On the picture below (on item 12 & 13), what luck have you guys/gals had removing the allen screw (hex head)? I need to remove these from the calipers to get powdercoated. Ideas? Does anyone know the exact size? It appears to be a 4mm.

TIA!

Andy

 

Thats may be a 5mmx12mm screw.

Those can be a bugger since its a steel screw inserted in an alloy hole and corrosion, electrolysis can freeze them in place without some "persuasion".

I use a liberal amount of professional-grade penetrating spray and leave it to sit overnight followed by some heat before starting the extraction.

 

Some later model 993 calipers are torx headed. From memory, I think Steve is correct at 5mm for the allen headed button heads.

More often than not, you may have to chisel them loose. They do pop loose but sometimes the help of a chisel (in the direction of CCW) is required.

Replacements can be sourced almost anywhere.

 

As always, thanks for your help! I'll put some penetrating oil on them tonight, and try some heat on Thursday.....hopefully they'll come out!

 

The other part that seems to help at least me is using the Snap-On stubby allen drivers -- like for the fan pulley bolts -- same thing, the stubby driver really helps crack these things loose!

 

Those can be a bugger since its a steel screw inserted in an alloy hole and corrosion, electrolysis can freeze them in place without some "persuasion".


and consider using an impact driver to utilize a few gently love taps.

Craig

 

Whatcha paying for the powdercoating?


Andreas

 

I used an "impact Driver" to loosen the screw on my 74 Carrera, don't be gentle, as you want to loosen it with te first blow, you don't want to mess up the screw by hitting it softly and then the next time the screw is buggered up because the wrench slipped. My father was a blacksmith and he dealt with these kind of problems in a very decisive manner. I put on a leather glove, hold the wrench tightly, then tap it a couple of times to get the impact driver's blow just right, then baaaaaang! It's done...

After all, as the saying goes, 'the lord hates a coward..."

Good Luck!

Bert

 

It really helps to go at the fastener with heat to loosen the thread-locker otherwise these are extremely difficult to remove.

 

Yup, same here. The shorter shaft means less torsional twist on the tool, and the twist is transferred to the fastener...and you get that nice **crack** sound when breaking them loose (which is actually a pretty scarey sound!)

Cheers,

Mike

 

Simsoapsizzler,
Success? Or did you board the Fail Boat?


Andreas