[Fot] TR4 ARP Flywheel Bolts Question

[Barr, Scott]

<< Don't you guys use steel inserts in those flywheel holes? >>

Nope – I’ve always used them as supplied.  And so long as I remembered to check the clearance for the radius under the head, it’s been fine.  Frankly, I always wondered about why it was OK to torque the flywheel bolts down onto a relatively soft aluminum flywheel, but bad to use a steel washer – which was almost certainly harder.  But I’ve always used Loctite on the flywheel bolts: mostly red, though sometimes blue.

Scott (B.)

From: Scott Janzen [mailto:sjanzen at me.com]
Sent: Monday, June 05, 2017 3:28 PM
To: Barr, Scott <sbarr at McCarty-Law.com>
Cc: timmmurphh at gmail.com; Steve Yott <tr4 at wi.rr.com>; STEPHEN BOROWSKI <biznzman at pacbell.net>; FOT <fot at autox.team.net>
Subject: Re: [Fot] TR4 ARP Flywheel Bolts Question

Don't you guys use steel inserts in those flywheel holes?

Sent from my iPhone

On Jun 5, 2017, at 7:55 AM, Barr, Scott via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:
This is what it looks like if you forget to chamfer the flywheel holes to clear the radius under the head.

<image001.jpg>

From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of timmmurphh--- via Fot
Sent: Sunday, June 04, 2017 5:53 PM
To: 'Steve Yott' <tr4 at wi.rr.com<mailto:tr4 at wi.rr.com>>; 'STEPHEN BOROWSKI' <biznzman at pacbell.net<mailto:biznzman at pacbell.net>>; fot at autox.team.net<mailto:fot at autox.team.net>
Subject: Re: [Fot] TR4 ARP Flywheel Bolts Question

Thanks for the clarification Steve, that makes sense.

Tim


From: Steve Yott [mailto:tr4 at wi.rr.com]
Sent: Sunday, June 4, 2017 4:56 PM
To: timmmurphh at gmail.com<mailto:timmmurphh at gmail.com>; 'STEPHEN BOROWSKI' <biznzman at pacbell.net<mailto:biznzman at pacbell.net>>
Subject: RE: [Fot] TR4 ARP Flywheel Bolts Question

The reason they state to not use washers is they are afraid that the washers used will (1) not be hard enough and will compress under the bolt head and (2) all ARP bolts have very liberal radii between the head and shank.  If there is a tight fitting washer this would be strain on this radius and could break the head.

The 7/16” ARP bolts used on Chevy flywheels is what I fit to TR’6, late Spitfires and modified TR4 cranks.  These bolts come with the special washers to use with them.  I have used a proper washer under the 3/8” ARP bolts many times with no problems using a correct washer.  You can also use an ARP crown wheel bolt for the same purpose and these come with proper washers.

Steve Yott

From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of timmmurphh--- via Fot
Sent: Sunday, June 04, 2017 1:59 PM
To: 'STEPHEN BOROWSKI' <biznzman at pacbell.net<mailto:biznzman at pacbell.net>>; fot at autox.team.net<mailto:fot at autox.team.net>
Subject: Re: [Fot] TR4 ARP Flywheel Bolts Question

FWIW

I just got a set of ARP 206-2802 flywheel bolts from Pegasus for the TR4.  They are for “BMC A series”.  The instruction specifically says, “DO NOT USE ANY WAHERS”, yes, all in caps for emphasis!  They further state that ARP will not be responsible for failures is washers are used.  The instructions also say, “Make sure there is an adequate chamfer under the bolt holes on the flywheel to clear the radius under the head of the bolt.”  Torque is 55 Ft-Lb with specified lubricants on the threads.

I’ve never had that much good luck grinding the ends of bolts and still having it square so as not to start it cocked and runing the female threads.  Maybe it’s just me😊

Tim


From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of STEPHEN BOROWSKI via Fot
Sent: Friday, June 2, 2017 3:28 PM
To: FOT List <fot at autox.team.net<mailto:fot at autox.team.net>>
Subject: [Fot] TR4 ARP Flywheel Bolts Question

Does anyone have experience using the ARP flywheel bolts sold by Moss and others?
I understand that you may have to shorten the bolt or it breaks the rear seal???
Are they supposed to have a washer or not?

Thxs. Steve
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