Herbmiester 909 Report post Posted April 2, 2022 So the Vacuum pump on my X5 40D (N57) is failing. I checked vacuum at the block by removing the tube that goes into the block and there was no vacuum. So it looks like I have a gummed up vacuum pump. Probably carbon inside because after the engine has warmed up the pump frees itself up and I get vacuum again. Looking at my options I could drop the sump and see if the vacuum pump could be serviced. A left field alternative is to use an electrical aftermarket pump and have it certified. I have fitted an electric pump to a friends big cam V8 Chev and it seemed to work quite well. Before I go down that route I am curious if anyone has serviced an N57 vacuum pump? Can it be done? Time is ticking away here so if you have any info please let me know ASAP. Thanks Quote Share this post Link to post Share on other sites
Lubed 55 Report post Posted April 3, 2022 Have you had any oil pressure issues? The vacuum pump and the oil pump are a combined unit and there are rare reported cases of the pump drive failing, maybe worth inspecting. 1 Quote Share this post Link to post Share on other sites
Herbmiester 909 Report post Posted April 3, 2022 No oil pressure issues yet. I have decided I am going to take the sump off and have a closer look. Quote Share this post Link to post Share on other sites
