What is the biggest oversized shells for big end

[Bigfoot]

I have just sent my crankshaft away for crack testing and measurement following a big end failure on a 73 2.4 crank. On my first look with some dodgy calipers it looks like I am on the wear limit of fitting 0.25 if the crankshaft is reground for No.5 conrod. Does anyone know if 0.5 or 0.75 oversized shells are available and if so where, I can only find 0.25?
Any advice would be gratefully accepted please

[Lightweight_911]

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Both -0.5 & -0.75mm undersized bearing sets used to be available but I've only seen -0.5mm in recent years.

Part no. 911.101.901.55 - readily available in USA from 911 engine parts specialists (including Sierra Madre).

A quick search throws up this set at FVD in Germany:

https://www.fvd.net/us-en/91110190155/m ... ith-8.html

I'm sure you could find a set cheaper over here - maybe ask Mike Bainbridge if he could source a set for you.

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[Lightweight_911]

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Sorry -just noticed you asked about big end shells !

-0.50mm undersize set is part no. 914.103.141.60

Joma Parts in the Netherlands list them at ~111 euro:

https://www.jomaparts.com/en/intro

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[911hillclimber]

Iirc the 2.4 T crank is iron, the E and Sforged steel and heat treated?
Do either cranks need heat treatment after grinding?

[Lightweight_911]

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All early 911 cranks were forged ...

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[Bigfoot]

Many thanks, I’ll see if I can order a set. Appreciate your advice


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