Crank pulley = death?!
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This is a discussion on Crank pulley = death?! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So I just got back from the garage and managed to switch out the stock crank pulley with the cobb ...

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    Unhappy Crank pulley = death?!

    So I just got back from the garage and managed to switch out the stock crank pulley with the cobb lightweight one. Here's the issue:
    1. Finally uncorked the pulley's bolt.
    2. The crank pulley was still on soo tight I put the belts back on and tightened everything up with the crank bolt out.
    3. Started the car back up to loosen up the crank pulley.
    4. As soon as I heard the crank pulley come off, the car was still running for about 3 secs before I could shut it off.
    5. Took the stock crank pulley out and replaced it with the lightweight cobb one and tightened everything up.

    So my question is: Because the pulley and belts were off for a few seconds while the engine was running, will there be any timing issues? Is there anything else to consider, like the recommended bolt torque?

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    Administrator Trainrex's Avatar
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    Quote Originally Posted by FlyBoyE83 View Post
    So I just got back from the garage and managed to switch out the stock crank pulley with the cobb lightweight one. Here's the issue:
    1. Finally uncorked the pulley's bolt.
    2. The crank pulley was still on soo tight I put the belts back on and tightened everything up with the crank bolt out.
    3. Started the car back up to loosen up the crank pulley.
    4. As soon as I heard the crank pulley come off, the car was still running for about 3 secs before I could shut it off.
    5. Took the stock crank pulley out and replaced it with the lightweight cobb one and tightened everything up.

    So my question is: Because the pulley and belts were off for a few seconds while the engine was running, will there be any timing issues? Is there anything else to consider, like the recommended bolt torque?
    No timing issues, but not the smartest thing to do. If you damage the end of the crank doing so, the engine will have to be pulled and disassembled to fix.

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    Registered User rr1911's Avatar
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    Quote Originally Posted by Trainrex View Post
    No timing issues, but not the smartest thing to do. If you damage the end of the crank doing so, the engine will have to be pulled and disassembled to fix.
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    Registered User Timdog1650's Avatar
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    You should re-read Cobb or Perrin's install instructions to make sure everything is put together properly once you're done. You need to make sure everything is torqued to spec because, like was said, the life of your engine is on the line if that crank is damaged.

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    How would you be able to tell if the crank is damaged? Oscillation?

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    Registered User rr1911's Avatar
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    do a compression test as well as a timing test... keep an eye out for cel's
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    Registered User Timdog1650's Avatar
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    Quote Originally Posted by FlyBoyE83 View Post
    How would you be able to tell if the crank is damaged? Oscillation?
    any kind of vibrations or unevenness when you rev would indicate you've done something funky. Also, a visual inspection is probably the best indicator....the little tooth that sticks out of the top of the crank shaft is relatively delicate and if it becomes damaged you need to replace the crank or become really creative with your use of spacers and shims. Basically, if everything fits together properly then no worries, but if the new pulley didn't go on 100% snug, then you want to take another look.

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