The M3cutters - UK BMW M3 Group Forum
 

Go Back   The M3cutters - UK BMW M3 Group Forum > M3cutters Garage > Faults, Fixes and Solutions



Reply
 
Thread Tools Display Modes
Old 15th May 2018, 10:24 PM   #1
Dan320is
On the path
 
Dan320is's Avatar
 
Join Date: Aug 2017
Location: Suffolk
Posts: 113
Car: 2004 E46 M3
Default E46 M3 oil leak issue, where's it coming from?

Hi guys, I've only had my car since March and it feels like I'm chasing my tail with oil leaks and other issues.

A reputable specialist has just changed the rod bearings and bolts along with associated gaskets etc and there's an oil leak neither myself or the specialist can solve.

The leak is in the area below the exhaust manifold right at the rear below the cam sensor.

So far we've changed the cam sensor O-Ring, the CPV seal and the rocker cover gasket whilst the valve clearances were done.

Has anyone whose had the S54 in enough bits shed any light? Thank you.

Hopefully the photo below will show the area concerned.

https://flic.kr/p/278kedU
Dan320is is online now   Reply With Quote
Sponsored links
Old 16th May 2018, 05:59 AM   #2
timotei198
A mere Chipper
 
timotei198's Avatar
 
Join Date: Aug 2017
Posts: 40
Car: E46 M3
Colour Combo: Silver Grey
Default

Rear crankshaft seal?
timotei198 is offline   Reply With Quote
Old 16th May 2018, 10:48 AM   #3
Dan320is
On the path
 
Dan320is's Avatar
 
Join Date: Aug 2017
Location: Suffolk
Posts: 113
Car: 2004 E46 M3
Default

Quote:
Originally Posted by timotei198 View Post
Rear crankshaft seal?
That's what I thought but the leak is too high for that, I put a scope into the bell housing and it appears dry in there.
Dan320is is online now   Reply With Quote
Old 16th May 2018, 12:36 PM   #4
BMM3
Rocking a new hat
 
BMM3's Avatar
 
Join Date: Mar 2013
Posts: 471
Car: 2003 bmw e46 m3 coupe
Colour Combo: silver/black
Default

Oil feed to the cylinder head is on that side at the very back of the engine, sometimes itís possible to get a light misting of oil in this area which my of mounted to more over time.

How long does it take to see the leak again once itís been cleaned off?
BMM3 is offline   Reply With Quote
Old 16th May 2018, 04:24 PM   #5
Dan320is
On the path
 
Dan320is's Avatar
 
Join Date: Aug 2017
Location: Suffolk
Posts: 113
Car: 2004 E46 M3
Default

Quote:
Originally Posted by BMM3 View Post
Oil feed to the cylinder head is on that side at the very back of the engine, sometimes itís possible to get a light misting of oil in this area which my of mounted to more over time.

How long does it take to see the leak again once itís been cleaned off?
Ah, that's handy. A one hour drive will produce a decent amount of oil in the reinforcement plate.
Dan320is is online now   Reply With Quote
Old 16th May 2018, 05:20 PM   #6
cossie1
Achieved official socks
 
cossie1's Avatar
 
Join Date: Jul 2010
Posts: 3,974
Car: 2002 M3 Coupe
Colour Combo: Jet Black / Black
Default

I would get them to double check the CPV is tight.

When I replaced mine, it went tight, but I noticed that it wasn't in the same position as the one I removed.

So I had another go at it, and it turned another 1/8 of a turn which put it in the position of the original one, and you couldn't force it to go anymore than that either.
cossie1 is online now   Reply With Quote
Old 16th May 2018, 06:25 PM   #7
Dan320is
On the path
 
Dan320is's Avatar
 
Join Date: Aug 2017
Location: Suffolk
Posts: 113
Car: 2004 E46 M3
Default

Quote:
Originally Posted by cossie1 View Post
I would get them to double check the CPV is tight.

When I replaced mine, it went tight, but I noticed that it wasn't in the same position as the one I removed.

So I had another go at it, and it turned another 1/8 of a turn which put it in the position of the original one, and you couldn't force it to go anymore than that either.
I'll give the CPV a further but careful tweek.

The leak is coming from above that position though, I think my next step is to remove the rocker cover and check how the new gasket is sitting.
Dan320is is online now   Reply With Quote
Old 16th May 2018, 11:12 PM   #8
Rick M3
Achieved official socks
 
Rick M3's Avatar
 
Join Date: Apr 2013
Location: Preston
Posts: 8,204
Car: 2002 M3 Convertible
Default

I'll have to dig out the receipt, but Redish traced mine back to a cam chain follower bolt (or something)
Rick M3 is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes



All times are GMT. The time now is 11:42 AM.


This website uses cookies. By continuing to use the site you are agreeing to our use of cookies. To find out more about the cookies this website uses, click here.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © 2007 - 2018 M3cutters. All Rights Reserved.