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Old 09-24-2018, 01:56 PM
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Join Date: Mar 2018
Posts: 47
Conn. Rod bolt and main bearing cap bolts

Got my new je pistons in for the turbo m104. Engine should be reassembled in a few weeks.

All bolts for connecting rods, main bearing cap bolts, and flexplate bolts all measure within spec., but I'm not sure If i should still replace them.

Any strength benefits of replacing the bolts or am i just being paranoid? Any thing better than stock for connecting rod bolts? M9x1 x 52mm
Price at dealership is over $450

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Old 09-25-2018, 01:35 AM
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Join Date: Mar 2018
Posts: 47
Gonna end up ordering bolts for peace of mind, about half the price on pelican.

Any reason i shouldnt go with the febi bilstein connecting rod bolts?
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Old 09-25-2018, 09:40 AM
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Join Date: Jan 2012
Posts: 7,511
Have you looked at ARP or similar? There might be something off the shelf from another engine.

The stock bolts are probably $$ due to low demand.
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Old 09-25-2018, 12:34 PM
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Join Date: Mar 2018
Posts: 47
I've checked there online catalog but haven't called them.
The inline bmw bolts are close but are m9x1.25
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Old 10-07-2018, 10:34 PM
Tony H's Avatar
Join Date: Oct 2005
Location: Bandon, Oregon
Posts: 1,110
I doubt there would be anything better than stock by any company-I would not worry about the stock hardware. I have never heard of any Mercedes rod or main bolt failing.
Tony H
111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux-Dad bought new
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Old 11-06-2018, 01:06 AM
sm. pelle's Avatar
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Join Date: Apr 2007
Location: Estonia, Tallinn
Posts: 46
Just to be shure put new OE bolts.
Friends om605 had rod bolt failure(tough he had bit extreme rpm's, 7k)

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