|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
N52B25 high oil consumption
|
|
07-05-2019, 03:02 PM | #24 | ||
Private
11
Rep 63
Posts |
Quote:
Quote:
Could you give some advice on what special tools do you use for this job, what are we going to need? Is a universal valve stem seal kit good for taking off the springs and putting them back on, for example? If you have a link that would be awesome Thank you so much for your help dear sir Edit: could either of the 2 attached tools work? Last edited by n00b0rKa; 07-05-2019 at 04:39 PM.. Reason: Added attachments |
||
Appreciate
0
|
07-05-2019, 04:57 PM | #25 | |
Second Lieutenant
100
Rep 237
Posts |
Quote:
https://stmtuned.com/products/blue-p...ing-compressor This the tool we have in our workshop. It is a bit of pain to use but it does the job. You will also need all the timing tools to re time the camshafts and VANOS. You can usually hire the tools you need instead of buying them. Not sure if you can in your country though. If you have never done any engine work before, it may be a good idea to get it done by a qualified mechanic. |
|
Appreciate
0
|
07-06-2019, 06:18 AM | #26 | |
Private
11
Rep 63
Posts |
Quote:
|
|
Appreciate
0
|
07-06-2019, 03:46 PM | #27 | |
Second Lieutenant
100
Rep 237
Posts |
Quote:
https://www.newtis.info/tisv2/a/en/e...mshaft/48rUbI5 https://www.newtis.info/tisv2/a/en/e...mshaft/Dp260dl |
|
Appreciate
0
|
07-10-2019, 04:57 PM | #28 | |
Private
11
Rep 63
Posts |
Quote:
Also, my brother recorded a footage of blue smoke in different situations and some borescope views of my cylinder walls. I think the black oil seeping in from the top region is a clear sign that valve stem seals are leaking. Thank you so much for your help, nbK |
|
Appreciate
0
|
07-10-2019, 06:11 PM | #29 | |
Second Lieutenant
100
Rep 237
Posts |
Quote:
Last edited by N52bigblock; 07-10-2019 at 06:57 PM.. |
|
Appreciate
0
|
07-11-2019, 12:04 AM | #30 |
Private
11
Rep 63
Posts |
The whole CCV system was replaced 1 week ago but the issue persists, so that's why I don't think none of those hosed are blocked. Some very light scoring can be seen on the cylinder walls but it's nothing serious, and if you watch that video, you can see the oil actually seeping in from the top of the cylinders.
|
Appreciate
0
|
07-11-2019, 03:28 AM | #31 | |
Second Lieutenant
100
Rep 237
Posts |
Quote:
|
|
Appreciate
0
|
07-11-2019, 04:36 PM | #32 | |
Private
11
Rep 63
Posts |
Quote:
Regarding the tools, there is this one for the valvetronic intermediate springs, do I need this? https://www.toolsource.com/bmw-tools...-p-149212.html In the instructions you gave for removing/installing the camshafts, they give a list of special tools which includes a torque measuring dial and cylinder head expanding kit. (https://www.newtis.info/tisv2/a/en/e...mshaft/5PbhIvE) Are these also absolutely necessary besides the valve spring compressor and the timing tool? Thank you very much once again, nbK |
|
Appreciate
0
|
07-12-2019, 12:58 AM | #33 | |
Second Lieutenant
100
Rep 237
Posts |
Quote:
|
|
Appreciate
0
|
07-15-2019, 07:40 AM | #34 | |
Private
11
Rep 63
Posts |
Quote:
Thanks once more! Last edited by n00b0rKa; 07-16-2019 at 03:14 AM.. |
|
Appreciate
0
|
07-17-2019, 04:02 AM | #35 | |
Second Lieutenant
100
Rep 237
Posts |
Quote:
|
|
Appreciate
0
|
07-21-2019, 02:40 PM | #39 |
Private
11
Rep 63
Posts |
This is the seal of the second valve of the first cylinder. I noted the differences in the diameter of the holes, and this cylinder was showing the fewest signs of oil consumption.
|
Appreciate
0
|
07-22-2019, 02:42 AM | #40 |
Second Lieutenant
100
Rep 237
Posts |
|
Appreciate
0
|
07-22-2019, 04:15 PM | #41 |
Private
11
Rep 63
Posts |
The rubbed is almost rock solid also, so I suspect this was the issue.
About the experience we had so far: We almost lost a gland follower because the tool slid off the valve spring, and had to transform the valve spring compressor a bit by drilling extra holes. The old seals came off really hard but we realized that twisting them gets them loose. We managed to change 12 in an afternoon, so I would not say it's an easy job, but it can be definitely done at home. Also found a video for a DIY tool to replace the intermediate spring compressor, it was really easy to take the springs off with it, will see how it works for the mounting. (https://www.youtube.com/watch?v=5ieUmpVxNfc ) |
Appreciate
0
|
08-02-2019, 10:01 AM | #42 |
Private
11
Rep 63
Posts |
I'm back with some updates: the engine is running fine, with some lifter tick that is slowly getting better, however the oil consumption remains almost unchanged: it destroyed 750 ml of oil during a 300km trip.
We suspected the piston rings being the issue so we filled the cylinder with different kind of detergents, such as injector cleaner or seafoam, but nothing really seemed to help. I'm really starting to get desperate here... Edit: I had to top up 2 times with 1-1 litre of oil during a 700km trip, so basically the oil consumption is worse now than before replacing the valve stem seals Last edited by n00b0rKa; 08-03-2019 at 08:42 PM.. |
Appreciate
0
|
08-10-2019, 10:42 PM | #43 |
New Member
0
Rep 15
Posts |
I definitely empathize with the OP as I've been in practically identical situation.
2 years ago I bought a used e60 525i euro specs with N52B25 engine which was eating oil like popcorn. I since replaced almost everything possible like PCV, valve gasket cover, oil pan gasket, anything rubber and gaskets in the the engine together with head cover gasket and valve stem seals. Yet the engine, despite runs very smoothly, still eats oil though at a much lesser extend. I find it only eats oil whenever I go WOT with oil burning smell goes into the cabin. the other thing is the car is having some weird stalling when I accelerate from a turn or idling for 2-3 minutes, feeling like a vacuum leak. I tried compressor test and 4 out of the 6 engines are terrible but i dont know how the car can still keep up with running :-) This leads me to the very last resource of the issue of the piston ring and the piston itself. Given the infamous design flaw of the first version of N52 on the piston ring design, I am tempting to bore out the cylinder and replace the piston/bearing of the N52B30 to squeeze more power out the engine as another member confirmed that MSV70 DME can run his swapped n52B30 without problem. |
Appreciate
0
|
08-12-2019, 02:02 AM | #44 | |
Private
11
Rep 63
Posts |
Quote:
Maybe you know that oversized pistons are available for the N52B25 engine (p/n: 11257561845), although I've not done much research on this subject. Another option would be an engine swap, which has been suggested for me multiple times. Best of luck, I hope we both manage to make our engines healthy again |
|
Appreciate
0
|
Bookmarks |
Tags |
325i, consumption, n52b25, oil |
|
|