[Fot] Mystery Or common fault

[Bob Kramer]

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 AM Philip Gott via Fot <fot at 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 AM, JS Performance Motoring, LLC via Fot <
> fot at autox.team.net> wrote:
>
> 
> Hi Mike,
>
> I had the same issue recently on a street TR6 engine.  It was a tired, but
> 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 block.
>
> Jason Sukey
> JS Performance Motoring, LLC
> 440.984.7720
> jason at jsperformancemotoring.com
> https://www.facebook.com/JSPerformanceMotoring/
>
>
> On Sun, Feb 18, 2024 at 8:50 AM Michael Deweerd via Fot <
> fot at 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 great
>> 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 ticket?
>> 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*
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