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Machining Nose Cone for Mainshaft Bearing Retainer
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VW&MGman
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PostPosted: Sat Dec 06, 2025 12:33 pm    Post subject: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

Hi All,

When installing a mainshaft bearing retainer in a type 1 transmission are you removing ~.040" (1mm) from the nose cone?

https://dunebuggywarehouse.com/cdn/shop/files/imag...1686680906

Thanks
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Dougy Dee
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PostPosted: Sat Dec 06, 2025 2:56 pm    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

No. Back out the studs one turn.
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Casting Timmy
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PostPosted: Sun Dec 07, 2025 4:59 pm    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

Some do and some don't....I like the Bruce plate as it's a simpler installation for me, or maybe a more elegant solution in my mind.

I would say the plates work as well as the bolts surprisingly, just prefer the bolt on style retainers over the plates. (Don't like the silicone or sealant method as oppsoed to just using a gasket.)
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volky1970
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PostPosted: Mon Dec 08, 2025 7:41 am    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

VW&MGman wrote:
Hi All,

When installing a mainshaft bearing retainer in a type 1 transmission are you removing ~.040" (1mm) from the nose cone?

https://dunebuggywarehouse.com/cdn/shop/files/imag...1686680906

Thanks


I installed one last December(2024) without removing the .040" and no problems so far. Just backed out the bolts a bit.
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BFB
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PostPosted: Mon Dec 08, 2025 11:47 am    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

I just installed one the other week and didnt have to back the studs out, studs just barely protrude past the ends of the nuts. so plenty enough
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tpinthepack
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PostPosted: Tue Dec 09, 2025 3:22 am    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

If you don't machine the nose cone, does it put too much stress on the rear rubber mounts, maybe causing them to break sooner? I have never used one of these retainers, but I like the idea.
Tony
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mikedjames
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PostPosted: Tue Dec 09, 2025 12:53 pm    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

The gearbox builder I used, Bears Motorsport, over here in the UK, fits the plate but uses sealant rather than gaskets either side of the plate, he does not machine the gearbox or nose cone.
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BFB
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PostPosted: Tue Dec 09, 2025 2:50 pm    Post subject: Re: Machining Nose Cone for Mainshaft Bearing Retainer Reply with quote

from what I read , not machining the nosecone just moves the nosecone 1mm forward which "moves" your transaxle & engine 1 mm back. mines in a Baja with solid mounts and no tins, so who gives shit about 1mm
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