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Question about misplaced tabs on contemporary big end b. shells?
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dennis 356
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PostPosted: Tue Mar 06, 2018 8:02 am    Post subject: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

Would like to ask what to do with the nowaday´s big end bearings and their tabs being placed on a wrong side?
Is it just to grind down the tabs hopping the bearings won´t spin? Sounds like a bit optimistic......or is there another trick to it?
I´ve seen Walter Odenthal on Youtube doing something like grinding down the newly purchased bearings/tabs, but one couldn´t get a good look at how and what he did and he never explained anything on the subject either (odd when anyway doing an educative video), so still greek to me......?

Anyone of you guys with experiance know?

Thanks,
Dennis
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badsix
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PostPosted: Tue Mar 06, 2018 10:05 am    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

I sure wouldn't grind the tabs off, that's a disaster looking for a place to happen. what you need to do is get a set of later rods with the tab on the correct side they are a much better rod also.
Jay D.
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dennis 356
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PostPosted: Tue Mar 06, 2018 3:15 pm    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

badsix wrote:
I sure wouldn't grind the tabs off, that's a disaster looking for a place to happen. what you need to do is get a set of later rods with the tab on the correct side they are a much better rod also.
Jay D.


I think just a brand new rod set comes with the tabs placed on the correct side and that would be a bundle to pay just because of some malplaced lousy tabs, no there must be another way.....have a hard time imagining everyone restoring a 356 motor has to buy another con rod set because of this......

Dennis
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MoPor
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PostPosted: Tue Mar 06, 2018 8:52 pm    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

http://forum.porsche356registry.org/viewtopic.php?f=1&t=25499

If you have the 502 rods I wouldn't use them again.
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'58 356A coupe
'00 Boxster S
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dennis 356
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PostPosted: Wed Mar 07, 2018 12:58 am    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

I´ve one set 502 rods for one of the engines and 616 ones for the two other engines.

Dennis
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dennis 356
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PostPosted: Wed Mar 07, 2018 1:48 am    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

Started dismantelling con rods from the late A crank yesterday and found ground off tabs on the bearing shells, odd, a job that must be at least 30 years old, was it difficult sourcing correct shells already than?

Dennis
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badsix
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PostPosted: Wed Mar 07, 2018 9:34 am    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

you can buy used 616 rod reasonable then have them reconditioned. its a lot cheaper than buying new rods.
Jay D.
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dennis 356
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PostPosted: Wed Mar 07, 2018 10:10 am    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

I´ve found out what the trick is, or how to adjust the old con rods to the "new" bearings when disassembling yet another crank (B) today and where the late style bearing shells fit in with no problems still using the original con rods, thanks to reworking them slightly. Could be done by a machine and also apparently just with the help of a small dremmel and a vice as in this Youtube video (into the 2th minute).

https://www.youtube.com/watch?v=X13VNtfE90E
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Starbucket
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PostPosted: Wed Mar 07, 2018 3:19 pm    Post subject: Re: Question about misplaced tabs on contemporary big end b. shells? Reply with quote

Buy a small chisel (metal not wood chisel) and grind the sharp point to a flat a little less wide than the notch and put the bearing in one half and clamp gently across face on the opposite side of studs/bolts in a vise (protecting the split face from vise jaws to keep bearing from moving) and take a small ball peen hammer and give the bearing a gentle whack where the tab goes and vola! new tab in correct place. No tab = spun bearing within a few miles of driving. Check that rod rotates freely after torqueing.
30+ years of making Babbitt bearings and rebabbitting old bearings.
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