Logo
Builders' Plan Gallery  |  Hip Pocket Web Site  |  Contact Forum Admin  |  Contact Global Moderator
September 18, 2019, 03:44:40 PM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with email, password and session length
 
Home Help Search Login Register
Pages: [1]   Go Down
Print
Author Topic: Taipan 2.5 Gold Head glow  (Read 197 times)
0 Members and 1 Guest are viewing this topic.
Fourfingers
Silver Member
****

Kudos: 0
Offline Offline

United Kingdom United Kingdom

Posts: 121

Topic starter


Ignore
« on: August 31, 2019, 11:28:10 AM »

Can anyone identify the thread type for the cylinder head screws, please?
Roughly 30 x 3.2 mm.  Soft slot heads, to be replaced by capheads I hope.
The redoubtable Mr Duncan reckons they are M6 pozidrive .... surely not?
Have tried all my metric spares, nothing fits the thread.
Duncan was right about one thing, though, fantastic motor!
Thanks
ff
Logged
Fourfingers
Silver Member
****

Kudos: 0
Offline Offline

United Kingdom United Kingdom

Posts: 121

Topic starter


Ignore
« Reply #1 on: August 31, 2019, 12:47:16 PM »

Should have said ...about 40 threads per inch.
Logged
3931bob
Copper Member
**

Kudos: 5
Offline Offline

United States United States

Posts: 8



Ignore
« Reply #2 on: September 02, 2019, 12:09:10 AM »

Reviews says the head screws are 2.5M.6 Posidrive screws and strongly advise using a #2 Posi screwdriver.
Logged
Fourfingers
Silver Member
****

Kudos: 0
Offline Offline

United Kingdom United Kingdom

Posts: 121

Topic starter


Ignore
« Reply #3 on: September 02, 2019, 04:40:18 AM »

Thanks Bob
Mine have obviously been replaced at some point as they are mostdef slots!  Soft, too.
Never did get to grips with pozidrives - thought they had gone forever.
So,M6 posi is not the same as M6 metric .... nearest I could get from the measurements was 1/8" BSW.
More research needed methinks!
Ff
Logged
qazimoto
Bronze Member
***

Kudos: 2
Offline Offline

Australia Australia

Posts: 46



Ignore
« Reply #4 on: September 06, 2019, 12:32:14 AM »

Thanks Bob
Mine have obviously been replaced at some point as they are mostdef slots!  Soft, too.
Never did get to grips with pozidrives - thought they had gone forever.
So,M6 posi is not the same as M6 metric .... nearest I could get from the measurements was 1/8" BSW.
More research needed methinks!
Ff

Possibly US 5:40 which are very close to 1/8" Whitworth. I'll check my Goldhead.

Burford was much more likely to use US threads than Metric.
Logged
Fourfingers
Silver Member
****

Kudos: 0
Offline Offline

United Kingdom United Kingdom

Posts: 121

Topic starter


Ignore
« Reply #5 on: September 06, 2019, 05:07:24 AM »

Many thanks Gaz
Woud be most interested in confirmation.  I can source UNC capheads OK here.  Another thread Ive never encountered before!
By the bye, my Goldhead seems extremely economical on straight 80/20.  Beautiful motor.
Ff
Logged
greggles47
Gold Member
*****

Kudos: 11
Offline Offline

Australia Australia

Posts: 282




Ignore
« Reply #6 on: September 06, 2019, 10:56:12 PM »

Maria's book on Burford engines lists the head screws as 4-40. Yours may have been replaced by the larger 5-40.
Logged

There must be some way out of here, said the joker to the thief,
There's too much confusion, I can't get no relief
qazimoto
Bronze Member
***

Kudos: 2
Offline Offline

Australia Australia

Posts: 46



Ignore
« Reply #7 on: September 07, 2019, 01:32:34 AM »

Yes, mine is 4:40 as well. This is an early metal backplate version not the plastic one. Anything is possible, thread change between batches, special job for Japan or the US etc. The only difference between 5:40 and 1/8" Whitworth is the thread angle, 60 v/s 55 degrees respectively.  Longer versions of Whitworth cap screws are like hens teeth but the 5:40 should be available in the model engineering supply dealers.
Logged
Fourfingers
Silver Member
****

Kudos: 0
Offline Offline

United Kingdom United Kingdom

Posts: 121

Topic starter


Ignore
« Reply #8 on: September 07, 2019, 11:07:46 AM »

Many thanks to all repliers ...
I have ordered some 1/8th UNC 40 tpi stainless bolts ...
Bet they dont fit!
John
Logged
Pages: [1]   Go Up
Print
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!