crankshaft pulley bolt removal?

[edfishjr]

I'm doing the chain guides on my '92 Q45. I can see that guides are in pieces on both sides now that the top covers are off. But, how do you lock the pulley (or crankshaft) to untorque the pulley bolt?

Anyhelp would be appreciated.

Edwardo

[911/Q45]

Just put your long breaker bar and socket on the bolt and crank the starter instantaneously. Be sure the bar will hit the floor or frame, not something important and disconnect the ignition so it won't start. Putting it back together is a little tougher, 2 people, 4 foot pipe on wrench and a chain or strap wrench on the pulley.

[DAEDALUS]

Yeah, the starter will work, but if you don't have a method for torquing it back up, best to wait. Chain wrench/steel pipe works well. Strap wrench worked the first time, broke the 2nd time. After getting the bolt off be sure to turn th pulley to set the #1 piston to TDC on compression before removing the pulley.

[edfishjr]

Thanks a lot...never would have realized that the starter would be turning it in the right direction. This does seem kind of dangerous though, if you get the bar set on the wrong side...I suppose there is a special tool for gripping the pulley that the pros use?

[DAEDALUS]

Chain wrench is probably the best tool on this particular car for this particular job. Use a length of old belt between the chain and the pulley to protect the pulley and to keep the chain from slipping.

[edfishjr]

Daedalus: Thanks a lot for the advice. I must be the luckiest son of a gun in the world...all sorts of broken guide pieces rattling around in there for who knows how long and the chains never got jammed. I've got 154K and am replacing all 3 chains as well.

Thanks again.

[Q45tech]

While you are in there remove and disassemble the oil pump and measure clearances and look for scoring of impellers.

[forecast]

I suppose there is a special tool for gripping the pulley that the pros use?

A 400ft/lb impact wrench is all I've used to get the pulley bolts out. With that just grabbing a belt is sufficent to keep the engine from turning.

If you're dropping the pan to get out parts of the guide, an impact wrench will pay for it's self in short order when comes time to drop the cradle.

[Mayhem_J30]

probably a crude method, but i've always got a 2nd person and had them hold a large flat head screwdriver between one of the flywheel teeth while a turned the bolt.

[landtodd]

I didin't see anyone point out the importance of the 275 ft-lb spec on the 30mm bolt. Less than that and your oil pump may not turn. Me, I used my impact wrench at max settings and max air pressure. 7 seconds at full power to get it off, so 7 seconds at full power to put it back on. Yes, that's a little shady -- if I did it again, I would certainly think twice about that method of torque estimation. However, it worked.

[edfishjr]

Thanks to all those in this discussion. I got a chain wrench from Habor Freight for $12 to hold the pulley. With the pulley protected by a piece of belt that I taped on, it worked like a charm and was completely safe. I've got a 300 ft-lb torque wrench to get it back on with.