Engine knock - Rod bearings issue, savable without an engine replacement?

DrFerry · 05-20-2022, 09:57 AM

Quote:

Originally Posted by 8lueM3

Sorry to ask, what do you mean by 'tabs'?

Also, forgot to upload the outside of one of the RB:

View post on imgur.com

One thing that feels weird to me, is that everytime I googled for "S65 RB replacement", the RB were much more "used", the copper part was showing, however, as the RB I've shown in the pics (which is where it has some damage) doesn't really expose any copper, it actually looks almost "new" - I was expecting something like this (Not my pic):

View post on imgur.com

See example of a rod bearing locking tab in the image below.
.

DrFerry · 05-20-2022, 10:03 AM

Quote:

Originally Posted by 8lueM3

Sorry to ask, what do you mean by 'tabs'?

Also, forgot to upload the outside of one of the RB:

View post on imgur.com

This photo is showing the back of the bearing shell to be heavily scored and worn. This indicates the shell was rotating in the carrier. In other words the bearing was spinning on the crank journal and piston big end journal. You were very lucky. Take a trip to Vegas and play Roulette. You should do quite well.

DrFerry · 05-20-2022, 10:06 AM

Quote:

Originally Posted by 8lueM3

One thing that feels weird to me, is that every time I googled for "S65 RB replacement", the RB were much more "used", the copper part was showing, however, as the RB I've shown in the pics (which is where it has some damage) doesn't really expose any copper, it actually looks almost "new" - I was expecting something like this:

View post on imgur.com

One possible reason your example doesn't show copper is the copper layer has been worn away from the bearing shell spinning on the crank - OR your car is using the later tin type bearings instead of the earlier lead + copper bearings.

Edit: I see your original post says your car is a 2008. The earlier cars had lead + copper RB. So yours has worn away......

8lueM3 · 05-20-2022, 10:19 AM

Wait - Could this (the circled item) be the RB tab? Or is that normal?

View post on imgur.com

tdott · 05-20-2022, 10:24 AM

Quote:

Originally Posted by 8lueM3

Wait - Could this (the circled item) be the RB tab? Or is that normal?

View post on imgur.com

That is where the tab sits, but I can't tell from the picture if there is any broken material in there.

DrFerry · 05-20-2022, 10:33 AM

These are the tabs from the upper shells located and held in the con rod. Look for remnants in the bottom rod bearing caps.
.

05-20-2022, 10:19 AM	#26
8lueM3 New Member 22 Rep 9 Posts Drives: e92 M3 2008 6MT Join Date: Feb 2022 Location: Nottingham, UK iTrader: (0)	Wait - Could this (the circled item) be the RB tab? Or is that normal? View post on imgur.com
	Appreciate 1 DrFerry6728.50 Quote

05-20-2022, 10:33 AM	#28
DrFerry Field Marshal 6729 Rep 1,829 Posts Drives: '08 E92 M3 Join Date: Jul 2010 Location: Greenville, SC iTrader: (5) Garage List 2008 BMW M3 [5.25] 2015 BMW X5 [4.50]	These are the tabs from the upper shells located and held in the con rod. Look for remnants in the bottom rod bearing caps. . Attached Images __________________ '08 E92 M3 DCT Melbourne Red/Bamboo Beige Leather/EDC/SSP Spec-R DCT clutch discs/SSP Pro-Gold DCT Fluid/Quaife LSD/3:45 Final Drive by Diffs Online/BE Bearings & ARP Bolts/Vibra Technics Engine Mounts/M3 World HFC X-Pipe/LUX H8 180/BPM Sport DCT Tune/PFC Z-Rated Pads/ECS Brass Brake Caliper Bushings/Alex Shop Solid Sub-frame Bushings/Motul 600/Tint
	Appreciate 2 8lueM321.50 ///M Power-Belgium63310.00 Quote