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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-11-2015, 09:34 PM
98OrientBlue 98OrientBlue is offline
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Location: Bay Area, CA, US
 
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Mein Auto: 1998 BMW 540i/6
Torque for TC tensioner wrong in Bentley?

Hi, I was just reviewing the Bentley guide again regarding the procedure for renewing the upper timing chain cover gaskets. On page 113-81 it states that the proper torque for the chain tensioner is 65Nm. I had recently replaced mine and thought that 65Nm felt really tight, but I must have pushed it to 55Nm or so. Thankfully I didn't tighten all the way to 65.

Now, I just checked the BMW Workshop Manual, and it says to tighten to spec "11 31 7AZ", which I believe for the M62 is ONLY 40Nm! Doh! Damn Bentley!

Do you all think I've done any damage to the upper timing cover case? Should I remove the tensioner, throw in a new crush ring and tighten to 40Nm? Will I get a leak if I do that? Arrrgggghhh.
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Old 03-12-2015, 11:56 AM
Matts6spd Matts6spd is offline
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Mein Auto: '03 540i M-Sport
If you did in fact over tighten it, I wouldn't try to take it back out. Leave it there unless you have a leak!
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Old 03-12-2015, 12:26 PM
98OrientBlue 98OrientBlue is offline
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Mein Auto: 1998 BMW 540i/6
Thanks, the issue is that I plan to remove the upper timing chain cover to replace the leaking gasket. That's why the tensioner needs to come out.

BTW, do you agree that Bentley is wrong? Or am I misreading the BMW workshop manual?
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Old 03-12-2015, 12:42 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
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Mein Auto: 02 BMW 525i M54 auto 130K
I don't know the answer but maybe there is additional information on the torque in one of these, found by typing /torque in the bestlinks...
- Complete 1997 BMW torque values for all nuts and bolts (pdf) & M62 engine-specific torque values for all nuts and bolts (pdf) & a conversion calculator for foot-pound/newton-meters (1) & the truth about spark plug torque and anti-seize sacrificial-anode paste (1) & automatic transmission torque values (1) & what torque to use when replacing the E39 I6 oil level sensor (1) & all torque values and specs needed for a 4-wheel brake job (1) & how to calibrate your torque wrench tools (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 03-12-2015, 12:46 PM
98OrientBlue 98OrientBlue is offline
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Location: Bay Area, CA, US
 
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Mein Auto: 1998 BMW 540i/6
Bluebee thanks. By way of reference, here's where it says to use "11 31 7AZ", which according to your first PDF says 40Nm.

Arrrghh. I thought Bentley was the "bible"!

Last edited by 98OrientBlue; 03-12-2015 at 01:00 PM.
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