Dumb Question Thread - No Flaming Allowed

[Slideways]

Yup, made sure to properly lubricate the new Hotchkis bushings to prevent any noise Thats why i thought if not the FCAB maybe the endlinks but they were tight as can be too ha. Planning to get under the car this weekend to properly inspect where the noise is coming from, assuming if can replicate it with the front wheels in the air.

Interesting, yeah i did notice they dont run monoball FCAB as well when i was scrolling through their webstore in the past researching roll center correction/bump steer kits. I wonder if its worth seeing if can just buy their offset FCAB without needing to buy the whole kinematics kit. Even if these monoball FCAB just need some grease, reaching the grease nipple is a a PITA with needing to remove the aggregate reinforcement plate :/

If they don't offer those separately, Powerflex has a similar offset bushings for the Z4M. PF poly FCAB bushings have not been great in the past, but maybe they changed the design as they don't look like their old poly bushings that used to fall apart. Bimmerworld is another option, but those are not offset.

The Lemforder rubber bushing from the factory for both the E46 M3 (not offset) and Z4M (offset) are solid rubber, so deflection shouldn't be that bad. Another option if the aftermarket bushings don't work out.

[BigRussia]

It sounds like the grease is new on the Hotchkis poly mounts, so it could be those turner FCABs. A few people have gone back to stock FCABs.

Team Schirmer offers an offset FCAB mount with an insert in their full kinematics kit. They setup dedicated Nurburgring track cars, so there might be a reason why they have not gone monoball in that location.

Yup, made sure to properly lubricate the new Hotchkis bushings to prevent any noise Thats why i thought if not the FCAB maybe the endlinks but they were tight as can be too ha. Planning to get under the car this weekend to properly inspect where the noise is coming from, assuming if can replicate it with the front wheels in the air.

Interesting, yeah i did notice they dont run monoball FCAB as well when i was scrolling through their webstore in the past researching roll center correction/bump steer kits. I wonder if its worth seeing if can just buy their offset FCAB without needing to buy the whole kinematics kit. Even if these monoball FCAB just need some grease, reaching the grease nipple is a a PITA with needing to remove the aggregate reinforcement plate :/

[Slideways]

How do you know it’s time to re-grease monoball FCABs? Hearing creaking from the front end this weekend at Sebring track event during low speed driving when turning the wheel, tapping the brakes, and even when engaging clutch to start rolling out. Can even slightly feel the creaking so has me thinking it must be LCA related. Have Turner monoball FCAB and my indy had supposedly re-greased them when installing new LCAs a year ago..

Only other recent front end install was a Hotchkis fsb but I had made sure the GC endlinks were installed tight to prevent any end-link clanking/play. Iirc i was hearing the creaks slightly even before the fsb install, just more pronounced now after two b2b days at Sebring.

It sounds like the grease is new on the Hotchkis poly mounts, so it could be those turner FCABs. A few people have gone back to stock FCABs.

Team Schirmer offers an offset FCAB mount with an insert in their full kinematics kit. They setup dedicated Nurburgring track cars, so there might be a reason why they have not gone monoball in that location.

[BigRussia]

How do you know it’s time to re-grease monoball FCABs? Hearing creaking from the front end this weekend at Sebring track event during low speed driving when turning the wheel, tapping the brakes, and even when engaging clutch to start rolling out. Can even slightly feel the creaking so has me thinking it must be LCA related. Have Turner monoball FCAB and my indy had supposedly re-greased them when installing new LCAs a year ago..

Only other recent front end install was a Hotchkis fsb but I had made sure the GC endlinks were installed tight to prevent any end-link clanking/play. Iirc i was hearing the creaks slightly even before the fsb install, just more pronounced now after two b2b days at Sebring.

[IamFODI]

I guess it's a vibration damper because that's what BMW calls it. I've always thought the dual mass flywheel was the more effective harmonic balancer in the system.

If it's a damper, that means it works by absorbing vibrations.

A balancer is different; it has a counterweight on it to balance the rotating assembly (and probably a damping element as well).

Without a damper, your engine would make more NVH and not live as long. Without a balancer, your engine would run like a jackhammer and grenade in short order.

Pretty sure the crank pulley and maybe the flywheel in this engine act as dampers but not balancers. The engine is internally balanced. I can't imagine how an I6 would ever need an external balancer.

You might be right about the DMF technically doing more than the crank pulley to absorb vibration, though I'd imagine they absorb different frequencies from different sources, so they're probably complementary more than comparable.

[fattycharged]

How much, if any, play is acceptable on the output of the trans?

*rotational



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[zzyzx85]

Harmonic balancer or vibration damper?

I guess it's a vibration damper because that's what BMW calls it. I've always thought the dual mass flywheel was the more effective harmonic balancer in the system.

[L0okitzRaj]

crank hub doubles as a harmonic balancer. I would start looking to get that replaced.

damn. thats what i was scared of.

thanks for the input.

[IamFODI]

crank hub doubles as a harmonic balancer.

Harmonic balancer or vibration damper?

[Slideways]

Thank you, yep for installation. Found a nice YouTube short demonstrating install for anyone interested
https://youtube.com/shorts/8JBrwvAL8...pp7Xhms9cXSgqO

I remember seeing the procedure done somewhere. Turns out it was Sreten's video of the valve seal on an X5 - skip to 24min

[zzyzx85]

Yall think this is an issue… missing bits on the crank hub.

the orange is where the rubberized coating has come off.

crank hub doubles as a harmonic balancer. I would start looking to get that replaced.

[sbay]

Yes, my guess is they cover the valve keeper locking portion of the valve stem, so the seal can slide over without getting caught or damaged.

Thank you, yep for installation. Found a nice YouTube short demonstrating install for anyone interested

https://youtube.com/shorts/8JBrwvAL8C0?si=PSpp7Xhms9cXSgqO

[Slideways]

Anyone know what the red tubes are used for that come with the valve stem seal kit...I'm guessing they're used for installation?
For reference: https://www.bimmerworld.com/Engine/G...349064457.html

Yes, my guess is they cover the valve keeper locking portion of the valve stem, so the seal can slide over without getting caught or damaged.

[sbay]

Anyone know what the red tubes are used for that come with the valve stem seal kit...I'm guessing they're used for installation?
For reference: https://www.bimmerworld.com/Engine/G...349064457.html

[L0okitzRaj]

Yall think this is an issue… missing bits on the crank hub.

the orange is where the rubberized coating has come off.