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What is the biggest oversized shells for big end
Posted: Mon Sep 07, 2020 4:17 pm
by 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
Re: What is the biggest oversized shells for big end
Posted: Mon Sep 07, 2020 5:20 pm
by 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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Re: What is the biggest oversized shells for big end
Posted: Mon Sep 07, 2020 6:05 pm
by 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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Re: What is the biggest oversized shells for big end
Posted: Mon Sep 07, 2020 7:14 pm
by 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?
Re: What is the biggest oversized shells for big end
Posted: Mon Sep 07, 2020 7:37 pm
by Lightweight_911
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All early 911 cranks were forged ...
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Re: What is the biggest oversized shells for big end
Posted: Mon Sep 07, 2020 7:54 pm
by Bigfoot
Many thanks, I’ll see if I can order a set. Appreciate your advice
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