G'day fellers,
as always I'm late on the scene but this one's got me intrigued.
My old 4.2d had over 400K when I sold it and there was no sign whatsoever that glow plugs or pump needed any attention at all.
The new(er) '08 zd30 has about 160K and so far the same applies.
If I assume that on starting, the dashboard glow plug light indicates how long the plugs are heating, then they're on for no longer than about 5 sec.maybe a tad more it seems on a cold day. Is that correct or do they continue to heat after the light goes out?... Don't reckon they would 'cause without looking at the circuitry, (Jeez I'm a lazy sod), I'd assume the one line covers both heating and dash light.

Anyway, as my dear departed old Daddy, when I was a lad about 60 years ago would say as he leant over the bonnet of our 1923 Dodge tourer, "if it ain't rooted, why would you?"
Had a way with words, the old fellow.

Got me nervously twitching though. Reckon I'll check for cracks around. Thanks for that Muddy Lizzard .
Regards
Col
p.s. I'd better have a look at guru Yendor's thread.