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Old 12-31-2012, 03:58 PM   #1
FastHackem
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Uh Oh!! Vanos Piston And Wall Scored!! Now What? PICS

So I finally got around to replace my Vanos seals and upon inspection, noticed the piston and piston wall on the exhaust side is scored pretty bad in one spot. So what's the plan now? Can I sand and polish it? Can I just slap it back together and hope for the best? Am I screwed?

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Old 12-31-2012, 04:03 PM   #2
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Ouch! Looks like some grit passed thru there.
Probably work OK if you reassemble, but not for the long haul.

I'd be buying a rebuilt one from Dr. Vanos and kiss this whole unit goodbye.
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Old 12-31-2012, 04:33 PM   #3
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How about something like a brake caliper cylinder hone?
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Old 12-31-2012, 04:47 PM   #4
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I don't think you have much room to hone that out smooth and still find some teflon ring to fit. There's a little tolerance with new teflon ring, but I doubt that much.

I think the dr. vanos replacement is your best shot, but if you have the seals from beisan, you might as well give them a shot. New seals will probably keep the piston from hitting the wall...and although you'd probably spring a leak there, I don't know that that's enough to affect the timing that much. I bet your car could handle it fine...and seems like you hadn't noticed anything up to now anyway.

GL!
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Old 12-31-2012, 04:51 PM   #5
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For $250 and a completely reworked vanos go with dr vanos
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Old 12-31-2012, 06:05 PM   #6
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For $250 and a completely reworked vanos go with dr vanos
Do keep in mind that with a core charge they typically want a "rebuildable core" in return. With that damage they may refuse you.
So the deal with Dr. Vanos would cost you $400.
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Old 12-31-2012, 06:10 PM   #7
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find a damaged junkyard engine and get the vanos from that
i am sure any i6 BMW from 1998-2005 has the same vanos

Last edited by MercForHire; 12-31-2012 at 06:11 PM.
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Old 12-31-2012, 06:25 PM   #8
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I think I'm going to try and sand down the roughness and just leave it be for now. I do have the Besian kit and I have not noticed any power issues before the rebuild. I will report back once it's all broken in. Maybe post some pics of the finished sanding job too.

Thanks everyone! Happy New Year!!!
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Old 12-31-2012, 06:45 PM   #9
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I'd bet that it will last you several years before you have to replace the seals again.
The new teflon rings won't be as worn down as your currents...

Last edited by TrickTizzle; 12-31-2012 at 06:47 PM.
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Old 12-31-2012, 06:56 PM   #10
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I will report back once it's all broken in. Maybe post some pics of the finished sanding job too.
Look forward to the follow-up!


Seems like some owner wasn't doing oil changes as freq as they should!

Last edited by Stinger9; 12-31-2012 at 06:57 PM.
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Old 12-31-2012, 07:51 PM   #11
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I'm interested in the followup as well. I hope everything works out for you. Good luck.
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Old 12-31-2012, 10:35 PM   #12
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Ok everything is back together. That was a whole lot easier than I was expecting. I sanded both scored pieces with 800 grit and then 10000 grit. I didn't want to take too much off so there are still marks. Basically I just took off the roughness where before, when I slid my finger over it, it would catch my skin. But now, my finger glides over it much more smoothly. We will see what happens.

Oh and @ 130K miles no sludge!! WHOO HOO!! Guess the previous owners at least changed the oil. Lol

After Mildly Sanding (old gaskets still on):

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Valve Cover Off:

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Old 12-31-2012, 10:46 PM   #13
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i dont think its "that" bad TBH IMO and i almost bought a vonos unit before to **** around with in the house to see the genitals of the damn thing
and it only cost me 30$ from a 528I tho
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Old 12-31-2012, 11:06 PM   #14
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i dont think its "that" bad TBH IMO and i almost bought a vonos unit before to **** around with in the house to see the genitals of the damn thing
and it only cost me 30$ from a 528I tho
oh god what a nasty thing to say
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Old 12-31-2012, 11:06 PM   #15
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Originally Posted by FastHackem View Post
Ok everything is back together. That was a whole lot easier than I was expecting. I sanded both scored pieces with 800 grit and then 10000 grit. I didn't want to take too much off so there are still marks. Basically I just took off the roughness where before, when I slid my finger over it, it would catch my skin. But now, my finger glides over it much more smoothly. We will see what happens.

Oh and @ 130K miles no sludge!! WHOO HOO!! Guess the previous owners at least changed the oil. Lol

After Mildly Sanding (old gaskets still on):

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Valve Cover Off:

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I would probably shorten your OCI just a tad -- or switch to a better oil. That engine has more varnish than many other M54s, and it looks like you have sludge just starting to form on the intake side of the VANOS.
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Old 01-01-2013, 12:02 AM   #16
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I would probably shorten your OCI just a tad -- or switch to a better oil. That engine has more varnish than many other M54s, and it looks like you have sludge just starting to form on the intake side of the VANOS.
Really? I was surprised it looked as good as it did. I use the BMW oil & filter, but I do take it to the full 15k mile interval. I have pondered doing the change at 7500. I have had the car since 98k miles, so only 2 oil changes with a third happening this weekend. I'm going to run SeaFoam in the oil to clean things up a bit despite what so many members on here are scared to do themselves. I've run a similar product, LubroMoly Engine Flush, in my 944 with no ill effects.
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Old 01-01-2013, 12:26 AM   #17
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Really? I was surprised it looked as good as it did.
Just for reference, see my cams at 97K miles with changes every 7500. I suspect yours has gone longer than the 15K, but who knows?

http://forum.e46fanatics.com/showthr...braggin&page=4

Oh, and nice touch on the restoration you've done on the vanos piston and cylinder. Piston wear grooves messed up won't matter, but on the cylinder they won't seal perfectly against the gasket, and might facilitate faster wear of the gasket. But the effect would be on performance, so you'll know if you're not happy what the reason is.

Last edited by Stinger9; 01-01-2013 at 12:58 AM.
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Old 01-01-2013, 12:32 AM   #18
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Just for reference, see my cams at 97K miles with changes every 7500. I suspect yours has gone longer than the 15K, but who knows?

http://forum.e46fanatics.com/showthr...braggin&page=4
Oh yeah I remember checking out your thread. Nice looking motor! Yeah I wouldn't doubt if the PO's went a bit over judging by the other areas of the car that were neglected. I was just happy not to see an ass load of sludge in there which is what I was expecting.
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Old 01-01-2013, 02:44 AM   #19
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OP-

just wondering what type of air filter you use? K&N, Fram, OEM...?

It seems like the K&N (and similar ones) let more dirt into the engine and cause dirtier oil.
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Old 01-01-2013, 09:10 AM   #20
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Dr. Vanos all day.

Dont even bother reading past post #2.
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