Thread: Defender Imperial or Metric?

What year? Deafeners were always a grab bag of whatever happened to be lying around on the floor. Flange headed bolts with 8mm shanks were often made with 10mm heads but need a very well fitting socket or spanner to loosen. 6 point 1/4" drive sockets are the go here. Filler plugs were 1/2" BSP so should fit a 1/2" spanner I suppose.

Originally Posted by bee utey

What year? Deafeners were always a grab bag of whatever happened to be lying around on the floor. Flange headed bolts with 8mm shanks were often made with 10mm heads but need a very well fitting socket or spanner to loosen. 6 point 1/4" drive sockets are the go here. Filler plugs were 1/2" BSP so should fit a 1/2" spanner I suppose.

1995 x 130

Originally Posted by Kidbeen

1995 x 130

Those thermostat housing bolts are definitely 10mm head M8 bolts. I'd be looking for a 6 point tool to undo them. Land Rover only went metric when a particular assembly was updated. The Puma 90 I worked on last month still had imperial tailshaft nuts and bolts as they were never updated.

its a landrover, as a landrover mechanic allow me to give you a hint.

Metric, (Fine normal and Coarse threads)
Imperial both UN and SAE (in Fine and coarse)
BSP
BSPT,
BSC (copper)
BSC (conduit),
BSE
Witworth.

any, on some models all, can be found on one sub assembly of the vehicle. And thats before any monkey goes and messes with it.

and then theres the Screw threads and machine thread screws
I Generally refer to landrover fittings as

BSR

British Special, Random. OR British, Something Random.

Originally Posted by Blknight.aus

its a landrover, as a landrover mechanic allow me to give you a hint.

Metric, (Fine normal and Coarse threads)
Imperial both UN and SAE (in Fine and coarse)
BSP
BSPT,
BSC (copper)
BSC (conduit),
BSE
Witworth.

any, on some models all, can be found on one sub assembly of the vehicle. And thats before any monkey goes and messes with it.

and then theres the Screw threads and machine thread screws
I Generally refer to landrover fittings as

BSR

British Special, Random. OR British, Something Random.

Nice try, Dave. The Unified threads are NC & NF. American threads and the yanks rarely use the U as they didn't unify with anyone. Brits and Canadians unified with them. There are also NEF and NS in common use. SAE is not a thread system but a standard issued by the SAE for automotive fasteners. BSC is British Standard Cycle thread used on bicycles and motor cycles and obsolete. There is a coarse series that never received a British Standard and is known as CEI for Cycle Engineers Institute. Declared obsolete in 1950. British Standard Conduit is obsolete and almost unused nowadays except for repairing old work. The taps and dies carry the legend BSCon. BSB is British Standard Brass, a constant pitch series. All are 26 tpi. I have never heard of a BSE system. Perhaps you mean BESA from British Electrical Standards Association. These are switchgear threads and well and truly obsolete. I have not seen one for decades. Do later model Land Rovers still use any BSF?

Originally Posted by bee utey

Those thermostat housing bolts are definitely 10mm head M8 bolts. I'd be looking for a 6 point tool to undo them. Land Rover only went metric when a particular assembly was updated. The Puma 90 I worked on last month still had imperial tailshaft nuts and bolts as they were never updated.

The bolt heads appeared to be rather soft. Is that due to the effect on the steel of heating and cooling all the time? I have been unable to get the bottom bolt out. Can’t hammer a 3/8th socket on due to the confined space as the air con compressor is in the way.

Originally Posted by Kidbeen

The bolt heads appeared to be rather soft. Is that due to the effect on the steel of heating and cooling all the time? I have been unable to get the bottom bolt out. Can’t hammer a 3/8th socket on due to the confined space as the air con compressor is in the way.

Four bolts out and swing the compressor to the side. The bolt is most likely tight from a little rust. Steel bolts in alloy are easiest to undo when the engine is as warm as possible.

Bee utey are you referring to the four horizontal bolts?