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Re: [Fot] Cam Bearings expansion

To: 'Scott Janzen' <sjanzen@me.com>
Subject: Re: [Fot] Cam Bearings expansion
From: Diesel Performance Parts - Info via Fot <fot@autox.team.net>
Date: Tue, 6 Jan 2015 07:11:20 -0600
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Cc: "'fot@autox.team.net'" <fot@autox.team.net>
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Delivered-to: fot@autox.team.net
References: <775BAF52-B61C-4DA5-B7E0-DB2F6A0D34BA@me.com>
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Thread-topic: [Fot] Cam Bearings expansion
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Scott,

I doubt if they can straighten the cam they are usually too brittle as comp=
ared to a crankshaft etc.
The old timers used to have a shaving tool for the poured babbit  bearing e=
ngine of days long gone. You could use one of those to "trim" a little off.

I would pull the cam bearings double check the cam bores for alignment, and=
 diameter. If they are OK then make sure the cam bearings are all consisten=
t in thickness.  If they are then it's the cam, it is either oversize or un=
dersize on the nearing journals or bent.

Mark Craig
Diesel Performance Parts, INC.
411 Allied Drive
Nashville, TN 37211
866-455-7788 Phone
615-834-9923 Fax

www.dieselperformanceparts.com
From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of Scott Janzen via=
 Fot
Sent: Monday, January 05, 2015 8:41 PM
To: 'Friends of Triumph' Triumph
Subject: [Fot] Cam Bearings expansion

I've got a bit of cam bind in a new cam I'm installing in the GT6.  It appe=
ars to be a combination of slight run-out (i.e., the cam is slightly bent, =
1/1000 of runout in the middle), journal size right at the factory maximum =
spec, and installed bearing I.D. that is at or below the factory minimum I.=
D.

It's also possible that the block is not bored perfectly straight as the bi=
nding is not consistent around the rotation, but another cam I have, with j=
ournal diameters 5/10,000 smaller, turns freely.  I have not checked that c=
am for run-out.

Question is, is there a tool to "expand" the bearings into the block and po=
ssibly gain a bit of clearance?  I'm told the factory manual for one of tho=
se Octagon cars calls for such a tool.  I'm using the typical Spitfire bear=
ings.

Next stop is a machine shop with a crank straightening machine to see if th=
ey can use it to straighten a cam.





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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3D"#0563C1=
" vlink=3D"#954F72"><div class=3DWordSection1><p class=3DMsoNormal><span st=
yle=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Sco=
tt,<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0=
pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p>&nbsp;</o:p></span>=
</p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calib=
ri",sans-serif;color:#1F497D'>I doubt if they can straighten the cam they a=
re usually too brittle as compared to a crankshaft etc.<o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri=
",sans-serif;color:#1F497D'>The old timers used to have a shaving tool for =
the poured babbit&nbsp; bearing engine of days long gone. You could use one=
 of those to &#8220;trim&#8221; a little off. &nbsp;<o:p></o:p></span></p><=
p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",s=
ans-serif;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><=
span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F49=
7D'>I would pull the cam bearings double check the cam bores for alignment,=
 and diameter. If they are OK then make sure the cam bearings are all consi=
stent in thickness. &nbsp;If they are then it&#8217;s the cam, it is either=
 oversize or undersize on the nearing journals or bent. <o:p></o:p></span><=
/p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibr=
i",sans-serif;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><p class=3DMs=
oNormal><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;colo=
r:#1F497D'>Mark Craig<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Diesel P=
erformance Parts, INC.<o:p></o:p></span></p><p class=3DMsoNormal><span styl=
e=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D'>411 All=
ied Drive<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-siz=
e:10.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Nashville, TN 37211<=
o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;f=
ont-family:"Arial",sans-serif;color:#1F497D'>866-455-7788 Phone<o:p></o:p><=
/span></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:=
"Arial",sans-serif;color:#1F497D'>615-834-9923 Fax<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial",sans-=
serif;color:#1F497D'>&nbsp;<o:p></o:p></span></p></div><p class=3DMsoNormal=
><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F49=
7D'>www.dieselperformanceparts.com</span><span style=3D'font-size:11.0pt;fo=
nt-family:"Calibri",sans-serif;color:#1F497D'><o:p></o:p></span></p><div><d=
iv style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0i=
n 0in'><p class=3DMsoNormal><b><span style=3D'font-size:11.0pt;font-family:=
"Calibri",sans-serif'>From:</span></b><span style=3D'font-size:11.0pt;font-=
family:"Calibri",sans-serif'> Fot [mailto:fot-bounces@autox.team.net] <b>On=
 Behalf Of </b>Scott Janzen via Fot<br><b>Sent:</b> Monday, January 05, 201=
5 8:41 PM<br><b>To:</b> 'Friends of Triumph' Triumph<br><b>Subject:</b> [Fo=
t] Cam Bearings expansion<o:p></o:p></span></p></div></div><p class=3DMsoNo=
rmal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>I've got a bit of cam bind i=
n a new cam I'm installing in the GT6. &nbsp;It appears to be a combination=
 of slight run-out (i.e., the cam is slightly bent, 1/1000 of runout in the=
 middle), journal size right at the factory maximum spec, and installed bea=
ring I.D. that is at or below the factory minimum I.D.<o:p></o:p></p><div><=
p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>It=
's also possible that the block is not bored perfectly straight as the bind=
ing is not consistent around the rotation, but another cam I have, with jou=
rnal diameters 5/10,000 smaller, turns freely. &nbsp;I have not checked tha=
t cam for run-out.<o:p></o:p></p><div><p class=3DMsoNormal><o:p>&nbsp;</o:p=
></p></div><div><p class=3DMsoNormal>Question is, is there a tool to &quot;=
expand&quot; the bearings into the block and possibly gain a bit of clearan=
ce? &nbsp;I'm told the factory manual for one of those Octagon cars calls f=
or such a tool. &nbsp;I'm using the typical Spitfire bearings.<o:p></o:p></=
p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=
=3DMsoNormal>Next stop is a machine shop with a crank straightening machine=
 to see if they can use it to straighten a cam.<o:p></o:p></p></div><div><p=
 class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal><o:=
p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></di=
v><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div></body><=
/html>=

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