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I've not had a bearing cap crack but I did have one rear cap that had a
void in the casting. I would never have known had I not drilled the
extra oil relief holes recommended for the split seal. Unfortunately the
back side of the void broke away at some point creating an easy exit for
engine oil into the tranny case.
Bob Kramer
On Sun, Feb 18, 2024 at 9:05=E2=80=AFAM Philip Gott via Fot <fot@autox.team=
.net>
wrote:
> We had a rear main on a wet sleeve engine crack. It was discovered by
> routine magna fluxing at our machine shop. Bearing looked normal.
> Fortunately we have more caps than engines and found an orphan that fit
> close enough to machine to fit.
> Phil Gott
>
> Sent from my iPhone
>
> On Feb 18, 2024, at 9:34=E2=80=AFAM, JS Performance Motoring, LLC via Fot=
<
> fot@autox.team.net> wrote:
>
> =EF=BB=BF
> Hi Mike,
>
> I had the same issue recently on a street TR6 engine. It was a tired, bu=
t
> running engine.
>
> We sorted through a whole box of caps before finding one that was close
> enough to be cut/ line honed. That's been my experience anytime I've had
> to replace a cap, there seems to be a ton of variation from block to bloc=
k.
>
> Jason Sukey
> JS Performance Motoring, LLC
> 440.984.7720
> jason@jsperformancemotoring.com
> https://www.facebook.com/JSPerformanceMotoring/
>
>
> On Sun, Feb 18, 2024 at 8:50=E2=80=AFAM Michael Deweerd via Fot <
> fot@autox.team.net> wrote:
>
>> WE tore down the TR4engine yesterday to check the bearing wear and give
>> it a once over before the new race season starts. Everything looked grea=
t
>> till I removed the front main bearing cap. Is this a common fault? Has
>> anyone had this before and what would cause the main cap to break? It's
>> not a fresh crack so I was racing this way.....time to buy a lotto ticke=
t?
>> Dragged a spare engine out from the engine shed and will send it to the
>> machine shop on Monday.
>> I checked a few other mains and nothing I have lines up close enough to
>> line hone ...also a Triumph thing?
>> <image.png>
>>
>> --Cheers!!!
>> *Mike Deweerd*
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
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>> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>=
:
>> http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.co=
m
>>
>>
>> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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<div dir=3D"ltr">I've not had a bearing cap crack but I did have one re=
ar cap that had a void in the casting. I would never have=C2=A0known had I =
not drilled the extra=C2=A0oil relief holes recommended for the split seal.=
Unfortunately the back side of the void broke away at some point creating =
an easy exit for engine oil into the tranny case.=C2=A0<div><br clear=3D"al=
l"><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_=
signature"><div dir=3D"ltr">Bob Kramer</div></div></div><br></div></div><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, F=
eb 18, 2024 at 9:05=E2=80=AFAM Philip Gott via Fot <<a href=3D"mailto:fo=
t@autox.team.net">fot@autox.team.net</a>> wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">We had a rear main on=
a wet sleeve engine crack. It was discovered by routine magna fluxing at o=
ur machine shop.=C2=A0 Bearing looked normal. Fortunately we have more caps=
than engines and found an orphan that fit close enough to machine to fit.<=
div>Phil Gott<br><div><br id=3D"m_503277872896790748lineBreakAtBeginningOfS=
ignature"><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><b=
lockquote type=3D"cite">On Feb 18, 2024, at 9:34=E2=80=AFAM, JS Performance=
Motoring, LLC via Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"=
_blank">fot@autox.team.net</a>> wrote:<br><br></blockquote></div><blockq=
uote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr">Hi Mike,<div>=
<br></div><div>I had the same issue recently on a street TR6 engine.=C2=A0 =
It was a tired, but running engine.=C2=A0</div><div><br></div><div>We sorte=
d through a whole box of caps before finding one that was close enough to b=
e cut/ line honed.=C2=A0 That's been my experience anytime I've had=
to replace a cap, there seems to be a ton of variation from block to block=
.</div><div><br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail_signatur=
e"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D=
"ltr"><div dir=3D"ltr"><div>Jason Sukey</div><div><span></span><span></span=
>JS Performance Motoring, LLC<br></div><div>440.984.7720</div><div><a href=
=3D"mailto:jason@jsperformancemotoring.com"; target=3D"_blank">jason@jsperfo=
rmancemotoring.com</a><br></div><div><a href=3D"https://www.facebook.com/JS=
PerformanceMotoring/" target=3D"_blank">https://www.facebook.com/JSPerforma=
nceMotoring/</a><br></div></div></div></div></div></div></div></div></div><=
/div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Sun, Feb 18, 2024 at 8:50=E2=80=AFAM Michael Deweerd via=
Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.=
team.net</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-le=
ft:1ex"><div dir=3D"ltr">WE tore down the TR4engine=C2=A0yesterday=C2=A0to =
check the bearing wear and give it a once over before the new race season=
=C2=A0starts. Everything looked great till I removed the front main bearing=
=C2=A0cap. Is this a common fault? Has anyone had this before and what woul=
d cause the main cap to break?=C2=A0 It's not a fresh crack so I was ra=
cing this way.....time to buy a lotto ticket?=C2=A0 Dragged=C2=A0a spare en=
gine out from the engine shed and will send it to the machine shop on Monda=
y.=C2=A0<div>I checked a few other mains and nothing I have lines up close =
enough to line hone ...also a Triumph thing?=C2=A0<br clear=3D"all"><div><d=
iv><image.png></div><br></div><span class=3D"gmail_signature_prefix">=
--Cheers!!!</span><br><div dir=3D"ltr" class=3D"gmail_signature"><div dir=
=3D"ltr"><i><font face=3D"comic sans ms, sans-serif">Mike Deweerd</font></i=
></div></div></div></div>
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/a><br>
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<br>
</blockquote></div>
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</blockquote></div>
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