Intermittent starting problem (warmish engine)

[Jase]

Hi,

Have been quiet on here, this is my first ever post on a forum so bear with me

I have owned my 1991 940TD since August and apart from a new battery has got through a very wet winter with no problems.

But in the last couple of weeks has been playing up a bit:

Apart from all the smoke and clattering she starts from cold okay but after driving and reaching running temp when left for a little bit (30 - 60 mins) she doesn't always start, just turns over. Often the glow plug relay sounds like it is clicking back and forth.

If anybody has any advice or information I would be very grateful.

Thanks in advance

Jason