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Old 05-21-2020, 11:19 PM   #1
crocs
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M54b25 vanos

Hey guys, so ive bought an used double vanos unit, ive changed the rubber gaskets and stuff. Im about to swap this one with the one on my car. My question is do i need to lock the engine if im only swaping the units? or i can just remove it, put on the new one bolt in and go?
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Old 05-21-2020, 11:32 PM   #2
ptsao
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when I did mine w/ VC job, I just remove and install, those 2 bolts are reverse thread

Last edited by ptsao; 05-21-2020 at 11:33 PM.
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Old 05-21-2020, 11:42 PM   #3
crocs
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Yeah i know that those 2 bolts are reverse. Ill wait for more opinions tho, i mean i could do timing aswell, but dont have the time for it now ***x1f615;
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Old 05-22-2020, 12:57 AM   #4
LeverThis
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Timing is not affected when removing & installing the vanos ... just don't turn the engine over while it's out.
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Old 05-22-2020, 01:59 AM   #5
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Quote:
Originally Posted by LeverThis View Post
Timing is not affected when removing & installing the vanos ... just don't turn the engine over while it's out.
^This. Remove, no turny engine-y, replace, job done!
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Last edited by BaliDawg; 05-22-2020 at 05:41 AM.
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Old 05-22-2020, 03:41 AM   #6
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Alrighty, thanks ***x1f642;
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Old 05-22-2020, 11:37 AM   #7
DBecker
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To echo the answers: when you remove the VANOS unit you unscrew the connection to the helix cups, leaving them behind. It's those helix cups which adjust the cam timing.

Even if do something (e.g. strip the screw head) so that you have to remove the helix cups with the VANOS unit, they are keyed on the M52tu / M54 / M56. It's only a little fiddling to put them back in with the cam timing unchanged.

This makes it much easier to service than the older single VANOS, where the unkeyed helix cup was removed with the VANOS unit.
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Old 05-22-2020, 12:02 PM   #8
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To be on the safe side, put scratch marks in the chain and gears to align them, and zip tie the chain to the gears in two places so they can't move.
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