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Thread: Rod Bearing Failure M62B44

  1. #26
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    That looks good. The mystery continues...

    Pressure relief valve maybe?
    6/98 540i 6sp, Mods: VF S/C, Custom Pulleys, 16 psi Boost, Tuning Tech FS Tune, 42# Injectors, Supersprint Headers, HJS Cats, 3" Custom Exhaust, D.O. Progressive Meth, AEM 320 Fuel Pump, Aeromotive FPR, AEM Failsafe AFR/Boost Gauge, Wavetrac LSD, Style 65 w/275's square, M5 bits;[Steering Box, Clutch, Motor Mounts, Front Sway Bar], Powerflex, Eibach Rear Bar, M3 Shifter, Evans Coolant, 85 Deg Stat, Clutch fan replaced with PWM fan, 10" DVC rear subs, B.A. speakers, Grom Aux and BT, Euro Console, Brushed Ti Trim. DIY everything!

  2. #27
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    No,that pump had been pumping debris. Sides of driven vane are scored, and pits on drive side of rotor.
    But the bearings probably failed first.

  3. #28
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    Some scores yeah, but enough to kill pressure?
    6/98 540i 6sp, Mods: VF S/C, Custom Pulleys, 16 psi Boost, Tuning Tech FS Tune, 42# Injectors, Supersprint Headers, HJS Cats, 3" Custom Exhaust, D.O. Progressive Meth, AEM 320 Fuel Pump, Aeromotive FPR, AEM Failsafe AFR/Boost Gauge, Wavetrac LSD, Style 65 w/275's square, M5 bits;[Steering Box, Clutch, Motor Mounts, Front Sway Bar], Powerflex, Eibach Rear Bar, M3 Shifter, Evans Coolant, 85 Deg Stat, Clutch fan replaced with PWM fan, 10" DVC rear subs, B.A. speakers, Grom Aux and BT, Euro Console, Brushed Ti Trim. DIY everything!

  4. #29
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    With the crap that was in the oil pan, some damage from pumped debris is expected. What I'm trying to identify at this point is the root cause of the bearing failure, not so much to see what parts may be good enough to reuse.

  5. #30
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    Quote Originally Posted by qcdstick View Post
    With the crap that was in the oil pan, some damage from pumped debris is expected. What I'm trying to identify at this point is the root cause of the bearing failure, not so much to see what parts may be good enough to reuse.
    Noted, and like i said, bearings probably failed first.
    The high miles engines (180-200k) that i have taken apart have all had rod bearings worn down to copper/ brass colored backings.
    I dont think that rod bearing failure is just an S62 thing.

  6. #31
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    I'd look at the condition of the wear plates that sammich the pump gears. If there is wear there, there's an easy place for pressure to escape.

    (Where wolf? There wolf)

  7. #32
    JimLev's Avatar
    JimLev is online now Artifically Aspirated Moderator
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    I haven't read all of this post (at airport on my phone), you replaced the chain guides, right?
    Did you forget to put in the small oriface behind the fat green o-ring that feed oil to the tensioner, or is it the U guide. That would result in low oil pressure. The light only comes on below 7 PSI.
    Last edited by JimLev; 07-22-2017 at 04:28 PM.

  8. #33
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    Are you talking about the swivel arm thing at the bottom bolt of the tensioner guide that presses into the block above the crank sort of behind the u guide? I had the guides on and off a few times figuring everything out, but I'm 99.9% sure I did.

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