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Tiller stud removal

Posted: Tue Jun 23, 2020 1:58 am
by andrew
Any tips on getting these out other than the usual heaps of heat?

Trying to swap one out from a spare crank case to my current project, but couldn’t get either stud out with heaps of heat and a hefty pair of vice grips. I don’t want to shear the studs so thought I would check on the forum before giving it another go. I believe they are threaded the usual way?

Re: Tiller stud removal

Posted: Tue Jun 23, 2020 6:42 am
by tambikeboy
I'd suggest exactly what you're doing I've done many 2 in a row doesn't sound right (silly question are you tightening and not loosening) :twisted: :twisted:

Re: Tiller stud removal

Posted: Tue Jun 23, 2020 7:01 pm
by andrew
One came out today, from the donor FP case. Center portion a bit scraped up from the grips but threads in good condition, will be fine once cleaned up a bit.

But the stud in the SJM has less non-threaded portion to grip onto, only about 4mm protruding versus about 8mm on the FP. Already chewed it up a fair amount. Now to decide whether to have one last go and risk shearing/ruining, or try to salvage the existing stud after messing it up quite a bit. A classic dilemma!

Re: Tiller stud removal

Posted: Tue Jun 23, 2020 10:48 pm
by Charles uk
The normal way to remove these is 2 x 3/8" BSF nuts locked together on the outer thread & soak in penetrating oil for a couple of days, then with a 3/8 BSF ring spanner on the nut closest to the crankcase try undoing in the normal direction, if it feels like you might shear the thread off, try a small amount of heat!

Put your vice grips somewhere where they're hard to find, it will save you the cost of a new stud!