[mangos_irina]

Hey guys

unfortunately, looks like my rod bearings are toast.

I'm looking for recommendations for an engine rebuilding company for the N55 motor. Thank you in advance

[435gc]

Most quality independent BMW mechanics can do the job.

You can use the bimmershops website to find good local BMW indies.

How do you know rod bearings are shot?
Whats the history of the car?

[Boostedphil698]

I'd also like to know how rod bearings were determined to be the issue.

[mangos_irina]

Originally Posted by 435gc

Most quality independent BMW mechanics can do the job.

You can use the bimmershops website to find good local BMW indies.

How do you know rod bearings are shot?
Whats the history of the car?

Not really... I've reached out to a couple of shops who declined it. I'd rather find someone who specializes in that field.

The car has a clear rod knock and metal shavings in the oil filter and oil. Also was looked at by a BMW tech.

[AmuroRay]

It might be cheaper to do a remove and replace with a long block from a donor car. You can find them at Car-part.com.

Also consider, you don't need a built motor to run 450whp, which is about the streetable limit to RWD anyways.

[cfm56d7b]

mangos_irina, what's the build date of your vehicle? Some earlier N55 engines (in 2013 vehicles) experienced premature connecting rod bearing wear and BMW is aware of this issue.

[mangos_irina]

Originally Posted by AmuroRay

It might be cheaper to do a remove and replace with a long block from a donor car. You can find them at Car-part.com.

Also consider, you don't need a built motor to run 450whp, which is about the streetable limit to RWD anyways.

Definitely one of the options. Thanks for the website will be very useful if I go that route.

[mangos_irina]

Originally Posted by cfm56d7b

mangos_irina, what's the build date of your vehicle? Some earlier N55 engines (in 2013 vehicles) experienced premature connecting rod bearing wear and BMW is aware of this issue.

Yea the BMW tech told me about this. This is a 2015 and not that high in miles so I was surprised the rod bearings went.

[lebaaron]

here's my experience :

2013 335i xdrive 100k miles, got it inspected by bmw before to buy, it was knocking at high rpm apparently then got the whole engine replaced (they decided not the turbo ) by bmw, anyway for a super well maintained car I was very surprised as well... it remains a mystery Wat version of the engine they put in tho.. Im hoping it's a version with the problems addressed.

they added a 2 year warranty on the engine.

good luck!

[$howtime456]

Miami Engines Or Project Motorwerks.

[thejeremyman9]

Originally Posted by lebaaron

here's my experience :

2013 335i xdrive 100k miles, got it inspected by bmw before to buy, it was knocking at high rpm apparently then got the whole engine replaced (they decided not the turbo ) by bmw, anyway for a super well maintained car I was very surprised as well... it remains a mystery Wat version of the engine they put in tho.. Im hoping it's a version with the problems addressed.

they added a 2 year warranty on the engine.

good luck!

2013 PWG i believe had the older rod bearings, so different than OP here.

[lebaaron]

Originally Posted by thejeremyman9

2013 PWG i believe had the older rod bearings, so different than OP here.

Different, same result.

[Bl00DY F30]

Originally Posted by mangos_irina

Hey guys

unfortunately, looks like my rod bearings are toast.

I'm looking for recommendations for an engine rebuilding company for the N55 motor. Thank you in advance

Been through the same thing man car-part was my source as well for getting a donor motor got it from a place called Benzeen Auto Parts had it shipped out with no problem and a year warranty on the motor now got a big boost kit on it been running it since with no issues. My advice would get a donor motor and while its out what ever shop you decide to work on your car have them replace all gaskets as well as rod bearings as this is what I did wish you all the best!

[mangos_irina]

Originally Posted by $howtime456

Miami Engines Or Project Motorwerks.

Thanks man I've reached out to Project Motorwerks. It's within driving distance.

[frchdragon]

I agree with what has been written, rebuilding an N55 with a bad rod bearing is dicey at best (damaged crank). I would go with the warrantied used engine and refresh it with new gaskets and rod bearings.

[capital335i]

mangos_irina any updates on what happened with your rebuild ?

[mangos_irina]

Originally Posted by capital335i

mangos_irina any updates on what happened with your rebuild ?

Ended up just buying a used motor with similar milage. It was the easiest/quickest option. So far no other issues.

[arekuf3x]

Was any maintenance done on old engine before rod bearings let go? Like oil filter housing gasket by chance? These engines let go because of oil starvation or poor maintenance.

[mangos_irina]

Originally Posted by arekuf3x

Was any maintenance done on old engine before rod bearings let go? Like oil filter housing gasket by chance? These engines let go because of oil starvation or poor maintenance.

Tried to be as preventative as possible. Oil Was changed every 5k miles. (Under my ownership) every 10 before that. Housing gasket and valve cover were done 15k before the rod knock. if I had to pick a reason it might be Btoodmod3 tune? Drove on Stage 1 for a year no issue but same night switched to stage 2 did four pulls with friends (not even close to redline). Car Shut off and when I turned it back on there was a knock. Then again, maybe just a coincidence.

The BMW mechanic that changed the engine did say that the rod bearings for this engine come from different facilities and his going theory is that some are faultier than others since he has seen a couple rod knocks come through but no way to know what you have unless you take them out to see where they were made.

[Polo08816]

Originally Posted by mangos_irina

Ended up just buying a used motor with similar milage. It was the easiest/quickest option. So far no other issues.

You got lucky. I tried 2 used engines with no success. Both of them were junk.

Ended up buying a new engine from BMW. A lot of used engines are junk these days. If someone has a working engine, why would they sell it with the car market the way it is?

[mangos_irina]

Originally Posted by Polo08816

You got lucky. I tried 2 used engines with no success. Both of them were junk.

Ended up buying a new engine from BMW. A lot of used engines are junk these days. If someone has a working engine, why would they sell it with the car market the way it is?

Damn man that sucks. A lot of these things just boil down to luck. I'll probably end up selling it in the coming months just to get rid of it anyways.

[arekuf3x]

Originally Posted by mangos_irina

Tried to be as preventative as possible. Oil Was changed every 5k miles. (Under my ownership) every 10 before that. Housing gasket and valve cover were done 15k before the rod knock. if I had to pick a reason it might be Btoodmod3 tune? Drove on Stage 1 for a year no issue but same night switched to stage 2 did four pulls with friends (not even close to redline). Car Shut off and when I turned it back on there was a knock. Then again, maybe just a coincidence.

The BMW mechanic that changed the engine did say that the rod bearings for this engine come from different facilities and his going theory is that some are faultier than others since he has seen a couple rod knocks come through but no way to know what you have unless you take them out to see where they were made.

I wonder if after oil filter housing was done, the engine was primed before it was started, sometimes the engine can experience oil starvation and damage the rod bearings after ofhg job if it’s not primed.