Crank Bolt, It’s Not M8 x1.25 |
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Crank Bolt, It’s Not M8 x1.25 |
Mblizzard |
Aug 18 2019, 06:28 AM
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#1
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
This not a stock crank. The stock is M8 x1.25. I am sure this is some variation of the AA 78 mm crank but the bolt into nose of crank is clearly not stock.
As near as I can tell it is a M7 1.25. 1.0 is too coarse to start. Anyone know for sure what the threads are on these cranks and where to get the bolt? Type 4 store online has the stock bolt. |
Mark Henry |
Aug 18 2019, 08:21 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
It should be M8, I'd try chasing it with a tap or a stiff wire galley brush. Likely the tolerances tightened up during heat treating, dirt, or congealed storage coating.
Message the seller, if it's LN they'll likely check one to confirm. |
Mblizzard |
Aug 18 2019, 09:25 AM
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#3
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
It should be M8, I'd try chasing it with a tap or a stiff wire galley brush. Likely the tolerances tightened up during heat treating, dirt, or congealed storage coating. Message the seller, if it's LN they'll likely check one to confirm. Tired all that. M8 tap will not start. LN sent new bolts as they think it is M8. But I pulled my old broken crank from scrap pile and it is not M8 either. Yea should have kept that bolt but I always use new crank and fly wheel bolts. (IMG:style_emoticons/default/headbang.gif) Have 1.8 crank that M8 starts fine and even after inspecting the new crank with borescope I can’t see anything that would prevent bolt from starting. Will check with drill bit and tap in one combo to see just how far off it is. |
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