Hi everyone.

 

I've just changed my gearbox rear mount (front part of prop & centre bearing replaced already because of vibration above 50 mph) and I've STILL got hellish vibration at only 30 mph+:eek: . My theory is that maybe because I've only replaced half of the prop (rear section okay) that there may now be an imbalance ie. the two halves are matched to one another during manufacture. Does anyone know if this is true or not and if anyone can balance the two together as this is really doing my head in now.

 

Many Thanks

 

Shaunmac

;) Well I finally stopped it vibrating like a tw*t using a method described on a Triumph maintenance web site. I did it as follows:-

 

1. Jack the arse of the car in the air, remove its rear wheels to avoid vibration from tyres etc. Fire her up and put her in drive and get someone to hold it at the revs where it resonates like hell. Then climb underneath and using a sharp object, progressively move it nearer and nearer (very slowly) until it makes contact with the prop (do it near the Centre bearing end and away from any existing weights). If you push too hard, you'll draw a nice line all the way around the prop!

 

2. Stop the engine and inspect the prop, you should find a scratch about 3cm long on the side of the prop which has "run-out" thus causing the vibration. The weight needs to go at the opposite end of the prop to counter act the imbalance. I used a jubilee clip as the counter balance weight but I had to sandwich a small piece of steel (from the old Centre Bearing as it was the right shape!) under the jubilee clip. It's important to keep trying different weights until you get the best results though and it p**ses neighbours off as you need to do it without the zorst fitted !! Hope this helps anyone who's got the same shi*ty problem.

 

Shaunmac.

Result :D

Bloody hell - dynamic prop balancing the hard (and dangerous) way ! Well done