PDA

View Full Version : Crank Keyway Sheared Info?



Tanzimur
03-11-2015, 06:57 PM
So all theese threads are popping up with a sheared keyway on most 98 and up engine 1.8t's i tried to search but didnt find much info on exactly what year or engine codes does this happen and why?

GrapeBandit
03-11-2015, 07:27 PM
all of them bust.i had 2001 and a 99 shear on me. do yourself a favor and pin your crank. check out my thread, I had some serious damage from it

RENOxDECEPTION
03-11-2015, 09:17 PM
I've seen it happen to one, luckily *knock on wood* it hasn't happened to my daily.

Tanzimur
03-11-2015, 10:14 PM
damn what do you mean by pinned?
and why does it happen though?

RENOxDECEPTION
03-11-2015, 10:18 PM
Well, not specifically sure why it happens, most likely due to the twin cam 20 valve valvetrain changing rpms rapidly and a slightly loose/stretched crank bolt.

pinned = dowel pinned = two pins that do the same job as the keyway.

GrapeBandit
03-11-2015, 10:21 PM
damn what do you mean by pinned?
and why does it happen though?
it happens because the crank timing gear gets old and weak I guess.

pinning the crank is drilling, then reaming a hole through the crank gear and into the crank. then you install an alloy steel dowel pin or two. integrated engineering sells a kit to do it, but you can DIY it for less than half their cost.

Seerlah
03-12-2015, 03:19 PM
damn what do you mean by pinned?
and why does it happen though?

Most believe it is due to incorrect install of the crank bolt. It has some ridiculous torque spec and loctite must be used. It is the fear of mine shearing that I am only tuned for 25psi. I picked up the IE billet press fit gear and will be installing that very soon. But the key way giving is one of my biggest fears.

redline380
03-12-2015, 04:33 PM
Wanna know something funny? I torqued mine and went to give it the last 180 degrees and could only possibly get about 110 degrees after torqueing. Knocking on wood

Seerlah
03-12-2015, 04:46 PM
I couldn't get those extra (2) 90* torques either. Mine has also been holding up...so far. But made myself a crank bolt tool, so that'll be used next time (like...very soon).

http://s17.postimg.org/v1xw674kv/crankshaft_tool_1.jpg

redline380
03-12-2015, 05:02 PM
Yeah, I'm making something like that next time. Its simply impossible to get that extra few degrees.

But that bolt and the axle bolts are why I bought this badass. 2 feet long and has yet to be tamed


http://www.matcotools.com/ProductImages/cfr248lftg.jpg

Tanzimur
03-12-2015, 09:50 PM
Cool ima have to check mine out lol i know my crank pulley fell off last summer and luckily was close to home i beleive i reinstalled a new timing gear and crank with loctite!

BaseDrifter
03-12-2015, 11:34 PM
I believe the AWM crank bolt gets stretched more than the AEB does. AEB is only 90 degrees.

This is the tool I made to lock the crank down while tightening and stretching the bolt.

http://i346.photobucket.com/albums/p439/blkA4alb-3/A4%20B5/DSC07817_zpse6d2dbea.jpg

Tanzimur
03-13-2015, 05:31 AM
I believe the AWM crank bolt gets stretched more than the AEB does. AEB is only 90 degrees.

This is the tool I made to lock the crank down while tightening and stretching the bolt.

http://i346.photobucket.com/albums/p439/blkA4alb-3/A4%20B5/DSC07817_zpse6d2dbea.jpg

Thats what i fugred cause i barely hear about aeb having sheared crank bolts... and btw what type of degreaser do you use? i mean my bay is pretty damn clean but i got nuthn related to urs... make me feel like shit lmao