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Identifying Head Studs And Nuts


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#1 Moke Spider

Moke Spider

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Posted 25 August 2018 - 07:52 AM

As far as I am aware, there's been 3 types of Head Studs and Nuts used by the Factory during the Production of the Mini. This only deals with Factory Parts.

 

<Edit: Graeme C has kindly reminded me that there was a 4th type of Stud fitted by the Factory. We're just trying to dig up the correct info on it and include these in this list. Thanks Graeme >

 

I've compiled a few photographs here and some information on each type.

 

Early

 

JNNjorN.jpg

 

Looking at the tops, they are plain however the very last thread is wasted away.

 

Matching nut

 

ek4N4uW.jpg

 

These were fitted to all Engines from 1959 up to 1968, except the Cooper S.

 

Short P/N 51K256

 

Long P/N 51K255

 

Nut P/N 51K371

 

Washer (not shown above) P/N PWZ106

 

Tightening Torque (oiled) 40 ft/lb.

 

 

Cooper S

 

From 1968 to 1971, the Cooper S was fitted with up-rated Studs and Nuts

 

hWof965.jpg

 

n1XH2cm.jpg

 

The single easiest way to identify these is the centre drilling in the tops

 

Matching Nut

 

vZxWb4Q.jpg

 

On one side, there is interlinked 8's and the other there is a series of 5's stamped in to the flats

 

The Cooper S was also fitted with an additional Bolt, up near the Thermostat

 

wcnrQxl.jpg

 

UatRVgJ.jpg

 

The 300 stamped in to the head of it related to it's tightening Torque, the 300 being in pound/inches and that translates to 25 ft/lb

 

WLGFBR0.jpg

 

Short P/N 51K276

 

Long P/N 51K277

 

Nut P/N 51K371

 

Bolt P/N AEG248

 

Washer (not shown above) P/N PWZ106

 

Tightening Torque (oiled) Nuts 42 ft/lb.

                                         Bolt (done last after all the Nuts) 25 ft/lb

 

 

One that I had forgotten about!

 

zMDX99l.jpg

 

The 'Y' stamped Stud. 

 

Thanks to Graeme C, Nick and Retroman for reminding me of these.

 

At this point in time, we don't have positive information on these, but will include that as it comes to hand - Info now found and appears below

 

<EDIT: These were introduce around 1969 - 1971, not fitted to all models

 

Short P/N 51K280

 

Long P/N 51K279

 

Nut P/N NH606060  though in later years the CAM4545 was used.

 

Tightening Torque   40 ft / lb >

 

 

 

Last of the Studs

 

Introduced in 1971 - 73 and used to the end of production on all models

 

w1oLQJP.jpg

 

They have a very distinct Taper on the UNF end

 

Matching Nut

 

lwB9LrQ.jpg

 

Short P/N CAM151

 

Short, but with longer UNF end for the Coil Mounting Bracket TAM 1617

 

Long P/N CAM150

 

Nut P/N CAM4545

 

Tightening Torque (oiled) 50 ft/lb.

 

 

 

I'll also add one 'odd ball' type in here.

 

Bolt

 

These were used in Australian Production from around 1965 up to 1974

 

8e5csI8.jpg

 

wURKAvr.jpg

 

Short P/N AYA175

 

Long P/N AYA174

 

These were Single Use Only, meaning, when they come out, they should go in the bin and new ones fitted. It's clear from the Head Marking, they were only Grade 8 Tensile. I don't think replacements are available these days, however, given what they are, a Fastener Supplier could help out, they the Head may be thinner. Personally, I found these were none too good at all. I wouldn't advocate their use, except say for a period restoration.

 

Tightening Torque (oiled) 38 ft/lb.


Edited by Moke Spider, 08 September 2018 - 07:25 AM.
Insert additional info on ' Y ' Studs





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