BMW M5 (V10) Conrod Bearing FAIL - ouch!

This is what happens to the BMW M5 V10 Crankshaft once a Conrod Bearing fails.
This engine wasn't even 'knocking' - it was recovered in to us with it's EML warning on the dash and fault codes relating to 'Vanos Mechanical Jamming'.

This turned out to be all 4x Vanos Solenoids not working (hence EML on) due to small metallic particles stuck in them.

We first checked the Oil Filter Housing and could see these very small metallic particles floating in the oil system.

We knew these metallic particles would have likely come from a worn bearing within the engine.

We started our investigations and it didn't take at all long to find Cylinder No.10 Conrod Bearing had failed.

You could actually see and feel movement when you touched the Conrod.

Once the Conrod Cap was removed it was clear that the Conrod Bearing had not only failed but had also 'spun'.

This meant the Conrod Bearing pair were no longer fitted in their Cap and Rod and instead were dragging themselves around the Crankshaft in a radial motion.

This had caused the Conrod Bearings to touch the Crankshaft Journal (should never touch) and therefore cause severe damage to the polished surface - so much that you could feel a 'step' from side to side, not to mention the rough feel and total scratched finish.

This is classed as Conrod Bearing Failure.

Due to the £50 Conrod Bearing failing, they also caused the £3100 Crankshaft and £160 Conrod to need replacement, at a minimum.

This engine will need to be rebuilt.

To remove the Crankshaft you have to first remove the Gearbox, and then remove the S85 V10 Engine from the M5 body, and place it on an Engine Stand to be worked on.

Due to the Conrod also needing replacement, Bank 2 Cylinder Head would have to be removed so the Piston & Conrod could be removed (these can only be removed from the top hence the need to remove the Bank 2 Cylinder Head).

So a Cylinder Head Gasket Set would also be required.

All these parts and labour costs really do add up and commonly run around £7000 GBP.

However, if you have concerns or worries about the condition of your M5 (or M6) V10 Conrod Bearings, then we are able to replace them (and Conrod Bolts) as a preventative measure with either the new style BMW 702/703 Conrod Bearings, or uprated ACL Conrod Bearings.

You can see our prices and procedure here:
http://www.redish-motorsport.com/E60E61M5S85ConrodBearingShells.html

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