BMW B58 Engine teardown - Only 22.000 kms - What went wrong ?

[@Yeniceri550]

Excellent

[@dnl35projects]

Thanks i

[@justfasial01]

Would love to hear more about sleeving in the next video, for example what's the difference between iron vs steel sleeves in terms of strength and what kind of pistons you need (cast or forged) for each. Are there any downsides to sleeving? Questions we should ask the machine shop when getting a block sleeved? Very curious about that process. Thanks

[@hoost3056]

The sleeves, regardless of material, win or lose on block prep. Both are silly strong, and when installed correctly will outlast everything. Makes you wonder why BMW went away from iron sleeves ......oh, I know. You can put standard pistons and rings back in but why.

[@dnl35projects]

That’s a great question ! In fact I have a video in the pipeline which will be talking about that - I just need to have some free time to work on the editing

[@hasanalothman27]

welcome baack brother, now you did the b58 and still i havent seen the N63tu :(

[@dnl35projects]

Hi, the N63TU cars are a bit rare here in Australia however the F10 M5’s I’ve done have S63TU engines which are exactly the same (assembly wise) to the N63TU

[@hozisalehi]

Maybe test the injectors? If the injector was faulty and cylinder 3 was running lean then it would get super hot in that cylinder. And then in the heat the piston would expand more and wear itself and the cylinder wall out. But again it's just a theory one would have to verify.

[@dnl35projects]

Yes, the owner bought new injectors but still sent all old ones to get tested

[@lcambilargiu]

Seems like the 'wear' might be a manufacturing defect. Can you rule that out? The piston skirt being worn might be down to the excessive rocking that then was tearing up the skirt coating. But the cause of that might be a machining irregularity of the bore it was in. Shouldn't there be some major scoring and scratches if it was actual wear? The appearance of piston crowns looked like it was slightly to pretty rich.

[@dnl35projects]

I think it’s got more to do with the absence of a proper tune than a manufacturing defect -

[@lcambilargiu]

@@dnl35projects fair enough but wouldn't you expect to see similar damage on all the piston skirts, see similar damage to the other bores? I would think part of engineering a high performance engine is making serious design considerations to facilitate all cylinders are equally fueled and have equal ingress and egress of gasses, equal masses, etc. The tolerances were all wrong on 1 cylinder.

[@robt8042]

@@lcambilargiu Good point, to me it seems like an injector issue on cyl #3

[@Dikonou]

You have to check the crankshaft!!!! middle pistons have more wear................

[@dnl35projects]

We'll get it checked for sure

[@warrenlucier5796]

Use ductile iron sleeves for the repair.

[@dnl35projects]

Thats a good but expensive option

[@jackk5482]

Definitely a tuning issue resulting in a fuelling problem.. happened me last month. Ive just stuck a used engine in for time being keeping my other engine as a project to build myself over the next year or so.. fully forged engine single turbo 👌

[@dnl35projects]

I thought the same

[@jackk5482]

@@dnl35projectsi bought my car only recently and it happened. Got very little info on current tuning of it. I think it wasn’t done properly. Engine already got a rebuild by one of its previous owners at 37k km now on 69k km and gone again. Last time cylinder 2 this time cylinder 6