Kansas E46 Fanatics listen up!

Wow... Ok I guess 'cpv valve' is kinda redundant. And using a regular flat blade bit was not working for me.

Originally Posted by NoMoreIdeas

Wow... Ok I guess 'cpv valve' is kinda redundant. And using a regular flat blade bit was not working for me.

Well, I wasnt being sarcastic.

Learn me what a CPV is.

Oh.... Lol

Constant pressure valve. It's a valve on the exhaust side of the block behind the header. The o ring gets very hard and leaks oil over time. The valve is a few hundred $$ but the oring is like $4.

Is it part of the CCV system? Or is it in the exhaust? Or am I totally lost here?

Originally Posted by NoMoreIdeas

Oh.... Lol

Constant pressure valve. It's a valve on the exhaust side of the block behind the header. The o ring gets very hard and leaks oil over time. The valve is a few hundred $$ but the oring is like $4.

Mine was leaking a bit so I bought a new one. I tried to get the old one out with no luck so I just let it leak.

Found it. Still not sure what system its part of, the oil system maybe?

Part 10 below, right?



No. Description Supplement Qty From Up To Part Number Price Notes Photo
01 Set of covers 1 11142247867 $94.60
02 Gasket Steel 1 11141432240 $3.10
03 Hex bolt with washer M6X25-Z1-ZNS 4 07119900249 ENDED
03 Hex bolt with washer M6X25-ZNNIV SI 4 07119905400 $0.65
04 Hex bolt with washer M8X28-Z1-ZNS 2 07119902105 ENDED
04 Hex bolt with washer M8X28-ZNNIV SI 2 07119905530 $0.71
05 Shaft seal 90X110X12 1 11142249533 $58.96
06 Dowel D=10,5MM 2 11121726238 $1.62
07 Covering plate 1 07/2007 11141734019 $11.15
07 Covering plate 1 11147838044 $11.15
08 Oil Spraying Nozzle 6 11427830770 $19.90
09 Fillister-head screw M6X16-ZNS 6 07119901438 ENDED
09 Fillister-head screw M6X16 6 07129905536 $0.64
10 CONSTANT PRESSURE VALVE 1 BAR 1 11111318185 $41.25
11 Ping Sensor 3 03/2007 12147830788 ENDED
11 Ping Sensor 3 12147839167 $25.18
12 Hex bolt M8X30-ZNS 3 10/2006 07119901170 ENDED
12 Hex bolt M8X30-ZNNIV SI 3 06/2004 07119905531 ENDED
12 Hex bolt M8X30-8.8-ZNS3 3 07119902901 $0.25
13 Speed sensor 1 12147830789 $83.23
14 O-ring 18X1,2 1 12141402705 $1.07
15 Fillister-head screw M6X14 1 11427831375 ENDED
16 Gasket Set Engine Block Asbesto Free 1 05/2003 11117831919 ENDED
16 Gasket Set Engine Block Asbesto Free 1 11110302722 $267.70

Originally Posted by PerkM3

Mine was leaking a bit so I bought a new one. I tried to get the old one out with no luck so I just let it leak.

That's why I made a tool

Once I made it, it was really easy to get out and was pretty quick to change.

Oh weird, when I had the new buyer inspection done they said it needed replaced and were going to charge me $600!

oh I know that. its that espencive? wow. yeah I'm pretty sure its oil related. does it go to the vanos maybe?

ruben did you see her post about the tiffany and co wedding gift thing?

nvm idk how this stuff works. registry.

Andy yea, you see the rest of it?

From what I remember, it keeps a constant static pressure of oil supplied to the VANOS oil pump. I could be wrong though.

Either way, its a very common problem. My O-ring was so dried out, it snapped in half when i tried to flex it.

The CPV is not part of the oil system. It's purpose is to keep the internal block pressure constant. Thus the name Constant Pressure Valve. It's just a ball valve and a spring.

Edit: Very Very common problem. Hell I replaced by rear main seal and oil pan gasket when the oil was really leaking from the CPV.

Oh damn. Maybe I should check mine...

Originally Posted by Andy2108

Oh damn. Maybe I should check mine...

It's really not that big of a deal from a safety/life of the car standpoint. Most of the time it's just a leaky O-ring and it's not like it leaks a ton. My SS headers were in the way of changing mine. I tried all kinds of tools.

Internal block pressure? Pressure of what? Oil system, coolant system, crankcase?

Originally Posted by Rubenk

Internal block pressure? Pressure of what? Oil system, coolant system, crankcase?

It's also known as the oil pressure relief valve so I guess I was wrong by saying it's not part of the oil system but it's really not in my opinion. I guess I meant it doesn't assist in oil circulation, it's just a valve that opens as pressure increases to maintain a constant pressure which was determined desireable by the BMW engineers.

Gotcha, so it bypasses excess pressure.

Originally Posted by Rubenk

Gotcha, so it bypasses excess pressure.

Exactly.