Subject: [Fot] Differential setup

From: don--- via Fot <[email-masked]>
Date: Mon, 12 Nov 2018 11:54:24 -0600

I say go for it, Greg.
What’s the worse that can happen!?!  ;-)
Don

> 
> Message: 1
> Date: Sun, 11 Nov 2018 19:49:07 -0600
> From: Greg Blake <[email-masked]>
> To: Fot <[email-masked]>
> Subject: [Fot] Differential setup
> Message-ID: <[email-masked]>
> Content-Type: text/plain; charset="utf-8"
> 
> Attached are pics of the gear mesh patterns on the drive and coast faces of the ring gear on the diff. These are new gears from Bastuck which are the Oerlikon type. I like the drive side pattern but the coast pattern looks a little high. 
> 
> The pinion is set at 0.715? depth and backlash is at 0.004?
> 
> I have moved the pinion 0.020? deeper in the housing at 0.005? increments and the drive side pattern just moved to the tow side. 
> 
> Should I be worried about the coast side or leave it alone?
> 
> Thanks. 
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> Sent from my iPhone
> 

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From: Greg Blake via Fot <[email-masked]>
Date: Tue, 13 Nov 2018 12:21:44 -0600

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The spreader was released prior to taking these readings.=20

I checked the backlash at 4 locations roughly 90 degrees apart and I am with=
in 0.0005=E2=80=9D so I think the carrier flange is straight enough.=20

I have tried the pinion depth from 0.735=E2=80=9D to where it is in the pict=
ures with 0.020=E2=80=9D shim under the pinion race, at 0.715=E2=80=9D.=20

At 0.735=E2=80=9D (no pinion shim) the drive side pattern was at the toe and=
 the coast side was off of the heel.=20

As I added pinion shim, moving the pinion toward the ring gear, to get to wh=
ere it is now, the drive side pattern has moved toward the center position b=
etween the toe and heel with a little bias toward the toe. I think this is o=
k because as the gear is loaded, the pinion is pulled into the ring gear fur=
ther therefore would tend to center the engagement on the driven side.=20

My concern lies with the coast side. It also moved more central as I added p=
inion shim, but is still more biased toward the heel than I=E2=80=99d like t=
o see.=20

I can=E2=80=99t seem to get the two patterns to align more toward the center=
.=20

For a race car, should I be concerned with this coast side pattern?

Thanks.=20

Greg

Sent from my iPhone

> On Nov 12, 2018, at 9:13 AM, Bob Kramer <[email-masked]> wrote:
>=20
> Is the spreader released? Not sure if that distorts anything but it is dif=
ferent one side to the other. Did you check the runout without the ring gear=
 attached?=20
> I would worry more about the driven side and raise the pinion depth to mov=
e that pattern to the middle,
>=20
>=20
> Bob Kramer
>=20
>=20
>> On Sun, Nov 11, 2018 at 8:10 PM Greg Blake via Fot <[email-masked]> w=
rote:
>> Attached are pics of the gear mesh patterns on the drive and coast faces o=
f the ring gear on the diff. These are new gears from Bastuck which are the O=
erlikon type. I like the drive side pattern but the coast pattern looks a li=
ttle high.=20
>>=20
>> The pinion is set at 0.715=E2=80=9D depth and backlash is at 0.004=E2=80=9D=

>>=20
>> I have moved the pinion 0.020=E2=80=9D deeper in the housing at 0.005=E2=80=
=9D increments and the drive side pattern just moved to the tow side.=20
>>=20
>>=20
>> Thanks.=20
>>=20
>> Sent from my iPhone_______________________________________________
>> [email-masked]
>>=20
>>=20
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rkramer56@g=
mail.com
>>=20
>>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>The spreader was released prior to tak=
ing these readings.&nbsp;</div><div><br></div>I checked the backlash at 4 lo=
cations roughly 90 degrees apart and I am within 0.0005=E2=80=9D so I think t=
he carrier flange is straight enough.&nbsp;<div><br></div><div>I have tried t=
he pinion depth from 0.735=E2=80=9D to where it is in the pictures with 0.02=
0=E2=80=9D shim under the pinion race, at 0.715=E2=80=9D.&nbsp;</div><div><b=
r></div><div>At 0.735=E2=80=9D (no pinion shim) the drive side pattern was a=
t the toe and the coast side was off of the heel.&nbsp;</div><div><br></div>=
<div>As I added pinion shim, moving the pinion toward the ring gear, to get t=
o where it is now, the drive side pattern has moved toward the center positi=
on between the toe and heel with a little bias toward the toe. I think this i=
s ok because as the gear is loaded, the pinion is pulled into the ring gear f=
urther therefore would tend to center the engagement on the driven side.&nbs=
p;</div><div><br></div><div>My concern lies with the coast side. It also mov=
ed more central as I added pinion shim, but is still more biased toward the h=
eel than I=E2=80=99d like to see.&nbsp;</div><div><br></div><div>I can=E2=80=
=99t seem to get the two patterns to align more toward the center.&nbsp;</di=
v><div><br></div><div>For a race car, should I be concerned with this coast s=
ide pattern?</div><div><br></div><div>Thanks.&nbsp;</div><div><br></div><div=
>Greg<br><br><div id=3D"AppleMailSignature" dir=3D"ltr">Sent from my iPhone<=
/div><div dir=3D"ltr"><br>On Nov 12, 2018, at 9:13 AM, Bob Kramer &lt;<a hre=
f=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br><br><=
/div><blockquote type=3D"cite"><div dir=3D"ltr"><div dir=3D"ltr">Is the spre=
ader released? Not sure if that distorts anything but it is different one si=
de to the other. Did you check the runout without the ring gear attached?&nb=
sp;<div>I would worry more about the driven side and raise the pinion depth t=
o move that pattern to the middle,<div><br></div><div><br clear=3D"all"><div=
><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signatur=
e"><div dir=3D"ltr">Bob Kramer</div></div></div><br></div></div></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr">On Sun, Nov 11, 2018 at 8:10 PM Gr=
eg Blake via Fot &lt;<a href=3D"mailto:[email-masked]">[email-masked]=
t</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Attached are pics of=
 the gear mesh patterns on the drive and coast faces of the ring gear on the=
 diff. These are new gears from Bastuck which are the Oerlikon type. I like t=
he drive side pattern but the coast pattern looks a little high. <br>
<br>
The pinion is set at 0.715=E2=80=9D depth and backlash is at 0.004=E2=80=9D<=
br>
<br>
I have moved the pinion 0.020=E2=80=9D deeper in the housing at 0.005=E2=80=9D=
 increments and the drive side pattern just moved to the tow side. <br>
<br>
Should I be worried about the coast side or leave it alone?<br>
<br>
Thanks. <br>
<br>
Sent from my iPhone_______________________________________________<br>
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</div></blockquote></div></body></html>=

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