Got final refusal to fix to my broken exhaust bypass valves under warranty. Jag Bristol wanted £2600 to replace… So decided to see if I could at least stop the rattle.
Pulling the rear silencer off my v6s is easier than thought. Undid the two clamps then gave a wiggle by pulling up and down on tail pipes. Trick is to lift up behind the rear balance, gives room to pull sleeves apart. Not too heavy just needed a pair of ramps to get high enough.
Valves are actuated with a vacuum cylinder and cam . It’s the shaft on the butterfly valve that breaks.
My valves were always stuck shut I.e quiet so I did try wiggling them free and I think it’s doing this wrong that finally fatigued the shaft.
In hindsight should have removed the exhaust and pushed the butterflies so didn’t put so much torque on the thin shaft.
I managed to get the broken bits apart by removing the circlip from the back of the pivot.
Leaving me with a wiggly butterfly valve. Decided the best cheap solution was to try and fix the flap in a single position.
Found that the hole for the shaft was 5mm so decided to tap with m6 thread.
Then used a screw with the last few threads removed and a lock nut.
Then twiddled the valves til full open and tightened up. Worked a treat
Refitted and took out for a drive. Rattle gone and Holey Moley was louder. Massive pops and rasps. Hilarious
So much. I bottled it, took off and dialed back to 1/4 open
Obviously a one way trip but if all else has failed then seems to be a great salvage.
Pulling the rear silencer off my v6s is easier than thought. Undid the two clamps then gave a wiggle by pulling up and down on tail pipes. Trick is to lift up behind the rear balance, gives room to pull sleeves apart. Not too heavy just needed a pair of ramps to get high enough.
Valves are actuated with a vacuum cylinder and cam . It’s the shaft on the butterfly valve that breaks.
My valves were always stuck shut I.e quiet so I did try wiggling them free and I think it’s doing this wrong that finally fatigued the shaft.
In hindsight should have removed the exhaust and pushed the butterflies so didn’t put so much torque on the thin shaft.
I managed to get the broken bits apart by removing the circlip from the back of the pivot.
Leaving me with a wiggly butterfly valve. Decided the best cheap solution was to try and fix the flap in a single position.
Found that the hole for the shaft was 5mm so decided to tap with m6 thread.
Then used a screw with the last few threads removed and a lock nut.
Then twiddled the valves til full open and tightened up. Worked a treat
Refitted and took out for a drive. Rattle gone and Holey Moley was louder. Massive pops and rasps. Hilarious
So much. I bottled it, took off and dialed back to 1/4 open
Obviously a one way trip but if all else has failed then seems to be a great salvage.
