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Re: [Shop-talk] How to open clearance on a hardened pin?

To: old dirtbeard <dirtbeard@gmail.com> engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-24_10,2024-03-21_02,2023-05-22_02 adultscore=0 phishscore=0 mlxscore=0 suspectscore=0 spamscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2308100000 definitions=main-2403240087
Subject: Re: [Shop-talk] How to open clearance on a hardened pin?
From: Pat Horne <patintexas@icloud.com>
Date: Sun, 24 Mar 2024 08:41:55 -0500
Cc: Shop Talk <shop-talk@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <CAG1pxgYprm6aaRgTJOQRUi05DQqZ4bT5YM7MqtbQ1LTk4NMRZA@mail.gmail.com>
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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">Not knowing anything about this motorcycle,=
 but if the shaft is cylindrical, try putting the shaft in backwards.&nbsp;<=
div><br></div><div>Peace, Pat</div><div><br id=3D"lineBreakAtBeginningOfSign=
ature"><div dir=3D"ltr">Pat Horne&nbsp;<div>We support Habitat for Humanity<=
/div><div><br></div></div><div dir=3D"ltr"><br>On Mar 24, 2024, at 8:33=E2=80=
=AFAM, old dirtbeard &lt;dirtbeard@gmail.com&gt; wrote:<br><br></div><div di=
r=3D"ltr">=EF=BB=BF<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fo=
nt-size:small">I had a '73 MG V7 Sport which had a different swing arm but a=
 similar arrangement.</div><div class=3D"gmail_default" style=3D"font-size:s=
mall"><br></div><div class=3D"gmail_default" style=3D"font-size:small">I wou=
ld think that if they came out easily, they should go back in reasonably&nbs=
p;easily. If not, something is interfering with the refitment.&nbsp;&nbsp;</=
div><div class=3D"gmail_default" style=3D"font-size:small"><br></div><div cl=
ass=3D"gmail_default" style=3D"font-size:small">Perhaps:</div><div class=3D"=
gmail_default" style=3D"font-size:small"><ol><li>inspect the fitment for any=
 scoring or swarth that could be interfering (I am certain that you already d=
id this)</li><li>Swap the left bearing for the right&nbsp;to see if there ar=
e dimensional&nbsp;differences.</li><li>Swap the bearing side you insert fir=
st into the arm&nbsp;</li><li>As mentioned, use a light abrasion like crocus=
 cloth or scotch bright pads to polish up the surfaces of the bearing and th=
e swingarm cylinders</li></ol><div>I know that it is little help, but if the=
y came out without hammering, they should go back without hammering. Somethi=
ng has changed that is causing the interference fitment now and you will nee=
d to determine&nbsp;what has happened/changed during the R&amp;R process.</d=
iv><div><br></div><div>best,</div><div><br></div><div>doug</div></div></div>=
<br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun,=
 Mar 24, 2024 at 3:57=E2=80=AFAM Al Fuller &lt;<a href=3D"mailto:alfuller194=
@gmail.com">alfuller194@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div dir=3D"auto"><div>Well, ok then... BTW, ar=
e the bearings and races not in the diagram you referenced or am I missing s=
omething?</div><div><br></div><div>________________<br>Best Regards,<br>Al Fu=
ller</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gma=
il_attr">On Sat, Mar 23, 2024, 11:23 PM Jim Franklin &lt;<a href=3D"mailto:j=
amesf@groupwbench.org" target=3D"_blank">jamesf@groupwbench.org</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Good thoug=
ht but I should have specified that I tried inserting the pin directly into t=
he bearing race and it exhibited the same issue.&nbsp;<div><br></div><div>ji=
m<br><div><br><blockquote type=3D"cite"><div>On Mar 23, 2024, at 10:14 PM, A=
l Fuller &lt;<a href=3D"mailto:alfuller194@gmail.com"; rel=3D"noreferrer" tar=
get=3D"_blank">alfuller194@gmail.com</a>&gt; wrote:</div><br><div><div dir=3D=
"auto"><div>Jim, I don't know this part/assembly but it seems to me that the=
 original engineering would not have required hammering. Added to that one s=
ide goes in well but not the other, I'm wondering if the bike might have a l=
ittle eccentricity in the fit-up? Is it possible that it was laid down at so=
me point in the past and has a little twist in the assembly?</div><div><br><=
/div><div>________________<br>Best Regards,<br>Al Fuller</div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Mar 23,=
 2024, 10:17 PM Jim Franklin &lt;<a href=3D"mailto:jamesf@groupwbench.org"; r=
el=3D"noreferrer" target=3D"_blank">jamesf@groupwbench.org</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">I'm assembling a Mot=
o Guzzi swingarm which attaches to the back of the gearbox. The gearbox has 2=
 recesses in which live plain roller bearings. The swingarm has threaded hol=
es through which locating pins screw. The tips of the pins are unthreaded an=
d locate into the ID of of the roller bearings. Parts #12 here:<br>
<br>
<a href=3D"https://harpermoto.com/collections/1980-1984-v-50-iii-500-swing-a=
rm" rel=3D"noreferrer noreferrer noreferrer" target=3D"_blank">https://harpe=
rmoto.com/collections/1980-1984-v-50-iii-500-swing-arm</a><br>
<br>
The pins are known for being stuck yet mine came out easily, probably becaus=
e the inner race was able to rest against the swingarm while the pin was bei=
ng pulled out. Assembly is another matter. The bearings don't bottom out in t=
heir recess so the inner race has nothing supporting it when I screw the pin=
s into the swingarm, and one pin is not sliding into the inner race (the oth=
er pin fits into both races as it should). I don't want to hammer on it and d=
ent the races. I've sanded it with some 400 grit but I'm pretty sure the pin=
s are hardened and so I haven't made any progress.<br>
<br>
Any thoughts on how to get this pin to fit in the bearing? Freezing it is no=
t a great option because of the time it takes to get things installed, plus I=
'll need to do clearance adjustments. <br>
<br>
thanks,<br>
jim<br>
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