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Yella terra flywheel issues

Started by _Donyboom_ , Jun 08 2020 07:09 PM

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8 replies to this topic

#1 _Donyboom_

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Posted 08 June 2020 - 07:09 PM

Just wondering if anyone else is running a YT9904L and has run into an issue with the counter bore depth on the pressure plate bolt holes. My bolts bottom out on the hole before they tighten the plate.. the counter bore on the flywheel is only 3.5mm and the shank on the bolt is like 9mm long.

Cheers

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#2 S pack

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Name:Dave
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Posted 08 June 2020 - 07:20 PM

Will check the counter bore depth on an OEM red 6 flywheel for you a little later this evening.

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#3 _Donyboom_

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Posted 08 June 2020 - 07:52 PM

Will check the counter bore depth on an OEM red 6 flywheel for you a little later this evening.

Sorry I should have mentioned that the standard one has a counter bore depth of somewhere around 9mm. Why would yt change this? Or am I supposed to use different bolts?

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#4 S pack

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Name:Dave
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Posted 08 June 2020 - 07:58 PM

You would be best contact Yella Terra and inform them of your situation.

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#5 _Donyboom_

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Posted 08 June 2020 - 08:00 PM

Yeah will do first thing. Cheers

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#6 76lxhatch

That was easy!

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Posted 08 June 2020 - 08:16 PM

Wouldn't be surprised if they expect you to use aftermarket ARP bolts or something like that. The V8 flywheels are basically just Chevy ones with Holden offset bolt pattern, when you compare weights the lightweight one is slightly heavier than standard as all the comparisons are for different engines, I'd say they've just taken parts off the shelf to suit rather than being ground-up made for the application.

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#7 liswar2

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Posted 09 June 2020 - 12:05 AM

You could try auto fly wheel bolts as they are about 3-5 mm shorter than manual ones ?

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#8 _Donyboom_

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Posted 09 June 2020 - 12:39 PM

So as it turns out, I have discovered an error in the flywheel machining and they will be changing them from now on. No worries folks! thanks for the input!