The oil separator would be under those two screws on the underside of the rocker cover. Depending on model it will be a bit of foam or a bit of foam and wire mesh. They will be inside the squarish sort of bit sticking up on the outside of the rocker box that the breather pipe comes out of. Check the...

Drum, is there supposed to be an Oil Separator Foam & Mesh Filter inside the rocker box on this engine?
Pop the rocker box off and have a look see if the oil separator is OK ?

What is the oil level like?
(I had a Lister engine that used to have the oil level go up whilst running as there was a diesel leak into the sump)

That's a real result! ...(I'm glad you cleaned the edges of that proto-board up. They were making my teeth itch!) Yeah, it wasn't going to stay all gnarly. It isn't the tidiest thing ever but it should function well enough. Unfortunately the gauge has become a bit sticky in the middle of its travel...

That's a real result!

...(I'm glad you cleaned the edges of that proto-board up.
They were making my teeth itch!)

What is the median age in Needham Market?
I'm guessing somewhat older than the National median age...

https://www.ebay.co.uk/itm/Diesel-Engin ... Sw7rVc7mdZ

Any use?
(no idea what size your engine's glow plugs are)

^Have you got a compression tester suitable for that engine?
If so do a dry and wet test.

https://i.ebayimg.com/images/g/WvIAAOSwJw5fDZCn/s-l1600.jpg THIS IS A GENUINE BARN FIND https://www.ebay.co.uk/itm/1958-MORRIS-OXFORD-1500/174348799554?hash=item2897ff8e42:g:ZgkAAOSwznNfDZBt It feels like that has been for sale on the bay ever since it was a new car :roll: In reality it is about fi...

https://i.ebayimg.com/images/g/K~MAAOSwrz5fEFQM/s-l1600.jpg https://www.ebay.co.uk/itm/Rare-1931-Vintage-Guildford-Caravan-Art-Deco/164293026282?hash=item2640a0a1ea:g:K~MAAOSwrz5fEFQM And from the same Seller (not me) https://i.ebayimg.com/images/g/ib4AAOSwKDRfEA9y/s-l1600.jpg https://www.ebay.co.u...