I never seen a new one in person so I have no idea if that's normal for some to have that.

out of 18 Tension bolt about 14 of them got a crack on top of the head and 16 of them got rust all over the bolt body.

I will be using all new housing so I think I should get new tension bolt with it right ?

and for Tension bolt if Im buying new, Mazda saids use N350-10-E51B instead of N350-10-E50A, my google search tells me that the E51B has heat shrink the middle part of the bolt to handle vibration a bit better. Anybody know the definite answer ?

Thanks

 

it's just a formation of the metal as it was cast, not a crack or anything to worry about.

 

nice

what if its ... rusted ?

cuz some one of are rusted ... the only one that has no rust at all is the longest "M" bolt. all other ones have some rust on them. hmm.

 

I'm just going to re-use it, Since the bolts are used/old I will torque it a bit harder to 30 ft lbs . that should be alright I guess ?

 

usually they are covered in oil and clutch dust but a little rust won't really hurt anything unless it is excessive.

 

cool, Thanks