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      08-22-2015, 10:34 AM   #1
BoosTonian
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Upgraded Rod Bearings?

Another rod bearing thread..yes yes, I know, but I don't just have a generic question on them. I was speaking with my technician at my dealership about having him change them. I told him about the BimmerWorld kit. How it has upper and lower sections to change out with the old ones. And that's where he stopped me.

So he informed me that the rod bearings on our cars are split up into 3 different groups and are color coded (either Y, G, or V). There's no way of knowing what the sizes are until you actually see them. His problem is that these different color codes mean different clearances (as follows)

Y= 59.984mm
G= 59.977mm
V= 59.971mm

Reason being is because when the rod bearings are put on they are broken together, so an upper bearing for the first cylinder might be a different size than the upper bearing on the 5th cylinder. And equally, the lower bearing might be different than the upper bearing while also being different than the lower bearing on the 4th cylinder. We all know our cars are very particular and the Germans engineer everything to a fraction of an inch. It's a science.

So now he has me curious. Do companies like BimmerWorld take this into account since it seems as though they create generic rod bearings without these size differentiations. On the other-hand, I told him that many other people run these upgraded rod bearings and I haven't heard any issues. Any input would be great. Planning to go supercharged, so if possible I would like to get these done.
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      08-22-2015, 10:36 AM   #2
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You have mixed up rod bearings and main bearings. The main bearings come in multiple sizes while there are only one size of rod bearing from BMW.
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      08-22-2015, 10:44 AM   #3
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Quote:
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You have mixed up rod bearings and main bearings. The main bearings come in multiple sizes while there are only one size of rod bearing from BMW.


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      08-22-2015, 10:54 AM   #4
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Quote:
Originally Posted by BigBoosting View Post
You have mixed up rod bearings and main bearings. The main bearings come in multiple sizes while there are only one size of rod bearing from BMW.
and he calls himself a tech.

thank you for the info lol much appreciated.
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      08-23-2015, 06:39 AM   #5
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Quote:
Originally Posted by MThree_driver View Post
and he calls himself a tech.

thank you for the info lol much appreciated.
Go call that fool out so he's not feeding this garbage to others.
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      08-23-2015, 09:47 AM   #6
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Go call that fool out so he's not feeding this garbage to others.
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      08-23-2015, 11:51 AM   #7
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Quote:
Originally Posted by Move Over
Quote:
Originally Posted by MThree_driver View Post
and he calls himself a tech.

thank you for the info lol much appreciated.
Go call that fool out so he's not feeding this garbage to others.
Haha well he's a good guy, just messed me up with upgrading my rod bearings. I guess it's because he's never had to do them before? :
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      08-23-2015, 12:16 PM   #8
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Quote:
Originally Posted by MThree_driver View Post
Haha well he's a good guy, just messed me up with upgrading my rod bearings. I guess it's because he's never had to do them before? :
Probably not. Not many dealerships have done them, at least around me. You may want to inform him so at least he knows!
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      08-23-2015, 12:20 PM   #9
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Quote:
Originally Posted by Move Over
Quote:
Originally Posted by MThree_driver View Post
Haha well he's a good guy, just messed me up with upgrading my rod bearings. I guess it's because he's never had to do them before? :
Probably not. Not many dealerships have done them, at least around me. You may want to inform him so at least he knows!
Ya I told him, and he relooked at it and said oh you're right lol..only one m3 has ever come in for rod bearings so there's only one tech there that's done them.
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