Jump to content
The mkiv Supra Owners Club

the impossible crank pulley bolt


suprasize

Recommended Posts

Okay, ill give a brief run down on what's what, and hope one of you guys can point me in the right direction..

 

Okay, during a timing belt change (incl pulley, tensioner and belt), the crank pulley bolt has decided not to budge atall. The garage who have been working on her have pretty much tried everything.. powerful air guns, scaffold bars to lever the breaker bar, heat guns.. everhthing! But still! No movement! :-( what has been suggested is to cut the bolt off and rethread through the crank..

Has anyone had this problem before?

Has anyone used a company who can rethread the bolt? Seems very specialist.

 

Please post any advice you guys have.

So annoyed and fed up.

 

Thanks

Dan

Link to comment
Share on other sites

Had the problem on a mates car, we used a torque multiplier.... We reckon it was close to 800 (not sure on the unit of measure but believe it should have been 259-300 ish) when the bolt finally decided to budge...

 

 

From what theyve said, they used the most powerful airgun snap on provide, and still it isn't budging. Its ridiculous. This car seems impossible.

Link to comment
Share on other sites

Put the large breaker onto it with the scafolding pole and put it on the ground. Use the starter motor to free it off. Be sure to put it to the correct side etc.

 

There is obviously a lot of danger in this approach but common sense should prevail.

Link to comment
Share on other sites

Put the large breaker onto it with the scafolding pole and put it on the ground. Use the starter motor to free it off. Be sure to put it to the correct side etc.

 

There is obviously a lot of danger in this approach but common sense should prevail.

 

This! The bolt is not torqed to that level. Its the massive amount of locktite that need to be "broken" trough

 

Doing as scott said will most likely free it!

Link to comment
Share on other sites

Well i dont know how big gun the biggest snap on is But i used a gun used when changing tyres on lorries. My impact Gun is huge and it made no differens But when i used the heavy duty one it broke free with ease. But you would need to remove all radiators as it take quite some space.

 

Good luck!

Link to comment
Share on other sites

It will come off they need to lock the pulley as mentioned.

 

 

cutting the bolt off and re-threading is a mad decision, And not a job id like to take on, Imagine drilling it out while the crank/engine is in postion.

 

 

Id take it somewhere else if they cant get it off, dont let them cut the bolt ffs.

Link to comment
Share on other sites

As said, it will come out with the locking tool without heat. You could use the biggest air impact type of gun there is, but unless its locked up it wont budge if it's a tight one. I have a had a couple now that local garages tried and gave up on, but I made a very basic tool to lock it via the threaded holes and they shifted. There is a guy on here who reckons you can lock it by using a cam pulley locking wedge tool.....all that torque through the belt and across the tensioner cant be good and if its a tight one the belt would just strip anyhow. Paul will have have a tool to lock the crank pulley I am sure.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.