BMC 1.8 manifold stud/nut thread size?

[V_King]

Hello,

I stripped my engine last February before the boat refit and now it is time to start putting everything back together.

But I can not find one of the inlet/exhaust manifold nuts. As the others are well worn anyway, I would like to change all of them. Does anyone know the thread size for them? It is probably the imperial thread, as the pitch looks very fine. The boat is an hour drive away, so like to avoid necessary trip.

Thanks, 

[RLWP]

They're standard BMC studs, most MG specialists have them. For instance: http://www.leacyclassics.com/fhs2513.html

If you don't already have them, get some brass nuts too. I like the long after-market ones as they stop the thread on the stud rusting

Richard

[Flyboy]

7 hours ago, V_King said:

Hello,

I stripped my engine last February before the boat refit and now it is time to start putting everything back together.

But I can not find one of the inlet/exhaust manifold nuts. As the others are well worn anyway, I would like to change all of them. Does anyone know the thread size for them? It is probably the imperial thread, as the pitch looks very fine. The boat is an hour drive away, so like to avoid necessary trip.

Thanks, 

They nuts have UNF threads. The studs are UNC threads where they screw in the block.

Edited September 21, 2017 by Flyboy

[X Alan W]

As Rchard says use the AM brass long jobbies save tons of heart ache at a later date

[RLWP]

I'll unscrew one tomorrow and check

Richard

[V_King]

Thanks all for the replies. From the memory the nuts were looking like fine thread M8. So I think it is save to assume the nuts are 5/16" UNF. I only need the nuts, as the studs were ok.  

[RLWP]

Yes, 5/16 UNF is right

Nuts here:http://www.ebay.co.uk/itm/QTY-10-5-16-UNF-DEEP-MANIFOLD-NUTS-BRASS-FREE-P-P-/322757511607?hash=item4b25d8c9b7:g:NY4AAOSwQTVV-WOk

Richard

Edited September 21, 2017 by RLWP

[V_King]

Thanks Richard, ordered the nuts.

Now need to sort out the coolant hoses and fuel tank and hopefully will be back on the cut.