Just be grateful they didn't throw any wentworth in there while they were at it.

 

i think a couple dozen security torx heads, of various sizes, would have been great for panels.

 

Or even Whitworth, for that matter

 

For information when next doing a quiz!!!
There is NO Wentworth--its Whitworth!

Found on lots of Brit iron especially pre WW2 and I bet to anyone's naked eye you wouldn't be able to tell the difference! Only the hex head would be the giveway until you get to a bolt which is 5/8th of an inch in diameter or more!

Reason?
The Whitworth thread has a pitch of 55 degrees but has the common course 18 tpi whereas its Yankee competitor/cousin in UNC has 60 degrees!
The UNC thread has flattened crest whereas the the Whitworth has rounded crests on the thread.

So you could put "whitty" and UNC without a problem in the timing case, heads etc on the LR engine and it would work.
"Frownsville" perhaps!
Its larger hex head might be a problem finding a socket to fit the hex head; you would need a set of BSF/Whitworth size sockets and spanners (wrenches)to tighten it up.
If you were to mix 5/8" and larger diameter bolts/nuts with UNC the threaded pitch would start to progressively bind up and gall the threads as you go larger.

Just for info these thread standards were introduced by a Joseph Whitworth in 1841 for the Royal Navy who of course in those days had the biggest fleet than the rest of the world had collectively!
British Railways quickly followed suit and used both the course and finer BSF fastening plus the cycle industry which used the fine cycle thread making up the three thread types standards devised by our Mr Whitworth.
Whitworth today is more common than you think!--its found in B.S.P pipe fittings at your local hardware store.

Now as to the comment about mix and match of bolting for different applications to confuse the hell out of you, the best can be found on Morris and Austin cars of the 1920's and 1930's!
The engine being basically a French design the threads were metric, but Brits being Brits made the bolt head in Whitworth sizes!

So if any of you decide to re-hab some old Brit Iron bear that piece of useless information on *** packet behind your ear!
Saludos from Tuercas Viejas

 

i will have to adjust my spell check.

but silly me i like to use quick reply
and not make every answer 5 paragraphs long story of the history of Joseph Whitworth just so that i have something to write about.

How about latent heat could you do use o prospectus on latent heat next, I bet you could waste 8 or 9 paragraphs on that.

 

drowssap
Well I suppose I could write a dissertation on that subject but it would probably be over your head; however I don't suppose you will now mix up a place somewhat famous for a Golf trophy and an individual famous for devising a complete bolting system, AND the micrometer in 1851
Amistades y Saludos
T/V

 

you made my point

 

What size are these?

 

So 3/8th inch socket and 9/16th socket?

 

No, the bolt is 3/8" diameter, and the head on the 3/8 bolt is 9/16, which in this case is industry standard (but of course land rover doesn't always play nice).

Bolt Depot - US Bolt Head, Wrench Size, and Diameter Table