Gearbox casing cracks and ARP rod bolts
Turbo Mini Forums

Hello.

Firstly is this a common place to crack a gearbox casing? I dont think its a casting mark, but I could be wrong. Its on the top of the diff housing



And

Are these ARP rod bolts, I think I may have been mistaken. They are 6 years old if that makes any difference to design changes.



Much obliged

Nic

The bolts look like the uprated Mini Spares rod bolt there defently not ARP

And that does look like a crack in the casing Auto Test gearbox crack here all the time.

Thanks

That explains this then:


I may have slightly over tightened them

Its not a good weekend for building engines

better to kind out now eh,

ARP ones are black arn't they?

Fuck me Nic, I would have thought you would have stress relieved the gear case, or is that not one of yours :)

ARP bolts use a 6 sided nut, are black and have a far better finish on them, I dont recall them being knurled just under the head either.

Edited by Sprocket on 9th Apr, 2010.

Ill get some arp ones ordered, these have been holding up 7500rpm well though

The case was std, i was going to use another, got it on the bench to give it some work and spotted a horrible casting mark, picked up this one to go back to it and then spotted the crack.

Damn the slicks!!! They have cost me a fortune in repairs

The slicks cost me alot of money as well Nic! Flywheel, backplate and clutch plate. I'm glad the clutch slipped and saved the box.

Your casing definatly looks cracked.

thats the problem with cracks, theyre terribly moreish

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

They are definitely not ARPs.

In the 13's at last!.. Just

and i think it is not a crack but a casting joint,

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

All ARP bolts say ARP

If they have a small "Knob" on top of them, they are the uprated Minispares ones that now are discontinued.