Cam shaft pulley: really need help!!!

[jantd]

Hi guys,

I once read a text about the cam pulley, but can't find it.  Here's the question: I've changed my timing belt, and need to retighten the cam pulley. The engine is a 1.9 td aaz, and the shaft has no woodruff key, so if it slips, the engine is seriously damaged. My Haynes says you tighten with 4.5 daN.M, but I remember that this is too low,and I heard about slipped pulleys if only 4.5 was applied.
This really worries me, so is there someone who knows THE method to mount this pulley on the Cam shaft, so I have a peace of mind? I'd really appreciate.
Thanks a million..
Best regards,Jan

[addautomotive]

Lol... "rewhap" is my favorite new word!

[macsdub]

yea i like that too rewhap
yea do all that,and use a little scotch brite(like on kitchen sponges on 1 side)
brakecleen and all that,and do the wapping trick




actually chevy(actually gm in general i think) calls setting the thrust bearings "tonking" or "tonk"
like when you tighten up the caps,go to like the 1st stage+ tonk the crank back+forth to "set" the thrust bearings in place nicely
i tonked my tdi(i used a plastic mallet)
hit it,dont kill it :wink:

[jantd]

hi guys,
thanks a lot for all your advice, really great to have your help!!
so I tightened with 45ftlbs, hit the bolt as well as i could (the gas filter is a bit in the way), and in my case the bolt didn't turn anymore below 45ftlbs, I guess it was right from the first time..i must say that 45 ftlbs didn't feel like a big torque..
i turned twice the crank, and seems alright..
do you think it's a good idea to loosen the bolt now and put loctite on it, or would it be too hard to loosen?
i still have a 0.15 mm difference between both sides of the camlocktool,should i worry?
thanks,Jan

[QuickTD]

I've always just tightened them to the recommended torque, no hammering, no locktite and no problems. Tapered fits grip like grim death. If you hang around a machine shop for any length of time you'll soon notice that most cutting tools are retained by tapered fits, they often transmit 20hp or more without slip. A bolted tapered joint is absolutely 100% reliable, I wouldn't worry about it.

[Kudagra]

Newer bobcats have a taper fit on the front pivot. I impact gun the hell out of them (800 ft/lbs) then I use my adjusting tool (16lb hammer with a 1ft handle). Then I usually get 1/3 of a turn.  Usually I have to do this 2-3 times till I cant get the bolt to turn anymore.

Not as important as a cam bolt but it gets alot of abuse and thats the only way I can make it so I dont have to go out and do it again.

The shock of the hammer strike just helps the taper fit better.


heh...I want to dyno my impact gun.