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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Dec-16-2017, 02:44:54 PM   #1
Wake74
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Default Oil Leak - Front Right Engine

After deferring maintenance on the E46 M3 the last couple of years, due to spending too much time and money on the E36 track rat, I'm finally playing catchup. While I was under the car this weekend (yeah MaxJax) replacing both sets of tie-rods (frozen), I noticed a fair bit of oil.

I can see oil drips:

- On bottom of AC compressor
- On front right of oil pan
- Small black cylinder directly behind AC compressor
- I can see streaks on the front of #1 exhaust header pipe. This would explain a touch of oil smell

I'm gathering parts to do the Besian VANOS work over the holidays, and will replace the VANOS gasket place at that time. However, I don't feel a lot of oil leaking front them area.

I can't think of anything else on the left side that is a likely oil leak spot.

Thoughts?

Thanks!
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Old Sat, Dec-16-2017, 02:48:26 PM   #2
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Default Re: Oil Leak - Front Right Engine

Probably the CPV. Order a Viton gasket.

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Old Sat, Dec-16-2017, 02:57:54 PM   #3
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Default Re: Oil Leak - Front Right Engine

Upper timing chain tensioner crush washer. Itís a 32mm if Iím not mistaken


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Old Sat, Dec-16-2017, 02:58:10 PM   #4
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Default Re: Oil Leak - Front Right Engine

Chain tensioner is right above ac pump and, from some of our findings, isn't very tight. I use a dental mirror and flash light to see it. CPV is a very likely culprit it's further back though.
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Old Sat, Dec-16-2017, 05:06:24 PM   #5
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Default Re: Oil Leak - Front Right Engine

I don't think it can be the CPV, as that would be leaking much further back. I've got an updated CPV o-ring so that's on the to-do list either way. Timing chain tensioner would be in the right spot, replacing the plastic chain guide is in the Besian instructions for the anti-rattle procedure. Hopefully, that will fix it.

Thanks for the suggestions!
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Old Sat, Dec-16-2017, 05:08:30 PM   #6
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Default Re: Oil Leak - Front Right Engine

+1 chain tensioner
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Old Sat, Dec-16-2017, 05:13:55 PM   #7
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Default Re: Oil Leak - Front Right Engine

CPV is waaay further back and results in oil accumulation at the back passenger side of the engine right around the tranny bellhousing, so unlikely it's the CPV from your description.

Around where you specify, the black cylinder is the vanos pressure accumulator. Sometimes the high pressure line that connects to the top of it leaks (the other end of it connects to the top of the vanos unit). Sometimes that line cracks and requires replacement along with crush washers for the banjo that is holding it.

Also, as mentioned in the thread, the timing chain tensioner is right above the ac compressor, that can leak by the cyl #1 header.

Could also be your vanos seals in your vanos sealing plate or the vanos gasket that seals the vanos unit to the head. Since the engine sits at an angle, everything drips down to, and accumulates on, the passenger side.

Check those, as those are the most likely culprits. If not there are a few other things to check like timing cover gaskets, front main seal, valve cover gasket, etc.
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Old Sat, Dec-16-2017, 06:02:41 PM   #8
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Default Re: Oil Leak - Front Right Engine

Quote:
Originally Posted by mrgizmo04 View Post
CPV is waaay further back and results in oil accumulation at the back passenger side of the engine right around the tranny bellhousing, so unlikely it's the CPV from your description.

Around where you specify, the black cylinder is the vanos pressure accumulator. Sometimes the high pressure line that connects to the top of it leaks (the other end of it connects to the top of the vanos unit). Sometimes that line cracks and requires replacement along with crush washers for the banjo that is holding it.

Also, as mentioned in the thread, the timing chain tensioner is right above the ac compressor, that can leak by the cyl #1 header.

Could also be your vanos seals in your vanos sealing plate or the vanos gasket that seals the vanos unit to the head. Since the engine sits at an angle, everything drips down to, and accumulates on, the passenger side.

Check those, as those are the most likely culprits. If not there are a few other things to check like timing cover gaskets, front main seal, valve cover gasket, etc.
Excellent post. Thanks!
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Old Sat, Dec-16-2017, 06:30:54 PM   #9
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Default Re: Oil Leak - Front Right Engine

Take it to Forum Member "Kaiv," and he'll fix it right up! That's what I've done.
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Old Tue, Dec-19-2017, 02:25:56 AM   #10
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Default Re: Oil Leak - Front Right Engine

I have the same leak and have been chasing it with little luck.


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Discussing Oil Leak - Front Right Engine in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)