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On later SUs with plastic caps a carb backfire will send the rod up through
the cap if too heavy an oil is used.
M
On Tue., Jun. 15, 2021, 6:42 p.m. Harold Manifold via Healeys, <
healeys@autox.team.net> wrote:
> I checked two versions of the Healy Workshop Manual:
>
>
>
> Issue 2 =E2=80=93 20W/20 or 20W/30
>
> Issue 9 =E2=80=93 10W/30 or 10W/40
>
>
>
> Both manuals have this statement =E2=80=9CIn no circumstances should a
> heavy-bodied lubricant be used=E2=80=9D. The oil is to act as a damper an=
d reduce
> the pistons in the carburetor from fluttering. Once the temperature gets
> above about 40 deg C the viscosity is very similar for all of the
> lubricants mentioned. Note 75W/90 gear oil is very close to 15W/40 motor
> oil. Straight 90 is probably not a good choice as it will be heavy-bodied
> at lower temperatures.
>
>
>
> The manuals suggest the lightest oil that will control piston flutter is
> the right one.
>
>
>
> Harold
>
>
>
> *From: *David Nock BCS via Healeys <healeys@autox.team.net>
> *Sent: *Tuesday, June 15, 2021 2:20 PM
> *To: *Michael MacLean <springer.mike51@gmail.com>; Ahealey help
> <healeys@autox.team.net>
> *Subject: *Re: [Healeys] Dashpot OIl Wt
>
>
>
> We have used 20 / 50 straight from an oil can on the bench for 40 years
> and never had a problem.
>
>
>
>
>
> David Nock
> British Car Specialists
> 209-948-8767
> www.britishcarspecialists.com
>
>
>
>
>
> *From:* Michael MacLean via Healeys
>
> *Sent:* Tuesday, June 15, 2021 1:18 PM
>
> *To:* Ahealey help
>
> *Subject:* [Healeys] Dashpot OIl Wt
>
>
>
> I watched a recent John Twist YouTube video today on fitting H type SU
> carbs to a T type MG. In the video he says to use 90 wt gear oil in the
> dashpot. He also said the lighter oils and ATF that so many people
> recommend contribute to the early wear and tear on the carb. Anyone else
> using this weight oil in the carb? All my life I have been putting 20 wt
> oil in the dashpot.
>
> Mike MacLean
>
> _______________________________________________
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>
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>
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>
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<div dir=3D"auto">On later SUs with plastic caps a carb backfire will send =
the rod up through the cap if too heavy an oil is used.<div dir=3D"auto"><b=
r></div><div dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"gmail_attr">On Tue., Jun. 15, 2021, 6:42 p.m. Harold M=
anifold via Healeys, <<a href=3D"mailto:healeys@autox.team.net";>healeys@=
autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
lang=3D"EN-US" link=3D"blue" vlink=3D"#954F72" style=3D"word-wrap:break-wor=
d"><div class=3D"m_5096095987976428959WordSection1"><p class=3D"MsoNormal">=
I checked two versions of the Healy Workshop Manual:</p><p class=3D"MsoNorm=
al"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Issue 2 =E2=80=93 20W/20=
or 20W/30</p><p class=3D"MsoNormal">Issue 9 =E2=80=93 10W/30 or 10W/40</p>=
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Both =
manuals have this statement =E2=80=9CIn no circumstances should a heavy-bod=
ied lubricant be used=E2=80=9D. The oil is to act as a damper and reduce th=
e pistons in the carburetor from fluttering. Once the temperature gets abov=
e about 40 deg C the viscosity is very similar for all of the lubricants me=
ntioned. Note 75W/90 gear oil is very close to 15W/40 motor oil. Straight 9=
0 is probably not a good choice as it will be heavy-bodied at lower tempera=
tures.</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNor=
mal">The manuals suggest the lightest oil that will control piston flutter =
is the right one.</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p clas=
s=3D"MsoNormal">Harold</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><d=
iv style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0i=
n 0in"><p class=3D"MsoNormal" style=3D"border:none;padding:0in"><b>From: </=
b><a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"norefe=
rrer">David Nock BCS via Healeys</a><br><b>Sent: </b>Tuesday, June 15, 2021=
