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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 Fri, Oct-12-2018, 02:25:02 AM   #1
josee_alvarenga
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Default Oil leak cpv

hey guys, working on finding an oil leak. For those that had to replace their CPV, was the leaking very little?? or was it leaking a lot? mine is leaking quite a bit, passenger side of car, all over headers, front control arms, and part of the brakes so iím not sure if my symptoms are that of a faulty pressure valve
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Old Fri, Oct-12-2018, 03:33:10 AM   #2
TheSt|G
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Default Re: Oil leak cpv

It is going to leak eventually if you don’t replace it. So do the upgrade, clean the area, see if the mess returns.
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Old Fri, Oct-12-2018, 03:41:35 AM   #3
josee_alvarenga
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Default Re: Oil leak cpv

meant to write that i didnít know where my car was leaking from but i suspected the CPV, but youíre right i think i should replace the O ring anyways now that iím down there


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Old Fri, Oct-12-2018, 05:16:20 AM   #4
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Default Re: Oil leak cpv

From what you are describing, I'm not sure it's the cpv in your case...

All over headers - which cylinders, bank 1 or 2 collectors? CPV is basically just under cyl#6, very close to the bell housing.

All over front control arms and brakes...those are too far forward of the CPV location to be the CPV...and the brakes are pretty isolated in wheel well, especially if you have all the undertrays intact.

My guess is the chain tensioner, that sits under cyl#1 and more inline with the area you are describing...

Get some paper towels and start dabbing all around (once car is cool so you don't burn yourself).

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Fri, Oct-12-2018, 07:12:10 AM   #5
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Default Re: Oil leak cpv

Or Vanos accumulator.
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/// 2004 SilberGrau M3 ∑ Coupe ∑ 6MT ∑ slicktop ∑ manual seats ∑ zero options ∑ JOURNAL
-NA S54-


∑Evolve-R Alpha N ∑ Evolve CSL CF Airbox ∑ Eventuri Scoop ∑ Supersprint V1 stepped 63mm ∑ SS V1 S pipe 63mm + 200 cell HFC ∑ OE sect 2 60mm ∑ SS Sport 60mm
∑Besian ∑ RE pullies/fan delete ∑ WPC rod bearings ∑ GroundControl S/A (Koni/Eibach 440/550) + tall RSMs ∑ TMS Camber & Subframe plates ∑ SPC Adj alloy rear camber arms
∑RE Trans Mounts ∑ AKG poly SUB/DIFF 95a ∑ SDW RTAB ∑ Weighted ///M knob + UUC DSSR + delrin carrier bush ∑ OE CSL trunk ∑ APEX 75mm Studs
∑Sportline 8S 18"x8.5/9.5" ∑ MPSS 245/275 ∑ Brembo 996 36/40 345mm CSL Textar FF & 28/30 328mm CSL ATE "D738" FF ∑ CM brackets & ss/teflon lines
∑Pioneer DEH-80PRS ∑ Eclipse PA5422 ∑ CDT HD-6 + WS-100i ∑ CDT EX-530 ∑ 8" Kicker

DD/Beater: 1999 Civic LX - Kenwood x998 ∑ PPI 1600.4 ∑ CDT HD-6 + HD-100 ∑ CDT EX-530 ∑ DVC 10"
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Old Fri, Oct-12-2018, 07:26:56 AM   #6
mrgizmo04
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Default Re: Oil leak cpv

Quote:
Originally Posted by TboneM3 View Post
Or Vanos accumulator.
Very good point, T!

OP - check/follow the high pressure line from vanos unit to where it "disappears" around the bank 1 headers. Those lines are known to bust/leak.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Fri, Oct-12-2018, 03:29:15 PM   #7
toy4to
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Default Re: Oil leak cpv

I just had this same issue with my chain tensioner. Remove the plastic piece on the passenger side engine bay and look at the area above your AC compressor. Look for any oil around that area. If there is, either tighten the chain tensioner, or replace the gasket. Note that there have been a lot of stories of people crossthreading this chain tensioner when they put it back in.

This link may help you. The square drive socket cap made the job soooo easy. A $4 tool.

http://www.m3forum.net/m3forum/showthread.php?t=433414



Quote:
Originally Posted by mrgizmo04 View Post
From what you are describing, I'm not sure it's the cpv in your case...

All over headers - which cylinders, bank 1 or 2 collectors? CPV is basically just under cyl#6, very close to the bell housing.

All over front control arms and brakes...those are too far forward of the CPV location to be the CPV...and the brakes are pretty isolated in wheel well, especially if you have all the undertrays intact.

My guess is the chain tensioner, that sits under cyl#1 and more inline with the area you are describing...

Get some paper towels and start dabbing all around (once car is cool so you don't burn yourself).

Sent from my SM-G950U using Tapatalk

Last edited by toy4to; Fri, Oct-12-2018 at 03:51:00 PM.
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Old Fri, Oct-12-2018, 03:38:49 PM   #8
TboneM3
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Default Re: Oil leak cpv

I love those socket caps! Made swapping the tensioner, and other stuff, so much easier. And it's not like I don't have lots of different tools; the caps just make life easier in some situations.
__________________
/// 2004 SilberGrau M3 ∑ Coupe ∑ 6MT ∑ slicktop ∑ manual seats ∑ zero options ∑ JOURNAL
-NA S54-


∑Evolve-R Alpha N ∑ Evolve CSL CF Airbox ∑ Eventuri Scoop ∑ Supersprint V1 stepped 63mm ∑ SS V1 S pipe 63mm + 200 cell HFC ∑ OE sect 2 60mm ∑ SS Sport 60mm
∑Besian ∑ RE pullies/fan delete ∑ WPC rod bearings ∑ GroundControl S/A (Koni/Eibach 440/550) + tall RSMs ∑ TMS Camber & Subframe plates ∑ SPC Adj alloy rear camber arms
∑RE Trans Mounts ∑ AKG poly SUB/DIFF 95a ∑ SDW RTAB ∑ Weighted ///M knob + UUC DSSR + delrin carrier bush ∑ OE CSL trunk ∑ APEX 75mm Studs
∑Sportline 8S 18"x8.5/9.5" ∑ MPSS 245/275 ∑ Brembo 996 36/40 345mm CSL Textar FF & 28/30 328mm CSL ATE "D738" FF ∑ CM brackets & ss/teflon lines
∑Pioneer DEH-80PRS ∑ Eclipse PA5422 ∑ CDT HD-6 + WS-100i ∑ CDT EX-530 ∑ 8" Kicker

DD/Beater: 1999 Civic LX - Kenwood x998 ∑ PPI 1600.4 ∑ CDT HD-6 + HD-100 ∑ CDT EX-530 ∑ DVC 10"
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Old Tue, Oct-16-2018, 02:43:55 AM   #9
josee_alvarenga
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Default Re: Oil leak cpv

thanks a lot guys! i really appreciate the links you all sent me. itís not the CPV, i just took out the tensioner, checked the washer and it seemed perfectly fine with no defections.... couldnít fit a torque but tightened it quite hard with the open end wrench i was using. not sure if i should have ordered a new washer either way but tomorrow iím gonna check the vanos pressure line to see if thatís the culprit.


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Old Tue, Oct-16-2018, 02:49:20 AM   #10
josee_alvarenga
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Default Re: Oil leak cpv

used UV dye and dabbed my fingers on TCT, UV light showed green. ran my fingers far down oil pressure line and fingers turned green as well under UV light. although oil somehow could have managed to find its way on that pressure line so that test isnít tooo accurate... is there anything else in that region i should check??


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Discussing Oil leak cpv 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)