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Solex B30 PSE1 Cover Screw Specs


Colin
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Hi Team ! (sorry) 😑

Working back up the line and following my recent fuel system debacle, I note that at some point (did I drop the originals somewhere??!), two of the flat headed screws seem to have turned into thin wing nutted fixings! 

Perfectly adequate, but I'm in a position to replace them properly now and wondered what their spec is, screws and nuts being v complicated.

These days, Mthis and Mthat sizes are the norm, and I think an M5 might be close to the size but I think the thread may be not quite right!!

Any ideas?? đŸ€”

Best, 

C

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Well, they shouldn't be metric, if original UK carbs from the pre-decimal days. One USA site I've just checked claims M4 is correct, but they may have been metric from the word go; I know Solex carbs for other European cars such as VW all used metric.

If no-one has come up with the correct size I'll dig one out and measure over the next few days; in the meantime replacement screws are available over the water, and bound to be here too:

https://www.carburetion.com/screws.asp

http://www.gowerlee.dircon.co.uk/PSEItype.html

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Thanks chaps.

I hold a small stock of M size screws. 

M4 slips through, M6 is too fat.

I would imagine if I got hold of M5's, the threads would not match.

The 3/16 option sounds like one I should pursue via the 'net.

Cheers and best,

Colin W

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in uk metric wasnt invented in the auto industry and SU being an older design could well be older than unf 

i got a few from Canley last year   checking some old ones   they are  pitch 24  dia 0.1825  which looks like whitworth  !!!  or    3/16"UNF apart from the dia ought to be 0.1875"

both similar apart from thread angles 

senior moment syndrome    this is for a B30 solex    and im waffling SU  ...Grrrr   where the pills  ????

 

Mick dolphin lists  503273 at 10P  no site seem to x ref to thread sizes 

Pete

 

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Peter,

That's also good, specific info., too.

Many thanks,

Best,

C.

Just for info folks, the missing screws I replaced long ago with flat head screws and wing nuts on thr bottom. 

They tighten up nicely and I have never had a problem with the carb as a result! But original, they certainly are not!!

The carb has a casting date stamp of 1963 on my 1970 Herald! 😁

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Peter,

That's also good, specific info., too.

Many thanks,

Best,

C.

Just for info folks, the missing screws I replaced long ago with flat head screws and wing nuts on thr bottom. 

They tighten up nicely and I have never had a problem with the carb as a result! But original, they certainly are not!!

The carb has a casting date stamp of 1963 on my 1970 Herald! 

Pimp my Vit :- Thanks! Those outer two screws in the lower left set deffo look the part. Not sure about the other two! 😊

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mick is  goldmine of useful new old stock  the shop is old school  so its e mail phone etc but you can be amazed at just what he has listed

you do need a triumph part number to find anything , easy as most other mainstream retailers use triumph part numbers if you dont have a parts list

get one on your wish list from club shop 

Pete

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