7 replies to this topic

[pete l]

Hi all,

 

I will be taking my MPI engine for a rebore, I have 21253 pistons +20 and my machine shop, here in France, needs to know the piston to bore clearance and where it's actually meseared from on the piston.

 

Does anyone know ?

 

Thanks

 

Pete.

[weef]

Hi, if you Google    Classic Mini Engine Specifications Guide / PDF / PISTON 

 

It's a document from Scribd and this may help you decide the clearence required for your engine.

[Mr Piggy]

My metro manual says , Skirt clearance,
Top 0.0029" to 0.045"
Bottom 0.0009" to 0.0025"

[Spider]

 AE Piston Fitting Instructions.jpg   44.2K   22 downloads

[pete l]

Thanks Chris, can't read it though, it's blurred

[Spider]

On the crown, the part number is stamped on it, then after or under that is a SP and some numbers stamped following that. That's the Skirt to Bore Clearance in metric and the piston is measured at 90 degrees to the Pin, 13 mm up from the bottom of the skirt.

[pete l]

The one I have in my hand says :

 

AE 21253 .020 KKD

 

That's all I can see.

[pete l]

Two pistons have BLD and two have KKD on them.
It must be a code, anyone have an idea ?

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