just to clearfiy about the crank bolt
Thread Starter
Joined: Feb 2004
Posts: 1,667
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From: jacksonville, fl
just to clearfiy about the crank bolt i have done some research but nothing that is really clear about what the best way to do it is. i am talkin about putting the pulley back on. i just read somewhere about using a threaded stud with a nut and a couple of washers to put the pulley on. now if i do it that way can i use the stock crank bolt? and will it be ok. and if i do need to buy a longer crank bolt, where is the best place to get one at? thanking you in advance!
daniel
daniel
it is much smarter to just get a new one.
The old one will have been stretched and will not torque down correctly..... takes way less effort to put on a new one correctly
but you can use the old bolt to seat the pulley properly after using the rod and nut with washers to pull it on...
Grab your biggest torque wrench and attempt to torque that old bolt down to 240lbft. Now, break the bolt free and remove it.
Take your NEW crank pulley bolt and thread it in all the way by hand. Torque this bolt to 37lbft. Now, we need to stretch the bolt into place. Get your breaker bar and pipe extension, and try to turn the bolt 140degrees past where it is at now...
it is easiest to mark the bolt with a line across it so you can get the degree's right.
(140* is 90* + a little past another 45*)
The old one will have been stretched and will not torque down correctly..... takes way less effort to put on a new one correctly
but you can use the old bolt to seat the pulley properly after using the rod and nut with washers to pull it on...
Grab your biggest torque wrench and attempt to torque that old bolt down to 240lbft. Now, break the bolt free and remove it.
Take your NEW crank pulley bolt and thread it in all the way by hand. Torque this bolt to 37lbft. Now, we need to stretch the bolt into place. Get your breaker bar and pipe extension, and try to turn the bolt 140degrees past where it is at now...
it is easiest to mark the bolt with a line across it so you can get the degree's right.
(140* is 90* + a little past another 45*)
Last edited by soundengineer; Jul 7, 2004 at 08:21 PM.
Thread Starter
Joined: Feb 2004
Posts: 1,667
Likes: 0
From: jacksonville, fl
so after i turn the bolt 140*, do i try and torque it down to 240lbs? or just leave it where it is after i turned it 140? thanks for all the help. would the best place to get the new crank bolt be at gm? thank you!
daniel
daniel
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Originally Posted by MechMan
screw that, just impact it on. there done
and when it comes off... it will do a lot of damage.....possibly to other peoples cars if it hits them......
always do stuff to proper torque specs
Originally Posted by MechMan
We have done probably 50-70 that way.
The only ones we have ever seen fall off are the one done the way you are tellin him
The only ones we have ever seen fall off are the one done the way you are tellin him
I'm stating the way GM recommends... it is a torque to yield bolt...
it is made to stretch into place..... by going 140* after 37ft/lbs
10 Second Club
Joined: Nov 2001
Posts: 276
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From: So. Fl.
Originally Posted by soundengineer
I'm stating the way GM recommends... it is a torque to yield bolt...
it is made to stretch into place..... by going 140* after 37ft/lbs
it is made to stretch into place..... by going 140* after 37ft/lbs
we have been installing them with the impact for a few years now.
And never had 1 problem
140* past 37ftlbs is a whole lot of moving. not as easy as it sounds. use a thread rod get some washers and lube them up good or better yet go get a wheel bearing from autozone and use that with a washer. thread the new balancer on that way. take the old bolt and use it put the balancer the rest of the way on if need be, then get a brand new GM bolt or arp if you like and put it in. use antiseize or oil to lube it. hit it with a very strong gun using impact sockets only(they fit tighter to minimize slippage). hold it there until you see the bolt no longer turning. done voila it shouldnt move.
note the balancer must be seated before you put the impact on it and use the new bolt. and when i say strong impact im talking half inch drive, breaks cross threaded bolts off when necessary strong. do not use some weak *** 3/8 impact it its not strong enough.
note the balancer must be seated before you put the impact on it and use the new bolt. and when i say strong impact im talking half inch drive, breaks cross threaded bolts off when necessary strong. do not use some weak *** 3/8 impact it its not strong enough.
Originally Posted by MechMan
We have done probably 40-50 that way.
The only ones we have ever seen fall off are the one done the way you are tellin him
The only ones we have ever seen fall off are the one done the way you are tellin him
Sorry man but we've done way more pulleys then that doing it the correct way and we've never had a single one come off. Have you personally done one the correct way and had one come off? I don't think so. The one's that have come off I can bet that they either didn't follow the correct specs or didn't use a new bolt.
An impact gun is not the way to put a pulley on and nor is it good for the bearings.
Originally Posted by Paul @ Thunder
Sorry man but we've done way more pulleys then that doing it the correct way and we've never had a single one come off. Have you personally done one the correct way and had one come off? I don't think so. The one's that have come off I can bet that they either didn't follow the correct specs or didn't use a new bolt.
An impact gun is not the way to put a pulley on and nor is it good for the bearings.
An impact gun is not the way to put a pulley on and nor is it good for the bearings.
Staging Lane
Joined: Jul 2004
Posts: 82
Likes: 0
From: Northern California
Originally Posted by Paul @ Thunder
Sorry man but we've done way more pulleys then that doing it the correct way and we've never had a single one come off. Have you personally done one the correct way and had one come off? I don't think so. The one's that have come off I can bet that they either didn't follow the correct specs or didn't use a new bolt.
An impact gun is not the way to put a pulley on and nor is it good for the bearings.
An impact gun is not the way to put a pulley on and nor is it good for the bearings.
Amen!
