Re-use gudgeon pins. Mk3 1296cc

[Sandy Gibson]

Hi folks

I’m going from +030 to +040” pistons on my engine rebuild.  Got a good deal on new pistons but without gudgeon pins.

Old pins are good.  Anyone know of a reason why they shouldn’t be interchangeable with new pistons?

Thank for all help.

[Nigel Clark]

Check the old gudgeon pins visually for wear marks and if they all appear clean and unmarked, I would reuse them. You could also measure their diameters at different points using a micrometer as an additional check, though probably unnecessary if they are free from visual signs of wear.

Nigel

[dougbgt6]

12 minutes ago, Sandy Gibson said:

Old pins are good.

How do you know? Do as Nigel suggests, but if it was me, I wouldn't waste the time and money and not replace them, no matter how good they are.

Doug

[Pete Lewis]

be careful  as its the pin that wears not the pistons 

general rule is put piston in bucket of hot water  fit pins and when cold the friction of the pin should just support the weight of the con rod when hanging 

Pete

[Sandy Gibson]

Thanks all.  Think on balance I’ll just replace the pins as well.  Budget went out the window long time ago so might as well err on the side of caution!

[Nick Jones]

I’d be a bit surprised if you can buy pins alone. They normally come with pistons….

I agree with Pete on using the existing ones. With the proviso that old and new pistons are from the same manufacturer.

Nick