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Torque spec for rear underbody chassis braces?
- MrPT
- Lifer
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Torque spec for rear underbody chassis braces?
Hi,
Been looking for torque values for the rear diagonal chassis brace bolts. Does anybody know?
I've got a bit of a clunk at the rear, so just checking rear ARBs, struts etc, one at a time. Pretty sure it's the KW shocks - they are only one click from full "soft" at the moment - but thought it worth checking the braces while she's up in the air.
Cheers!
P.
Been looking for torque values for the rear diagonal chassis brace bolts. Does anybody know?
I've got a bit of a clunk at the rear, so just checking rear ARBs, struts etc, one at a time. Pretty sure it's the KW shocks - they are only one click from full "soft" at the moment - but thought it worth checking the braces while she's up in the air.
Cheers!
P.
2008 Z4MC: heavy wheels | crap suspension | skittish rear end | wobbly engine | not enough induction noise | underwhelming turn in | inconsistent braking | lardy battery | chubby steering wheel
2006 Z4 2.5si: gone
2006 Z4 2.5si: gone
- Smartbear
- Lifer
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Torque spec for rear underbody chassis braces?
Hi, reading this made me wonder if the z4m suffered from the diff mount becoming detached as the z3m/m3 have been known to fail?
Rob
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
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Torque spec for rear underbody chassis braces?
MrPT wrote: ↑Sun Sep 17, 2017 10:57 am Hi,
Been looking for torque values for the rear diagonal chassis brace bolts. Does anybody know?
I've got a bit of a clunk at the rear, so just checking rear ARBs, struts etc, one at a time. Pretty sure it's the KW shocks - they are only one click from full "soft" at the moment - but thought it worth checking the braces while she's up in the air.
Cheers!
P.
Can't find values for them on TIS
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- Lifer
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Torque spec for rear underbody chassis braces?
The lower ones that meet at the diff?
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
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Torque spec for rear underbody chassis braces?
No
///M|Silver Grey|Black Leather|BT|Nav|DSP|Heated Seats|PDC|Stubby|Turner Limiters|Turner Rear Top Mounts|Bilstein B12|Powerflex ARB Bushes|Powerflex Lollipops|M-Track|
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- MrPT
- Lifer
- Posts: 4746
- Joined: Sun Oct 21, 2012 7:44 pm
- Location: Bucks/Oxon
Torque spec for rear underbody chassis braces?
Yep.
2008 Z4MC: heavy wheels | crap suspension | skittish rear end | wobbly engine | not enough induction noise | underwhelming turn in | inconsistent braking | lardy battery | chubby steering wheel
2006 Z4 2.5si: gone
2006 Z4 2.5si: gone
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- Lifer
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Torque spec for rear underbody chassis braces?
From TIS:
51 71 482 is the process, don't drive without them fitted. The nut is the one in the middle, screws at each end.
51 75 5AZ: Replace screws
59 Nm + 90 degrees
51 75 7AZ: Replace nut
24 Nm
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
- MrPT
- Lifer
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- Joined: Sun Oct 21, 2012 7:44 pm
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Torque spec for rear underbody chassis braces?
Nice one, thanks Steve.Scooba_Steve wrote: ↑Sun Sep 17, 2017 3:07 pmFrom TIS:
51 71 482 is the process, don't drive without them fitted. The nut is the one in the middle, screws at each end.
51 75 5AZ: Replace screws
59 Nm + 90 degrees
51 75 7AZ: Replace nut
24 Nm
Looks like it's the same procedure for loads of models. I'm taking the "don't drive without them fitted" to mean they don't do nothing and are worth re-torquing every few years!
2008 Z4MC: heavy wheels | crap suspension | skittish rear end | wobbly engine | not enough induction noise | underwhelming turn in | inconsistent braking | lardy battery | chubby steering wheel
2006 Z4 2.5si: gone
2006 Z4 2.5si: gone
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- Lifer
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Torque spec for rear underbody chassis braces?
Welcome, ref is only so you know I'm not guessing! I think they're always worth a check, though after 6 months if they don't work loose I doubt they would.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
- MrPT
- Lifer
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- Joined: Sun Oct 21, 2012 7:44 pm
- Location: Bucks/Oxon
Torque spec for rear underbody chassis braces?
Well, the "Screws" are definitely single-use. Sheared @ 30Nm!
Just a heads up to anybody who wants to try this. The car is parked up now while I get a replacement bolt/screw.
Just a heads up to anybody who wants to try this. The car is parked up now while I get a replacement bolt/screw.
2008 Z4MC: heavy wheels | crap suspension | skittish rear end | wobbly engine | not enough induction noise | underwhelming turn in | inconsistent braking | lardy battery | chubby steering wheel
2006 Z4 2.5si: gone
2006 Z4 2.5si: gone
- Steve84N
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Torque spec for rear underbody chassis braces?
Almost certainly been off and overtightened before as I've had mine off at least once with no problem.
C63 AMG Estate 6208cc
- GuidoK
- Lifer
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Torque spec for rear underbody chassis braces?
^with mine at least 20 times
But they are stretch bolts and the more you use them the stiffer they get. So be sure not to use that 90deg if you have used them multiple times.
I do it mostly by feeling, but its usually around 30-45deg
Maybe I'll change all underside bolts sometime.
But if it shears at 30Nm, something is wrong.
But they are stretch bolts and the more you use them the stiffer they get. So be sure not to use that 90deg if you have used them multiple times.
I do it mostly by feeling, but its usually around 30-45deg
Maybe I'll change all underside bolts sometime.
But if it shears at 30Nm, something is wrong.
Z4 3.0i | ESS TS2+ | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | fully polybushed | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers | Sachs Race Engineering clutch
- MrPT
- Lifer
- Posts: 4746
- Joined: Sun Oct 21, 2012 7:44 pm
- Location: Bucks/Oxon
Torque spec for rear underbody chassis braces?
Ok, cheers fellas. That’s actually reassuring - probably should have lefty loosey’d before I righty tightey’d.
2008 Z4MC: heavy wheels | crap suspension | skittish rear end | wobbly engine | not enough induction noise | underwhelming turn in | inconsistent braking | lardy battery | chubby steering wheel
2006 Z4 2.5si: gone
2006 Z4 2.5si: gone