02-07-2020, 03:30 PM
One of the tapped holes in the top of the crankcase "bell housing" where the starter motor housing bolts has stripped.
Approximately 6mm of thread has stripped as a result of using too short bolts but this still leaves around 9mm of good full thread plus a further 5mm of thread on one side only where the tapped hole runs into the curved section where the flywheel runs.
I am wondering whether it's best to drill out the thread and fit a helicoil but, as standard, they are 1.5 x Diameter long so this would give me around 12mm of good thread. Alternatively I did wonder about just using longer bolts which would be engaged with the 9mm of remaining good thread plus gain some additional strength from the partial thread below that.
I think I'm talking myself into the helicoil option but wondered what others thought.
I'm not very keen to add additional fixing holes either side of the existing as I have seen suggested elsewhere.
John.
Approximately 6mm of thread has stripped as a result of using too short bolts but this still leaves around 9mm of good full thread plus a further 5mm of thread on one side only where the tapped hole runs into the curved section where the flywheel runs.
I am wondering whether it's best to drill out the thread and fit a helicoil but, as standard, they are 1.5 x Diameter long so this would give me around 12mm of good thread. Alternatively I did wonder about just using longer bolts which would be engaged with the 9mm of remaining good thread plus gain some additional strength from the partial thread below that.
I think I'm talking myself into the helicoil option but wondered what others thought.
I'm not very keen to add additional fixing holes either side of the existing as I have seen suggested elsewhere.
John.