DB90
XS650 Addict
Anyone ever use a standard Grade 8 nut as a replacement?? Is there anything "special" about what the stock tappet lock nuts are made of? Seems to me plain old steel to me.
Maybe I'm the wrong guy to answer... my background's in aviation, where substituting parts can lead to a world of shit.Right. Grade 8 has a tensile strength of 150,000 ksi. I feel like that may be more than strong enough to withstand the forces it may be under.
I am no expert when it comes to bolts and nuts but grade 8 is standard for structural use.
Perhaps grade 10.9 or whatever it is may be better?
Me thinks it's a potentially very expensive experiment. If you want to begin to research the topic, look for proof load properties of bolt classes. Then it also has to "live with" the valve stem and vice versa.....IDKRight. Grade 8 has a tensile strength of 150,000 ksi. I feel like that may be more than strong enough to withstand the forces it may be under.
I am no expert when it comes to bolts and nuts but grade 8 is standard for structural use.
Perhaps grade 10.9 or whatever it is may be better?
I don't want to take the chance really. I was just curious because the tappet nut didn't seem to have anything special going on. At least from initial inspection. It had come off the Tappet and seems to have gotten squished a tiny bit by something in there (probably got caught by a cam lobe). I feel like if it were a hardened nut then it may not have gotten squished and chewed up as easily and without causing major damage to the cam, but I'm no expert.Seriously though, why take the chance
I think you're right!Btw.... that's a metric nut (I think). Grade 8 equivalent in metric would be a 10.8 nut.
Sounds about right.So, as long as my ass is out here, I reckon it makes some sense that the nut is softer. The adjuster has to be something akin to bearing steel, so it would take a relatively soft nut to get proper stretch at the normal torque - otherwise it wouldn't stay tight.
A little help here, Jim...anyone?
I guess a chick into heavy metalAnd who is Nicole?
I’m really curious about this statement, kinda scary….I don't want to take the chance really. I was just curious because the tappet nut didn't seem to have anything special going on. At least from initial inspection. It had come off the Tappet and seems to have gotten squished a tiny bit by something in there (probably got caught by a cam lobe). I feel like if it were a hardened nut then it may not have gotten squished and chewed up as easily and without causing major damage to the cam, but I'm no expert.
I think you're right!
What do you mean?I’m really curious about this statement, kinda scary….
I erased this reply once cuz (do no harm).
But when snugging nuts (these especially) my last motion is a slight jerk. With threads, tightening, torque there is a thing known as cold welding. We've all experienced it, that slight catch/graunch as the nut gets tight, stops. The feel/sound is small areas of the sliding metal faces micro welding. This is part of what keeps a tight nut in place. Dunno, but I've never had a tappet nut loosen and I don't go gonzo on the wrench.
PS using an offset 6 point wrench here is more than a suggestion. Finish with a slight bump on the wrench.
That is all.
PPS Nichole is a honey.
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