Cass944

yeah...

what now

the 12 point bolt inside the cam sprocket is stripped.

Bones944

Same thing happened to me a couple of years ago. I used a pneumatic hand grinder, similar to a Dremel tool, and ground off the head of the bolt. It took an hour or so, but the shaft came out with my fingers when done. I ALWAYS replace the cam bolt when I remove it; they only cost $3.
HTH

ibkevin

Drill out the hole enough for the head to come off, remove the sprocket, throw a stud extractor on it, and--have a replacement ready to go!!

I used the original version hex head as my replacement.

Cass944

ok im all the way up to the biggest drill bit i have. and the head still has not come off. whats the biggest size i should need.

im at... uhh the number on the bit looks like... 21/64 or 5/16 is another bit that i was using they seem to be the same size though. but i mean dang how wide is the bolt.

Cass944

ok i got pretty far with a 3/8 bit but still no luck. do i need a bit that is actually bigger than the opening in the top of the bolt?

Cass944

ok i found a thread saing to use a 7/16 so i found that and now im like half way throuhg this bolt and i cant tell if im even geting any further... time for a break.

Sam Lin

You need to drill the head off, which means a bit nearly as large as the bolt head at least.

Sam

Cass944

thats what im doing. its just going sooooooo slow.

Cass944

i was just informed i a using a cement drill... that might be a problem

Chris Prack

Uh yeah.........concrete drill bit no good. Switch to a metal bit. While it is less challanging, it makes up for in speed.

The bolt is a 10mm bolt. You only need to go just over 3/8's and wiggle the drill. The head of the bolt will come off and you can then remove the rotor drive. Once that is off the remaining bolt will turn out by hand.

Granite 944

I've drilled many a bolt head off destroyed fasteners. The only "trick" is to drill up to and no more than the diameter of the bolt itself, not the head size (slightly under the diameter of the bolt is preferable), but you must be drilling dead center of the fastener to achieve the proper result. Make sure your not drilling into the bolt head any deeper than the head. The center of a regular twist drill can go deeper than the head, but not the full diameter of the drill, or, if your off center, you couldl be drilling into parts you really don't want to destroy. If you do just this in this manner, and head hasn't "fallen" off, you can sometimes smack it from the side, and get it to finish breaking off. 3/8” Drill bit is the largest I would recommend stepping up to. Drill as straight as you possibly can. Use a 90 degree motor or 90 degree motor adapter if you are drilling it while still on the car. A regular twist drill bit is the way to go.

Pic of 1st (hopefully last) cambolt I had to drill out. I drilled a bit to deep, but was pretty well centered





Good Luck!!

Lead Foot 944

I dont even know what to say......Did you use a 12 point driver in the first place....? Or use something else..like a torx.....Got called into work today......still going to the car show though...tomor.....

DAmian

944T4ME

I have a set of extractors if you need to use some once you get that head off. Also, you can take a chisel and cut a groove, the deeper the better. Then just use a flathead and unscrew it. Once the head is off, it will take very little pressure to unscrew it. I have 12pt drivers if you need, too.

Cass944

i have lots of 12 point drivers. no luck with that though too i took every precaution possible to make sure the ratched stayer straight aligned with the bolt too. it just wasnt gonna go. it doesnt really matter anyway its just a cam i got for free to use while mine gets powdered.

Cass944

ok started at like 10 this morning. and now its about 1:12 am and its still not all the way through. im suprised the drill has lasted this long. havent broke any bits yet though.