Pulled the engine apart on the weekend and discovered an incorrectly fitted piston! one piston is fitted backwards



i should be able to just turn it around on the conrod cant i?

Jason

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'66 BRG Morris Mini Deluxe 60HP ATW

Yeah just turn it around on the conrod.
It's a wonder the motor didn't rattle, as the gudgeon pins in these pistons are offset to one side.
I know Fiats rattle when you get 'em the wrong way round.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Are you sure it is only one piston the wrong way around and not three?

Do the front markings on the imp piston point to the front of the engine or the front of the car?

My bro is into Imps (me too, a bit). We'd have around 6 motors at the farm, including a couple of GTs.

The `front' of the engine is the fan pulley end. It ain't no Renault...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

are the gudgeons in these a press fit or can i just remove the circlip and swap it over without a press?

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'66 BRG Morris Mini Deluxe 60HP ATW

Hason,,, once you have all the pistons/rods out of then gine,,, firstly i`d check that all the raod-end caps are matching ,,,then i`d check the orientation of all the rods/pistons to see if the offset in all the rods will work the "right way" round ,,,so maybe you can leave the pistons on the rods & just fit them all correctly when going back together

you may see what i`m talking about when you have the pistons out,,, if you have any doubt them bring them over here & i`ll show you

i have 2x of these pistons here,,, & 2x of the "non-valve-relief-ed ones in an engine here some motha do av em hey???

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Turned the piston around tonight. everything looks fine, was an easy task.

all the rods are now the right way around.

the conrod bearing shell doesnt look right though.

is there supposed to be a gap or is the shell not aligned in the rod correctly?

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'66 BRG Morris Mini Deluxe 60HP ATW

No there shouldn't be any gap. Looks like it just needs a little tap to bring it round so the bearing faces are parallel to the face of the rod. ie: