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Hi Steve,
The issue you described with your neighbor's 1275 engine may be related to
a similar problem I've encountered.
I know of a recently rebuilt engine that experienced comparable excessive
oil blow-by. The cause, in that case, was a poorly refurbished and refitted
rocker shaft and bushings. Without adequate restriction between the rocker
shaft and the bushings to regulate the oil flow, it resulted in an
excessive amount of oil being pumped to the top of the engine.
I hope this provides another avenue for investigation.
Regards,
Harold
On Sat, Nov 15, 2025 at 1:12=E2=80=AFPM Michael Salter <michael.salter@gmai=
l.com>
wrote:
> Hi Steve, what you describe sounds to me like excessive blow-by.
> I would recommend a compression test before going too much further.
>
> M
>
>
> ------------------------------
> *From:* Healeys <healeys-bounces@autox.team.net> on behalf of Steven
> Kingsbury via Healeys <healeys@autox.team.net>
> *Sent:* Saturday, November 15, 2025 3:33:19 PM
> *To:* Healey Mail List <healeys@autox.team.net>
> *Subject:* [Healeys] Sprite question for my neighbor
>
> My neighbor bought a bugeye that had a 1275 engine put in it. It runs
> well, but blows oil like crazy out of the oil cap on the valve cover. It
> does not have a timing cover ventilation valve, but a fitting was made to
> fit onto where the old fuel pump fit on the side of the crankcase/block.
> When he hooked the hose from that fitting to the carbs, oil was no longer
> being blown out, but oil was then being sucked into the carbs and he was
> burning oil like crazy.
>
> It seems the pressure in the crankcase is so great it is pushing oil up
> the push rods into the rocker assembly, out the filler cap and all over t=
he
> engine. I'm not familiar with the 1275 and have no ideas on how to vent t=
he
> pressure in the crankcase. Can anyone of you guys point me to a possible
> solution? Thanks in advance for the advice.
> Steven Kingsbury
> BN1
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<div dir=3D"ltr"><div>Hi Steve,</div><div><br></div><div>The issue you desc=
ribed with your neighbor's 1275 engine may be related to a similar prob=
lem I've encountered.</div><div><br></div><div>I know of a recently reb=
uilt engine that experienced comparable excessive oil blow-by. The cause, i=
n that case, was a poorly refurbished and refitted rocker shaft and bushing=
s. Without adequate restriction between the rocker shaft and the bushings t=
o regulate the oil flow, it resulted in an excessive amount of oil being pu=
mped to the top of the engine.</div><div><br></div><div>I hope this provide=
s another avenue for investigation.</div><div><br></div><div>Regards,</div>=
<div>Harold</div></div><br><div class=3D"gmail_quote gmail_quote_container"=
><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Nov 15, 2025 at 1:12=E2=80=
=AFPM Michael Salter <<a href=3D"mailto:michael.salter@gmail.com";>michae=
l.salter@gmail.com</a>> wrote:<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>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt;color:rgb(33,33,33)" dir=3D"auto">
Hi Steve, what you describe sounds to me like excessive blow-by.=C2=A0</div=
>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt;color:rgb(33,33,33)" dir=3D"auto">
I would recommend a compression test before going too much further.=C2=A0</=
div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt;color:rgb(33,33,33)" dir=3D"auto">
<br>
</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt;color:rgb(33,33,33)" dir=3D"auto">
M</div>
<div id=3D"m_8735642865022924963ms-outlook-mobile-body-separator-line" styl=
e=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helve=
tica,sans-serif;font-size:12pt">
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt">
<br>
</div>
</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt" id=3D"m_8735642865022924963ms-outl=
ook-mobile-signature">
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt">
<br>
</div>
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_8735642865022924963divRplyFwdMsg" dir=3D"ltr"><font face=3D"Ca=
libri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b> =
Healeys <<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_bl=
ank">healeys-bounces@autox.team.net</a>> on behalf of Steven Kingsbury v=
ia Healeys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">=
healeys@autox.team.net</a>><br>
<b>Sent:</b> Saturday, November 15, 2025 3:33:19 PM<br>
<b>To:</b> Healey Mail List <<a href=3D"mailto:healeys@autox.team.net"; t=
arget=3D"_blank">healeys@autox.team.net</a>><br>
<b>Subject:</b> [Healeys] Sprite question for my neighbor</font>
<div>=C2=A0</div>
</div>
<div>
<div>My neighbor bought a bugeye that had a 1275 engine put in it. It runs =
well, but blows oil like crazy out of the oil cap on the valve cover. It do=
es not have a timing cover ventilation valve, but a fitting was made to fit=
onto where the old fuel pump fit
on the side of the crankcase/block. When he hooked the hose from that fitt=
ing to the carbs, oil was no longer being blown out, but oil was then being=
sucked into the carbs and he was burning oil like crazy.</div>
<div><br>
</div>
<div>It seems the pressure in the crankcase is so great it is pushing oil u=
p the push rods into the rocker assembly, out the filler cap and all over t=
he engine. I'm not familiar with the 1275 and have no ideas on how to v=
ent the pressure in the crankcase. Can
anyone of you guys point me to a possible solution? Thanks in advance for =
the advice.</div>
<div>Steven Kingsbury</div>
<div>BN1</div>
</div>
</div>
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</blockquote></div>
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