Author Topic: Cylinder Head Tie Rods  (Read 1285 times)

David S

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Cylinder Head Tie Rods
« on: April 25, 2018, 02:43:21 PM »
The cylinder heads are pulled down to the crankcases with tie rods (four per cylinder). The cylinder heads have threaded inserts cast into them to receive the tie rods. I need to know what that thread is. As far as I can tell its 3/8” 16tpi Whitworth but it could be 3/8” 16tpi UNC. (Or it could be none of those!!) Does anyone out there know for sure?
DWS

David S

  • HOC Committee
  • Jr. Member
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  • Posts: 25
  • Brit Bike Fan
    • 1950 BSA A10 Golden Flash PMU121
Re: Cylinder Head Tie Rods
« Reply #1 on: April 25, 2018, 03:18:57 PM »
I think I've answered my own question. It's an M10x1.5mm left hand threads and not Whit or UNC.
DWS

Rob B

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Re: Cylinder Head Tie Rods
« Reply #2 on: April 25, 2018, 06:32:53 PM »
Correct DWS!

I had sixteen new sets made up by a local Engineer in Stainless Steel Type 303 which is excellent material in tension, and rustless. The sleeve nuts are 18mm hex head - 20 x 1.5 x 31 overall
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