Type-44: Tightening turbo oil lines - Bentley mistake?

[Fred Munro]

Ameer;

I found a similar mistake in the Bentley on the torque spec for the AAN
engine timing belt tensioner bolts. It has 3 M6 bolts that were speced at 20
Nm. I felt the bolt stretching long before I got near 20 Nm. I looked up the
specs for a T7 grade M6 bolt - 10 Nm. I replaced the bolt and used 10 Nm -
plus Loctite blue :o). Most of the M6 bolts on the engine are speced at 10
Nm - I think the Bentley may be mixing the odd M6 fastener with the torque
spec for the M8 (20 Nm).

One other thing on Bentley torque specs - I have found occasional errors in
their conversion from Nm to ft-lb, so I use the Nm figures unless I check
the conversion myself.

Fred Munro
'94 S4



-----Original Message-----
From: quattro-bounces at audifans.com
[mailto:quattro-bounces at audifans.com]On Behalf Of Ameer Antar
Sent: August 2, 2004 4:36 AM
To: Quattro List
Subject: Type-44: Tightening turbo oil lines - Bentley mistake?


This really doesn't seem to make sense, but the Bentley (as well as the
Haynes) says to tighten the bolts for the turbo oil lines to 18 ft-lbs.
These are the little M6 bolts that actually bolt into the turbo. I looked up
the torque chart for M6 and even w/ class 12.9 hardware, you can only get
about 12 ft-lbs out of 'em. Some how I doubt that'll work. Any experience or
BTDT's regarding the proper torque? Also how about the torque for the other
sides of the lines... one is M6 and bolts to the aluminum oil filter
housing, and the other is M8 and bolts into the block. I can't find any spec
for either. Thanks for the help.

-Ameer
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