Torque for Timing Belt Pulleys
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This is a discussion on Torque for Timing Belt Pulleys within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; The Subaru manual says to snug the 10 mm allen head bolts, then turn them 1/4 turn. This is a ...

  1. #1
    Registered User Heater Guy's Avatar
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    Torque for Timing Belt Pulleys

    The Subaru manual says to snug the 10 mm allen head bolts, then turn them 1/4 turn. This is a lot of torque for a allen head bolt. Do these bolt need stretch to secure them. Sometime we round out the allen bolt when we install them but, worse, we round them out when trying to remove them.

    Any suggestions? How do you do it?
    Walnut Creek, CA

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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by Heater Guy View Post
    The Subaru manual says to snug the 10 mm allen head bolts, then turn them 1/4 turn. This is a lot of torque for a allen head bolt. Do these bolt need stretch to secure them. Sometime we round out the allen bolt when we install them but, worse, we round them out when trying to remove them.

    Any suggestions? How do you do it?
    What bolts? The pulleys are spec'ed to 39 Nm (28.9 ftlb) in the manual. Sorry I don't follow.
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    Registered User Heater Guy's Avatar
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    The manual says: "Tighten to 30 N-m (3.1 kgf-m, 22.1 ft-lb) of torque, and then tighten further by 45 degrees" That 45 degrees puts a lot of torque on that bolt! This is from a factory manual page ME(H4DOTC) -59
    Walnut Creek, CA

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    He simply abides. SD_GR's Avatar
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    I quoted the specs from "2002 IMPREZA SERVICE MANUAL" in the "ENGINE2 [sic] SECTION" with a part number (for the manual I suppose) on the lower right of the first page that says "G1830BE3" and on that manual on pg 59 it shows how to remove the cams themselves. I suspect we are looking at different books.

    Are you installing the pulleys for the timing belt? If so, I torqued mine to the above specs. There was no mention of the 1/4 turn of which you speak. I went to 39 Nm (28.9 ftlbs) on all the idlers and also on the timing belt tensioner. My motor is the 2.0L turbo DOHC model from a 2002 WRX.

    Also, you mentioned Allen sockets. The idlers and tensioner do not use Allens. On my motor they are regular bolts. It is the cam sprockets themselves that use a 10 mm Allen.

    This thread has pictures that show the pulleys do not use Allens:
    Timing Belt and Water Pump Replacement

    and this thread has pictures that show the cam sprockets do use Allens:
    Cam seals, crank seal: Replacement? How?

    I'm therefore unsure of which bolts you are concerned.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
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    Registered User Heater Guy's Avatar
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    Cam Sprocket Torque

    These 4 bolts hold the 4 pulleys for the timing belt.
    The manual is "Subaru Complete Factory Repair Manual, 2009 IMPREZA WRX STI" it is on disc.
    What do you torque the pulleys to?

    I have attached a photo of the page which shows the torque requirement.
    Attached Thumbnails Attached Thumbnails Subaru Sprocket.jpg  
    Walnut Creek, CA

  7. #6
    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by Heater Guy View Post
    These 4 bolts hold the 4 pulleys for the timing belt.
    No. Those four bolts hold the camshaft sprockets. The pulleys for the timing belt are the rollers and the tensioner that you see on the front of the motor.

    The manual is "Subaru Complete Factory Repair Manual, 2009 IMPREZA WRX STI" it is on disc.
    What do you torque the pulleys to?
    Your car and manual are both different to the car and manual I used. DISREGARD ANY/ALL torque specs I've quoted. You have a different motor!

    I have attached a photo of the page which shows the torque requirement.
    I see it. I'm sorry to have confused you. Our motors are DIFFERENT!.

    However, I see it says to add 45' to each bolt.

    45 degrees is NOT 1/4 turn. A full turn is 360 degrees. Therefore 45 degrees is 1/8 turn. I read the instructions as "torque to spec then nudge it slightly" but that's just me. Regardless, I disagree with your initial statement about turning 1/4 turn. I would NOT do that.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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