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DB18 CYLINDER HEAD STUDS THREAD SIZE

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John Hitchins
Site Admin
Posts: 192
Joined: Mon Feb 08, 2016 10:52 am
Location: Wellington Somerset

DB18 CYLINDER HEAD STUDS THREAD SIZE

Post by John Hitchins » Sat Aug 18, 2018 9:15 pm

Having had to drill the cylinder head studs out to remove the head can some one tell me the thread size please to clean up the block threads as they are a mess.
thanks

Johnsson
Posts: 53
Joined: Fri Feb 12, 2016 11:23 pm
Location: Brisbane, Australia

Re: DB18 CYLINDER HEAD STUDS THREAD SIZE

Post by Johnsson » Sun Aug 19, 2018 12:12 am

I think the originals are 3/8" BSW. I recently had to replace two of mine which were corroded into the block. They were 3/8" UNF (24 tpi) at the top and 7/16" BSW (20 tpi) at the bottom into the block. I made them up using a 7/16" high tensile bolt, cutting off the head and turning down and threading the BSW end.

Trevor.

John Hitchins
Site Admin
Posts: 192
Joined: Mon Feb 08, 2016 10:52 am
Location: Wellington Somerset

Re: DB18 CYLINDER HEAD STUDS THREAD SIZE

Post by John Hitchins » Sun Aug 19, 2018 11:14 am

Thanks Trevor, all this was caused by a stuck valve in the head, which has been a nightmare.

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