This is one of the best videos. If you have a leaking o-ring on the vacuum pump it will slowly drain your oil pan. And it also is one of mystery leaks that no one can determine. It's even hard to see with a folded mirror. Also careful not to trash the threads of the bolts and get the right O-rings for replacement.
Your videos are great! They give me the confidence to go into a job with forward knowledge, almost like I've done it before. Also you are one of few that give in depth information on the N42 engine which I struggle to find any manual or information on. I note at the end you say to torque nuts to 9nm, is this the BMW spec? If so would you mind sharing where you get your info from as I also like to do things by the book but sadly I cannot find 'the book'. 😊
Sir please help me i attempted this process although my vacuum pump seems stuck to the motor now looking at your video, is see i might have to take the valve cover off in order to get a better angle to knock it or tap it out with some force, your input will be highly helpful please.
Useful to see the vacuum pump seal replacement, thanks. I had this on my old E46 and a similar issue now on my E90. What model of torque wrench did you use in the confined space to tighten the 3 bolts back on to the engine? Are the torque settings estimated or is there a source for this information? Thanks.
Is it possible that these seals if bad could cause stiff brake pedal or is it whole pump bad bc i didnt get any suction from end of hose that goes to that booster?
It is common for the vane inside the pump to break as it is fragile plastic resulting in loss of vacuum and stiff brake pedal, worst case is the pump seizing up and breaking the end of the exhaust camshaft.
Ive been told that oil has travelled along the vacuum hoe to the booster, creating problems in my booster. Why would this happen, would it be because the smaller of the seals is leaking. my larger seal on the plate outside is not leaking and i am not getting oil down on my exhaust etc
The large seal seals the pump so it can create the vacuum for the brake booster. There is always some oil inside the vacuum pump for lubrication so it's normal to have a small amount of oil residue in the vacuum hose that goes to the booster. If the small seal is bad, then it's a good chance that the large outside seal is bad also... If the vacuum is decreased, it could mean more oil in the booster hose and weaker brake boosting. But I don't have any direct experience with your issue so I cant give you a definitive answer.
Hello Friend! I was done it seal replacement 2 time in lest 2 months, first time I was try with silicon to fit, secound without, it take a long for a one month and leaks again, in both try I have used Erling set of Rings. How is by you, how much it could be witout leaks after replacement?
Hi, are you sure that the vacuum pump seals are leaking? Sometimes it's the valve cover gasket. There are some sharp corners near the rear that need a small amount of silicone bead so that the valve cover gasket seals properly. If it leaks at the back, then the oil will pool at he bottom of the vacuum pump.
Do not change the seals, there is also an internal seal that is bad and cannot be changed, also the new seals won't really last. It's much better if you buy a new one.
I'll have to disagree with you there. What internal seal do you mean? There are only 2 seals and you can replace both, they should last another 5 years or so...
![Replacing vacuum pump seals - BMW N42/N46 Chain Rail Replacement [PART #7]](/img/logo.svg){kind=logo}
