i experience a rattling/ knocking noise every now and again when i start the engine, especially when cold. the car has done almost 60k (focus mk1 54 reg 1.8 tdci 115bps). i have been advised by my mechanic that this is due to DMF failure.

i had it replaced along with the clutch kit , clutch slave cylinder, master slave cylinder, had plugs changed and a battery, and guess what the car still not recovered with the knocking noise, although sound isn't so disturbing any more.

Now i am being told that it is to do with the gearbox main shaft/ bolt which connects with clutch and that it is a common fault on ford diesels, especially mondeo and transit, although i have a focus. i was told that nothing can be done about this (probably without major repair that would be uneconomical) and should be driving safely.

i am concerned that it will get worse with time and i will be hit with another massive bill.

i would appreciate any tips, advice on what should i do about it.

Many thanks for all your input.