with out moving the master cylinder out of the way.
Regards,
Alan
The tank mounts to the left-side inner fender.
You can see the top of the tank in this picture.
There are three 'feet'that are part of the tank, each with 2 welded nuts for bolts that pass through the fiberglass
You can't get it in or out with out moving the master cylinder out of the way.
Regards,
Alan
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Since I have never had a wiper door on my car I'm not really familiar with it's operation. All I know is that without a reserve canister I have no problems with my headlights. As long as I remember to turn out the lights before I stop the engine. And it did free up a bit of room for the placement of the new fuse box. I have it mounted on the firewall to the rear of the driver side inner fender.
Thread Starter
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Hi AW,
The tank mounts to the left-side inner fender.
You can see the top of the tank in this picture.
There are three 'feet'that are part of the tank, each with 2 welded nuts for bolts that pass through the fiberglass
You can't get it in or out with out moving the master cylinder out of the way.
Regards,
Alan
The tank mounts to the left-side inner fender.
You can see the top of the tank in this picture.
There are three 'feet'that are part of the tank, each with 2 welded nuts for bolts that pass through the fiberglass
You can't get it in or out with out moving the master cylinder out of the way.
Regards,
Alan
Instructor
Joined: Dec 2009
Posts: 107
Likes: 0
Just as a side note. When I did the body off restoration on my '69 I decided to sand blast the vac. reservoir for repainting. I found cracks at the bottom of the stiffener depressions on both sides of the can.
I'm certain these cracks were created by over 40 years of vacuum cycling in the reservoir and the cause of vac leaks. Look for these cracks when refurbing your vac reservoir.
I'm certain these cracks were created by over 40 years of vacuum cycling in the reservoir and the cause of vac leaks. Look for these cracks when refurbing your vac reservoir.