2:20 PM<br><b>To: </b><a href=3D"mailto:springer.mike51@gmail.com"; target=
=3D"_blank" rel=3D"noreferrer">Michael MacLean</a>; <a href=3D"mailto:heale=
ys@autox.team.net" target=3D"_blank" rel=3D"noreferrer">Ahealey help</a><br=
><b>Subject: </b>Re: [Healeys] Dashpot OIl Wt</p></div><p class=3D"MsoNorma=
l"><u></u>=C2=A0<u></u></p><div><div><div><p class=3D"MsoNormal"><span styl=
e=3D"font-size:12.0pt;font-family:"Century",serif;color:black">We=
have used 20 / 50 straight from an oil can on the bench for 40 years and n=
ever had a problem.<u></u><u></u></span></p></div><div><p class=3D"MsoNorma=
l"><span style=3D"font-size:12.0pt;font-family:"Century",serif;co=
lor:black">=C2=A0<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"=
><span style=3D"font-size:12.0pt;font-family:"Century",serif;colo=
r:black">=C2=A0<u></u><u></u></span></p></div><div><div><p class=3D"MsoNorm=
al"><span style=3D"font-size:12.0pt;font-family:"Century",serif;c=
olor:black">David Nock<br>British Car Specialists<br>209-948-8767<br><a hre=
f=3D"http://www.britishcarspecialists.com"; target=3D"_blank" rel=3D"norefer=
rer">www.britishcarspecialists.com</a><u></u><u></u></span></p></div><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:"Century&=
quot;,serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><div><di=
v><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"=
Tahoma",sans-serif;color:black">=C2=A0<u></u><u></u></span></p></div><=
div><div><p class=3D"MsoNormal" style=3D"background:whitesmoke"><b><span st=
yle=3D"font-size:10.0pt;font-family:"Tahoma",sans-serif;color:bla=
ck">From:</span></b><span style=3D"font-size:10.0pt;font-family:"Tahom=
a",sans-serif;color:black"> Michael MacLean via Healeys <u></u><u></u>=
</span></p></div><div><p class=3D"MsoNormal" style=3D"background:whitesmoke=
"><b><span style=3D"font-size:10.0pt;font-family:"Tahoma",sans-se=
rif;color:black">Sent:</span></b><span style=3D"font-size:10.0pt;font-famil=
y:"Tahoma",sans-serif;color:black"> Tuesday, June 15, 2021 1:18 P=
M<u></u><u></u></span></p></div><div><p class=3D"MsoNormal" style=3D"backgr=
ound:whitesmoke"><b><span style=3D"font-size:10.0pt;font-family:"Tahom=
a",sans-serif;color:black">To:</span></b><span style=3D"font-size:10.0=
pt;font-family:"Tahoma",sans-serif;color:black"> Ahealey help <u>=
</u><u></u></span></p></div><div><p class=3D"MsoNormal" style=3D"background=
:whitesmoke"><b><span style=3D"font-size:10.0pt;font-family:"Tahoma&qu=
ot;,sans-serif;color:black">Subject:</span></b><span style=3D"font-size:10.=
0pt;font-family:"Tahoma",sans-serif;color:black"> [Healeys] Dashp=
ot OIl Wt<u></u><u></u></span></p></div></div></div><div><p class=3D"MsoNor=
mal"><span style=3D"font-size:12.0pt;color:black">=C2=A0</span><span style=
=3D"font-size:12.0pt;color:black"><u></u><u></u></span></p></div></div><div=
><div><div id=3D"m_5096095987976428959gmail-:1hh"><div><div><p class=3D"Mso=
Normal"><span style=3D"font-size:12.0pt;color:black">I watched a recent Joh=
n Twist YouTube video today on fitting H type SU carbs to a T type MG.=C2=
=A0 In the video he says to use 90 wt gear oil in the dashpot.=C2=A0 He als=
o said the lighter oils and ATF that so many people recommend contribute to=
the early wear and tear on the carb.=C2=A0 Anyone else using this weight o=
il in the carb?=C2=A0 All my life I have been putting 20 wt oil in the dash=
pot.=C2=A0 <u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span=
style=3D"font-size:12.0pt;color:black">Mike MacLean<u></u><u></u></span></=
p></div></div></div></div><p class=3D"MsoNormal"><span style=3D"font-size:1=
2.0pt;color:black"><img border=3D"0" width=3D"708" height=3D"1" style=3D"wi=
dth:7.375in;height:.0104in" id=3D"m_5096095987976428959Horizontal_x0020_Lin=
e_x0020_1" src=3D"cid:image002.png@01D761F5.4B97CB80"></span><span style=3D=
"font-size:12.0pt;color:black"><u></u><u></u></span></p></div></div></div><=
p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-si=
ze:12.0pt;color:black">_______________________________________________<br>S=
upport Team.Net <a href=3D"http://www.team.net/donate.html"; target=3D"_blan=
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