| Author | Message | ||
     Benjamin Newman New User Username: cloudscc123 Post Number: 4 Registered: 7-2016 |
Can anyone tell me the thread size and type for Silver Cloud 57 six cylinder exhaust manifold studs? I need to fix a thread and would like to purchase the correct tap. Also does anyone in Australia sell these studs? | ||
| christopher carnley Unregistered guest Posted From: 86.169.76.140 |
It is 5/16" UNF, the SAE threads. The studs are high grade steel typically EN24 or 1%Cr 1%Ni, and quite difficult to drill out. Introcar have them. (Message approved by david_gore) | ||
| David Gore Moderator Username: david_gore Post Number: 2197 Registered: 4-2003 |
Benjamin, Do not be tempted to use "high tensile" threaded rod from hardware stores to fabricate the studs as an alternative. These often come from low-cost manufacturers often in Asia and the quality control in their manufacture either leaves a lot to be desired or is non-existent. The OEM studs would be an alloy steel such as En24 [SAE 4340] or similar heat treated to SAE Grade 8 or equivalent specification. I would recommend purchasing the studs from a recognised R-R/B parts supplier such as Introcar as suggested by Christopher. | ||
| Benjamin Newman New User Username: cloudscc123 Post Number: 5 Registered: 7-2016 |
Thank you for the advice. For some reason I thought they may have been BSF sizes. I had one snap inside the block, but have been successful in drilling it out. A 6mm Cobolt did the trick. The remnants I tapped out with a centre punch.. Got a new quality 5/16 UNF tap. All clean now. I will purchase the real studs. Don't want to cut any corners. Thanks for the Introcar recommendation. | ||
| richard george yeaman Grand Master Username: richyrich Post Number: 613 Registered: 4-2012 |
Hi Benjamin there is nothing like a happy ending. Richard. |
