Problems with my Bush
Posted: Mon Oct 11, 2021 10:49 am
This post is a heads-up for anyone who like me has had a continuing problem with variable tick over on a 356, the car is a B T6 and since putting it back on the road after restoration ( two years now) .
Over that time I have tried to find a cure for the problem, setup the carbs, replace the springs on the carbs, grease all cups and bearings including pedals etc but to no real improvement, so after having to put the car on stands for another small job I thought I would look underneath at the throttle rods and grease the cups. After disconnecting the cups off the accelerator pivot I found that the pivot was sloppy on the shaft but because the pivot is held in place by a large washer it is impossible to see what was cause, so off came the washer and I found no bearing on the shaft which is 10mm wide with the pivot barrel being 20mm , hence the movement. When I took off the pivot there was some sort of red residue inside the barrel but nothing else.
Looking at the official parts catalogue there is no bushing show for the car but by asking around I found out that the original plastic bushes had a habit of disintegrating over time and is not easy to spot because of the covering washer. However by looking on well known suppler websites there are nylon replacement bushes available, so I got hold off a couple to fit inside the pivot.
When trying to find the bushes they were not a straight forward fit as the bushes were slightly larger than the barrel, so I had to heat the pivot with a hair drier to expand the hole, this got the bushes inside the pivot but the pivot was too tight to go onto the shaft. The only way round this was to reem out the centre hole of the bushes with a 10mm drill bit, after this the pivot fitted easily onto the shaft and rotates without any sloppiness, so i fitted everything back and success, now the tick over is far more consistent, returning back to the rpm I set it to without any hesitation.
I hope this post helps, as with lots of these niggling little problems there is probably a solution know by someone, if we all posted our own solution that fixed them we all benefit.
Over that time I have tried to find a cure for the problem, setup the carbs, replace the springs on the carbs, grease all cups and bearings including pedals etc but to no real improvement, so after having to put the car on stands for another small job I thought I would look underneath at the throttle rods and grease the cups. After disconnecting the cups off the accelerator pivot I found that the pivot was sloppy on the shaft but because the pivot is held in place by a large washer it is impossible to see what was cause, so off came the washer and I found no bearing on the shaft which is 10mm wide with the pivot barrel being 20mm , hence the movement. When I took off the pivot there was some sort of red residue inside the barrel but nothing else.
Looking at the official parts catalogue there is no bushing show for the car but by asking around I found out that the original plastic bushes had a habit of disintegrating over time and is not easy to spot because of the covering washer. However by looking on well known suppler websites there are nylon replacement bushes available, so I got hold off a couple to fit inside the pivot.
When trying to find the bushes they were not a straight forward fit as the bushes were slightly larger than the barrel, so I had to heat the pivot with a hair drier to expand the hole, this got the bushes inside the pivot but the pivot was too tight to go onto the shaft. The only way round this was to reem out the centre hole of the bushes with a 10mm drill bit, after this the pivot fitted easily onto the shaft and rotates without any sloppiness, so i fitted everything back and success, now the tick over is far more consistent, returning back to the rpm I set it to without any hesitation.
I hope this post helps, as with lots of these niggling little problems there is probably a solution know by someone, if we all posted our own solution that fixed them we all benefit.