The pilot bearing should fit into the end of the crankshaft not the flywheel
so that was not disturbed however the flywheel does help to hold the pilot
bearing from moving towards the transmission as the flywheel captures the
bearing into the crankshaft. It may not be an issue depending upon the
length of the pilot bushing dia on the input shaft. BUT if the pilot bushing
can move out of the crankshaft (because it's no longer being held in by the
flywheel) it could become a problem. A solution would be to cut another
pilot bearing to a length that will hold the inner pilot into the crankshaft
or to have that same machinist make to a spacer to take up the length of the
input shaft diameter thus keeping the bearing in place. It must be kept in
the crankshaft.
JVV
----- Original Message -----
From: "Bob Danielson" <75tr6@tr6.danielsonfamily.org>
To: "Mo and Dave MacKay" <m.d.mackay@sympatico.ca>;
<triumphs@autox.team.net>
Sent: Friday, August 19, 2011 7:45 AM
Subject: Re: [TR] Have I ruined the flywheel on my TR3A?
> Herman would be the best person to ask but it's probably in Breckenridge
> at VTR.
>
> I have the HVDA kit in my TR6 (http://tr6.danielsonfamily.org/5Speed.htm)
> and the pilot bearing fits in the flywheel and the tranny input shaft nose
> fits in the pilot bearing so..... at the very least you probably need a
> new pilot bearing sized to the new flywheel hole.
>
> Bob
>
>
> Bob Danielson
> http://tr6.danielsonfamily.org
> 1975 TR6 with:
> Throttle Body Injection
> Toyota 5 Speed
> Nissan Diff & CVJs
>
>
>
> -----Original Message-----
> From: Mo and Dave MacKay
> Sent: Friday, August 19, 2011 4:26 AM
> To: triumphs@autox.team.net
> Subject: [TR] Have I ruined the flywheel on my TR3A?
>
> Hello:
>
> Im replacing the gearbox in my TR3A with a Toyota W58 transmission, using
> the HVDA conversion kit. The HVDA kit requires that one use a TR6 (Borg &
> Beck) pressure plate instead of the usual TR3A pressure plate. The TR6
> pressure plate doesnt fit into the holes used by the TR3A pressure plate;
> new mounting and dowel holes must be drilled.
>
> I took my old flywheel along with the new pressure plate etc. down to a
> machinist to have him:
> 1) true the flywheel
> 2) drill new holes and mount the new pressure plate to the flywheel
> 3) balance the resulting unit
> Everything went well until step #3.
>
> The centre hole in the flywheel (the one that the gearboxs input shaft
> goes
> through) was too small to fit on the machinists balancing equipment. So
> he
> made it bigger by about a half an inch so that it would fit on his
> machine.
> He then balanced the unit and gave it back to me.
>
> I worry (but dont know) that the flywheels centre hole was originally
> sized to:
> - keep the pilot bearing from sliding out of the crankshaft
> - support the transmissions input shaft
> - provide more material to rest against the clutch plate (the bigger
> hole
> means theres less flywheel surface for the clutch plate to press against)
>
> Has enlarging the centre hole ruined the flywheel? Or is it no big deal
> (as
> the machinist claims)? If it is a problem, and since the flywheels are
> NLA,
> how could I fix this?
>
> I appreciate your advice and suggestions.
>
> Dave MacKay
> 1960 TR3A s/n 68639L
> near Toronto, Canada
>
>
>
> triumphs@autox.team.net
>
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