1970 LT1 Vacuum Leak Headlight
Thread Starter
Advanced
Joined: Mar 2011
Posts: 78
Likes: 5
From: NY
1970 LT1 Vacuum Leak Headlight
Hi I have a 1970 Lt1 Right headlight assy. has a leak I pulled hose off both sides of canister one at a time and the leak stops. Also no leak when headlight are on or up , only leaks when down. Any advice. Thank you for any help. Tony B.
Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi ls5,
I believe the way to test the canister takes 2 steps.
First hook the vacuum gauge to GREEN hose side of the actuator, (rod/clevis side), and block the other nipple. It should hold vacuum. If it doesn't the diaphragm in the canister is leaking. (new canister needed)
Then hook the gauge to the RED hose side and block the other nipple. It should hold pressure. If it doesn't hold vacuum the seal on the clevis rod is leaking and needs to be replaced.
Good Luck!
Regards,
Alan
I believe the way to test the canister takes 2 steps.
First hook the vacuum gauge to GREEN hose side of the actuator, (rod/clevis side), and block the other nipple. It should hold vacuum. If it doesn't the diaphragm in the canister is leaking. (new canister needed)
Then hook the gauge to the RED hose side and block the other nipple. It should hold pressure. If it doesn't hold vacuum the seal on the clevis rod is leaking and needs to be replaced.
Good Luck!
Regards,
Alan
