GLS Class (X166) Produced from 2016 to 2019

motor mounts replacement 450

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Old Jan 20, 2026 | 08:01 PM
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2017 GLS 450,Bmw Z4 35i
motor mounts replacement 450

preparing to do motor mounts soon,any good tips and tricks?
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Old Feb 26, 2026 | 06:31 PM
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here is what wis says start from the bottom,one youtube video(channel JustinHiFi) says remove alternator and ac compressor,since i have to tackle the fuel tank to replace the filter i will have to go factory route





Last edited by serb; Feb 26, 2026 at 06:33 PM.
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Old Apr 13, 2026 | 01:36 PM
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after around 12 hours of removing the cats new mounts are in,woohoo,now another 8-10 hours to assemble it back,
hardest part of this job are heat shields above the motor mounts held by small e8 bolts,
they are deep inside,
you cant see sxit and there is very little space,
any angle you try you doesnt work but after switching to 8mm hex socket and sticking my whole arm inside i took it off,
now putting it back oh boy its gonna be exicitng,
old mounts are significantly shorter than new ones,
just this for today ill write whole diy instructions later







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Old Apr 17, 2026 | 04:35 PM
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installing back small heat shields above the mounts took me 3 hours,good trick to use long bolts without a head like the one you get for wheel installing because its impossible to see anything there and align the heatshield,now onto cats,im still trying to install them back,i tried 5 thousand times back and forth and im finanlly close to finishing
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Old Apr 19, 2026 | 04:19 PM
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finally got it done,
managed to strip a transfer case support plate bolt but i have extractor tool so ill try that,
car drives a lot better now but not perfect so i ordered new hv523 borg warner transfer case chain,its only 100$ and drive shaft is going out anyway to get to the fuel tank,
i replaced engine air filters also and they were dated 2016 lol,
so the key point is you will need a helper to hold the cats aligned while you start the vband clamp,after all the trouble i wish i went ac/alternator route,
you will need to align the pin on the cat pipe with a turbo,center the clamp and start tightening,now the problem is as you try to set the clamp you might move the cat accidentaly so the pin is out of place and then you need to go under the car and align it again,try to support it with a jack so it doesn't move while you tighten clamp,use zip tie to hold the clamp while you try to start the bolt, highly likely you will drop it couple times,basically dont connect hangers before you start the clamp where turbo and cat meet as you will need to wiggle it a bit to seal it perfectly,also noticed i have a transfer case small leak as i removed transmission mount i found few drops of fluid(236.14)

part numbers:

transmission mount:
166-240-09-18

motor mounts:
166-240-59-17
166-240-58-17
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Old Apr 19, 2026 | 04:25 PM
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2017 GLS 450,Bmw Z4 35i










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