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Austinsevenfriends
Oversize gudgeon pins - Printable Version

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Oversize gudgeon pins - "Slack Alice" Simon - 16-10-2018

Did someone mention oversize gudgeon pins to help out worn little end eyes?

Or did I dream that?

And, if I didn't dream it, who supplies them?

Cheers,

Simon

RE: Oversize gudgeon pins - dickie65 - 16-10-2018

Hi Simon,
I suspect a good second hand rod would be wiser.
If you have the little end machined you will also have to have the pistons machined to suit which will mean more work and expense.
If the little ends are worn that means the pinch bolt has been loose or broken.
This often leads to the rod splitting downwards from the gudgeon pin, so get your rods crack tested before any work is done on them.
You might find a rod that just needs to be bored to suit your crankshaft if you are lucky.

Best of Luck Dickie

RE: Oversize gudgeon pins - Ian Williams - 16-10-2018

Would 13mm pins as fitted to Renault and Honda piston's be any help to you?

RE: Oversize gudgeon pins - Zetomagneto - 16-10-2018

(16-10-2018, 05:56 PM)Slack Alice Wrote: Did someone mention oversize gudgeon pins to help out worn little end eyes?

Or did I dream that?

And, if I didn't dream it, who supplies them?

Cheers,

Simon

I have a new set of pistons .020” oversize, .002” gudgeon pins, they are old stock Hepolite.
You would need get your rods honed to size.

RE: Oversize gudgeon pins - Robert Foreman - 16-10-2018

How can one hone a clamp type split rod little end ??

RE: Oversize gudgeon pins - Zetomagneto - 16-10-2018

(16-10-2018, 10:16 PM)Robert Foreman Wrote: How can one hone a clamp type split rod little end ??

Don’t think you can, the OS pins I have are fully floating.

RE: Oversize gudgeon pins - "Slack Alice" Simon - 22-10-2018

Apologies for the time taken to come back to this, I've been busy on other things.

13mm pins would fix it - where do I get them, what do I ask for?


Thanks

Simon

RE: Oversize gudgeon pins - Zetomagneto - 22-10-2018

(22-10-2018, 03:13 PM)Slack Alice Wrote: Apologies for the time taken to come back to this, I've been busy on other things.

13mm pins would fix it - where do I get them, what do I ask for?


Thanks

Simon

Hi Simon

Here are some genuine Honda ones https://www.lsengineers.co.uk/honda-gx100-gudgeon-pin.html
Obviously you will need to ream your pistons and small ends to 13mm, I Would suggest you use a LH spiral fluted HSS hand reamer.I am assuming you have clamp bolt conrods, if they are fully floating rods then it would be better to get them honed,but you can’t hone the pistons as you are likely to get abrasive material impregnated in the aluminium.

RE: Oversize gudgeon pins - "Slack Alice" Simon - 22-10-2018

Thanks for that, it will save a set of rods, I hope.

Simon

RE: Oversize gudgeon pins - Ruairidh Dunford - 23-10-2018

Simon,

in your shoes, I would be looking to source another rod.

However if you do proceed as discussed above, remember you will need clamp type gudgeon pins.