Triumph 2.5 straight six

[Leecapri83]

Thanks to everyone who helped in the previous thread for this car. After retiming and tuning the carbs at different revs it is running a lot better - the long term solution is obviously to have the carbs rebuilt, this will take some saving up but at least the car is usable for the summer.

Second problem there is a heavy vibration coming through the steering wheel at all speeds but particularly bad when accelerating and still present when turning the wheel or going in a straight line.

So far we have done front wheel bearings, front ball joints, steering arms, gearbox mount and had the wheels balanced but no improvement.

Any suggestion greatly appreciated.

It's and auto gearbox also.

 

[daedalusminos]

Have you tried swapping front/rear tyres?

Also check propshaft joints for wear.

 

[Paul.]

I had that trouble with my PI, in the end I replaced all the propshaft and driveshaft joints, that cured it but I never did determine which one was the offender

 

[colnerov]

Hi, Yes, I second prop shaft joints. They probably won't be worn but partially seized because the gearbox and diff don't move about much relative to each other the joints tend to 'freeze'. Then drive shafts after that.

Colin

 

[Melvyn Best]

Prop shaft problems were fairly common on Triumph 2000s and 2.5s

 

[Leecapri83]

Thanks fort the replies, prop shaft ordered.
Does anyone know if they turn up balanced or are somehow balanced on the car?

 

[blackolive (Ste)]

how old are they tyres ? there may be flat spots

 

[merryman]

Thanks fort the replies, prop shaft ordered.
Does anyone know if they turn up balanced or are somehow balanced on the car?

They are balanced at the factory, but I would have expected the joints to be replaceable in that age of car, one of my least favourite jobs it is true, but a sight cheaper than a new prop shaft.

 

[dobbslc]

Had that on a Ford Cougar bad rumble, it was a knackered rear tyre.

 

[Kent]

If its been stood on the existing tyres then that alone is most likely the issue. Tyres dont like sitting still with any load on them.
2500 tc was one of the first cars i drove 4 speed with an overdrive switch - looked nice until you got a look at the cills (rot box)