DG Engine differences?

[sump]

Can any one tell me what is fitted to the threaded hole in the picture please?

[maxstu]

A/C mounting point for compressor?

Two mount points...

[sump]

Ah, If that's all it is then that's fine. It's just that my earlier version doesn't have that hole just the one on the left of your photo.

[freckvan1]

Aha, noticed you’re fitting new exhaust as I am on mine .
On mine studs all round apart from bolts on manifold nearest Water Pump .
Out of curiosity are you using studs on that manifold, or bolts ?
Atb,
Chris

[sump]

I'm the opposite way around then! Studs on RHS front manifold and bolts on the rest. That's how it was before and seemed to work ok.

[maxstu]

Aha, noticed you’re fitting new exhaust as I am on mine .
On mine studs all round apart from bolts on manifold nearest Water Pump .
Out of curiosity are you using studs on that manifold, or bolts ?
Atb,
Chris

I haven't decided yet. Probably studs and nuts all around for manifold pipes. Then using bolts and nuts for pipework connector flanges.
Early exhaust system had a mixture studs and bolts l recall.

[freckvan1]

Yup, mine’s early system which if I was younger would have changed to more robust later one .
At coming to mid seventies longevity of the exhaust isn’t an issue now
Regarding the mixture of studs/bolts, I get the impression when built was all studs . The one nearest Water Pump looks tight with studs , but I’ll give it a go tomorrow .
Hope yours both go ok .
Chris

[maxstu]

I'm pretty certain the early system used some bolts, probably because of the tight turns of the manifold pipes coming from cylinders 1 and 3?

[sump]

All bolted up now and running