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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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" 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> </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 bearing engine of days long gone. You could use one=
of those to “trim” a little off. <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> </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. If they are then it’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> </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'> <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> </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. 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> </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. I have not checked tha=
t cam for run-out.<o:p></o:p></p><div><p class=3DMsoNormal><o:p> </o:p=
></p></div><div><p class=3DMsoNormal>Question is, is there a tool to "=
expand" the bearings into the block and possibly gain a bit of clearan=
ce? I'm told the factory manual for one of those Octagon cars calls f=
or such a tool. I'm using the typical Spitfire bearings.<o:p></o:p></=
p></div><div><p class=3DMsoNormal><o:p> </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> </o:p></p></div><div><p class=3DMsoNormal><o:=
p> </o:p></p></div><div><p class=3DMsoNormal><o:p> </o:p></p></di=
v><div><p class=3DMsoNormal><o:p> </o:p></p></div></div></div></body><=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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