BMW N47 Engine Rebuild Gone Wrong- I was shut down

How this engine failed • Rebuilt BMW N47 Engine...

[@scottjohnstone4092]

I rebuilt an N57 with an aftermarket crankshaft and it only lasted 450 miles before it started knocking again. Had to purchase a used engine and fitted that. 1000 miles so far 🤞🏻

[@W15Garage]

Thanks for your feedback! I like the donor car/donor engine route myself. Original new cranckshasfts cost a ton of money for a reason. Good luck with your new engine!

[@scottjohnstone4092]

@@W15Garage I was £900 for aftermarket crankshaft, £500 for BMW oil pump and every gasket, bearings and bolts. I worked out near £4000 in total. Was an expensive lesson

[@W15Garage]

@@scottjohnstone4092 🤦‍♂️that’s a lot of money indeed. Sorry to hear that, at least you have a good engine now.

[@Cardoctorwolverhampton]

Stay away from Turkish or Chinese’s cranks You can get some good quality aftermarket German crankshafts but they are not cheap

[@scottjohnstone4092]

@@Cardoctorwolverhampton it was a Turkish crankshaft I purchased 😭

[@rebekak5555]

Great video! Thank you for sharing both the ups and downs, it’s refreshing to see your honesty. Keep up the good work!

[@W15Garage]

Many thanks. Appreciate it!

[@BiteTheBulletUK]

Another great video with sound reasoning. Onwards and upwards.

[@W15Garage]

Many thanks! Appreciate it

[@Killputin777]

dude! continue and we will support

[@W15Garage]

Thanks mate! Appreciate it!!

[@straight_to_the_point7869]

Sorry for the problem with your crankshaft, i am going through some issues with N47 engine too and that is after taking good care, gentle driving, frequent oil changes and spending so much money on engine parts,these engines are very sensitive and temperamental. I am going back to good old M47,M57 engine equipped car, (probably X3 as a new project) as these engines seems to be build much better than N47 engines and is easier to work with.

[@W15Garage]

Thanks! The M47 and M57 engines are far ahead in reliability, 100% correct! The N47 is a good engine, I’ve seen examples with very high mileage still going strong. I think the key to this is regular oil changes and smart driving (not flooring it when the engine is cold, etc.). However, if you haven't owned the car from new, it’s possible the engine has already suffered from neglect. In that case, despite doing everything correctly, it might not help. Very sensitive engines that’s for sure.

[@mini_special]

For the time you will be cleaning it, I would have just taken it to the shop and they will ultrasound it. I think you will be happier with the result of that instead of you cleaning it, that's what I do.

[@W15Garage]

100% correct, that’s a thorough clean. I just have to find a cranckshaft

[@user-ef5ec7bb1l]

ÜGYES 🥰

[@W15Garage]

Koszi koszi!!

[@Cardoctorwolverhampton]

Bro I rebuild these engines regularly find us on google My question is did you change the oil cooler ?

[@W15Garage]

Thanks for your input. I was going to but didn’t manage to get to that point, as the crankshaft turned out to be rubbish. What crankshaft do you use? Could you recommend a brand or source tested that worked for you? Thanks!

[@Cardoctorwolverhampton]

@@W15Garage this is my experience don’t grind the rod bearings to 0.5 otherwise after some mileage they get hairline fractures and loose oil pressure but not enough to bring on the oil pressure light on and overtime it’s chewed up again I pay around £250 for a std crank or 1 at 0.25 at £150 I’m happy with these prices as buying used n47 engines is like Russian roulette

[@Assimilator1]

So why couldn't the crank be refurbed?

[@W15Garage]

@@Assimilator1 it had minor cracks from the heat

[@realjiver2]

Buy a good used engine and rebuild that.

[@W15Garage]

I bought an accident-damaged donor car and removed the engine to fix my car after this engine failed. But a few comments suggested, "Why not refurbish this crankshaft, put in oversize bearings, and rebuild the engine?" That’s why I started rebuilding it as an experiment. This is the video when the engine died kzbin.info/www/bejne/hH7UfYyQpq50l68si=6gdbgBAHhuNZb_m2