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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Piece of Accessory Belt in Valve Cover



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      01-22-2020, 05:21 PM   #1
fortywater
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Piece of Accessory Belt in Valve Cover

Hey everyone, my Indy recently found a small piece of what looked to be like the accessory belt in my valve train when the valve cover was being replaced. The piece was about 3 inches long.

I am assuming the PO had an accessory belt shred on it at some point before he sold it to me about 4 weeks ago.

I plan on having the indy put it up on a lift and remove the crank pulley and inspect the seal, but my question is, if there was even 1 small piece of belt in there, is the seal likely done for? I have no oil leaking from the seal currently, and so my fingers are crossed that the seal is mainly in-tact, however I am scared that if the seal is intact, that means that either multiple pieces got by without damaging the seal, or the PO just rolled the dice, replaced the seal and belt, and sold it.

Trying to avoid spending an arm and a leg dropping the pan and inspecting everything, but I understand how serious of a situation this can be.

Is it possible for pieces of belt to get by without damaging the seal? Seems like this wouldn't be a possibility....correct me if I am wrong.
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      01-23-2020, 10:32 AM   #2
fortywater
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Update: After communicating with the previous owner he told me that he did in fact shred an accessory belt and replaced the leaking OFHG that caused the belt to shred, the belt, and the front crank seal as a precaution. He told me he did not inspect inside the engine for pieces of belt. Apparently his mechanic said there was "no risk".

So, at this point, inspecting the crank seal is pointless. Looks like I am going to have to drop the pan and clean it out along with the oil pick-up tube. Better safe than sorry, just trying to protect my investment and not grenade the motor.
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      01-24-2020, 01:17 AM   #3
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Quote:
Originally Posted by fortywater View Post
Update: After communicating with the previous owner he told me that he did in fact shred an accessory belt and replaced the leaking OFHG that caused the belt to shred, the belt, and the front crank seal as a precaution. He told me he did not inspect inside the engine for pieces of belt. Apparently his mechanic said there was "no risk".

So, at this point, inspecting the crank seal is pointless. Looks like I am going to have to drop the pan and clean it out along with the oil pick-up tube. Better safe than sorry, just trying to protect my investment and not grenade the motor.
If you are going through the trouble of having your mechanic drop the subframe and oil pan, depending on how many miles you have on the motor, you might consider having the rod bearings inspected/replaced. I seem to recall someone saying its only 1.5 hours additional labor by the book once the subframe and pan are down. There have been a few cases - me included - of rod bearings showing significant wear at relatively low miles.
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      01-24-2020, 08:43 AM   #4
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If the previous owner didn't notice an ofhg leak bad enough to make the belt slip I'd be concerned about how well the car was maintained. fatty is right, would probably be very worthwhile to have the rod bearings done while the pan is off.
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      01-24-2020, 10:22 AM   #5
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Quote:
Originally Posted by fatty335 View Post
If you are going through the trouble of having your mechanic drop the subframe and oil pan, depending on how many miles you have on the motor, you might consider having the rod bearings inspected/replaced. I seem to recall someone saying its only 1.5 hours additional labor by the book once the subframe and pan are down. There have been a few cases - me included - of rod bearings showing significant wear at relatively low miles.
Appreciate the info. I just turned over 95k miles....when were yours showing wear?

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Originally Posted by lwgrenier View Post
If the previous owner didn't notice an ofhg leak bad enough to make the belt slip I'd be concerned about how well the car was maintained. fatty is right, would probably be very worthwhile to have the rod bearings done while the pan is off.
Most definitely. Appreciate the response.
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      01-24-2020, 11:11 AM   #6
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looks like he did his at 72k

https://www.e90post.com/forums/showthread.php?t=1572184
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      02-06-2020, 01:06 PM   #7
fortywater
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For anyone following, here is all of the debris that came out of the oil pick up tube and oil pan. Previous owners "master tech" friend at Lexus said it "wouldn't be an issue".

Thankful for a good and thorough Indy!

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      02-06-2020, 02:21 PM   #8
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that's not good... did you end up having your bearings replaced?
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      02-06-2020, 03:11 PM   #9
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Quote:
Originally Posted by fortywater View Post
For anyone following, here is all of the debris that came out of the oil pick up tube and oil pan. Previous owners "master tech" friend at Lexus said it "wouldn't be an issue".

Thankful for a good and thorough Indy!

I mean, it's not a problem.... until it is

Also, nice bolt there!
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      02-06-2020, 04:55 PM   #10
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Quote:
Originally Posted by lwgrenier View Post
that's not good... did you end up having your bearings replaced?
I did not. I took an oil sample and am going to send out for analysis for wear metals.

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Originally Posted by anjuna View Post
I mean, it's not a problem.... until it is

Also, nice bolt there!
Haha exactly. Funny you joke about the bolt, because I got the trans serviced and there WAS a loose mechatronics fastener in the pan from the PO or whoever worked on it last. Thankfully no damage...

Remind me why I bought a used BMW? lol
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      02-07-2020, 01:13 AM   #11
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Quote:
Originally Posted by fortywater View Post
I did not. I took an oil sample and am going to send out for analysis for wear metals.



Haha exactly. Funny you joke about the bolt, because I got the trans serviced and there WAS a loose mechatronics fastener in the pan from the PO or whoever worked on it last. Thankfully no damage...

Remind me why I bought a used BMW? lol
Unfortunately, with BMW's switch from lead/copper to tin/aluminum rod bearings, analyzing your oil is not as "helpful" as it used to be in terms of alerting you to increased wear. Good luck and post your results!
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      02-10-2020, 12:54 PM   #12
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Quote:
Originally Posted by fatty335 View Post
Unfortunately, with BMW's switch from lead/copper to tin/aluminum rod bearings, analyzing your oil is not as "helpful" as it used to be in terms of alerting you to increased wear. Good luck and post your results!
Will do!
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