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| Camshaft retaining bolts (sprint) http://forum.triumphdolomite.co.uk/viewtopic.php?t=34690 |
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| Author: | cleverusername [ Tue Jan 29, 2019 5:37 pm ] |
| Post subject: | Camshaft retaining bolts (sprint) |
Does anybody know the correct strength rating for these? I can't find the bolts for sale anywhere and since I would prefer them not to shear; I would like to buy bolts that are strong enough for the job. |
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| Author: | soe8m [ Tue Jan 29, 2019 7:37 pm ] |
| Post subject: | Re: Camshaft retaining bolts (sprint) |
These two aren't up for the job anyway, even in a stronger variant. They would be 10.9 or 12.9. You can drill two extra holes to have 4 in total but better would be using 4x 5/16 bolt. Jeroen |
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| Author: | cleverusername [ Sat Feb 02, 2019 12:12 am ] |
| Post subject: | Re: Camshaft retaining bolts (sprint) |
Quote:
These two aren't up for the job anyway, even in a stronger variant. They would be 10.9 or 12.9.
Are you sure about those strength ratings? The bolts supplies are selling for the camshafts on a Stag are only grade 5 (three lines on the bolt).You can drill two extra holes to have 4 in total but better would be using 4x 5/16 bolt. Jeroen If the bolt is too hard, isn't it going to be brittle and be in danger of fracturing? |
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| Author: | trackerjack [ Sat Feb 02, 2019 9:42 am ] |
| Post subject: | Re: Camshaft retaining bolts (sprint) |
Well this has to be a first for me as on this one 12.9 would perhaps be too high a tensile strength for this application. 8.8 (grade 5) 1/4 UNF would be the correct to absorb the shock and I agree with Jeroen that 4 off bolts are better and I have a drill jig that I use to drill both the cam and the sprocket and I tap the holes 6 mm on the extra 2 holes so that the timing cannot be done wrong. When visiting Thruxton race meeting a few years ago a dolomite sprint had wrecked its engine when the cam sprocket broke free which prompted me to add 2 more bolts. When I build an engine for someone I offer this mod. |
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