PS The fact that half of the 25l drum has been used would seem to fit with the 13.3l capacity of the fluid flywheel - can't think what else it could have been used for...

My bus number (if any): RML2302

Hello Brian,

I have just had a quick trawl through the search engine of Alan's forum which reveals that you had a problem in 2010 upon which there was discussion about your flywheel. Please have a read through this again particularly Colin's replies on the subject.

There was some doubt about which flywheel you had fitted. There were several different ones fitted. A very small batch had a lock-up clutch incorporated, about which there has never been any discussion. Some Cummins C series engines had the standard AEC flywheel, but IIRC many had this replaced with a Voith fluid coupling.

The Voith coupling is easy to identify since it has numerous prominent radial fins and only one very small orifice for filling with oil. The only mention about oil for it is that it requires an EXACT quantity of oil and that it MUST NOT USE the same oil as the AEC flywheel. There has never been any mention of the grade of oil required.

You would be best advised to contact Voith UK firstly and if unsuccessful to try Cummins UK Help Line. You will need your engine number which is on a plate on the top of the timing case, it will start 211***** One of these should be able to identify the exact model of coupling fitted and the oil specified. The Voith to which I have regular access does not have any manufacturer's details on it, nor has it ever leaked.

Hi Roy Thank you - I knew you would be able to give me some good advice! You're quite right about the comments on Alan's forum - because the problem was actually in the gearbox (which was then rebuilt at Ossett) I didn't pursue the flywheel points any further. It does rather sound as if I have the Voith flywheel because it has lots of fins and perhaps therefore TD/Q was an appropriate fluid. I'll investigate further and of course follow your advice. Thank you again!

My bus number (if any): RML2302

Whoops - it's actually called TQ-D (although I'm not sure if it's produced anymore) As suggested by Roy, I've emailed Voith and will let everyone know the result.

My bus number (if any): RML2302