This article describes how to check and eventually adjust the throttle valves on an M635CSi. This is by no means a straightforward procedure, requiring more than a weekend's hard work and at least some special tools, like a sliding vernier caliper (measuring accuracy of tenths of millimeters or better), a dial gauge able to measure disposition with an accuracy of hundredths of millimeters  plus mounting material, and a vacuum synchrotester (like Carbtune). For an overview of special tools and alternatives, check my other post: BMW special tools This procedure is not un-doable, but if your engine is running fine in idle, and responding nicely to the throttle, it's probably enough to just clean and lubricate the moving parts on the throttle bodies (shaft, bearings, pushing rods). Abbreviations: - TB Throttle Body - ICV Idle Control Valve 1) REMOVE ACCUMULATOR Start off by removing the Accumulator, as described in Overhauling the accumlator on an M635CSI 2) REMOV

This article shows how to overhaul the intake manifold on an e24 M635csi. This may be needed in case the o-rings and rubber sleeves (parts #8 and #5 in the picture) show signs of wear, or if your accumulator needs inspection (rough idling, because of additional air being sucked in through a crack....) or if you simply want to clean the intake necks. Actually I overhauled the complete intake including throttle bodies, idle control valve and part of the cooling circuit, so the pictures will not always show an accurate situation. This post should be read in conjunction with:  xxx which shows the adjustment of the throttle valves. yyy

To celebrate this year's 40th birthday of M-Power, a small group of M-thusiastics took a small roadtrip through the beautiful south of Holland and part of Belgium. This was also an excellent opportunity to meet some people I've been in contact with for over a year now on internet, but never met in person. Given the fact that we're approaching the end of October, the weather was extraordinarily beautiful, 22 degrees C, sunny and no clouds whatsoever. Autumn had coloured the landscape in all shades of the spectrum between red and yellow, its shine emphasized by the sun. Seldom have I seen such overwhelmingly beautiful scenery. We met at a restaurant in Teuven (B). Besides my e24-M635CSi, Raymond and his father joined with an extremely well-kept lachs-silber e28-M5. Han and his brother Martijn arrived with their e34-M5 Station and Robert brought his e34-M5. Don't let this piece of art mislead you, Robert's S38 may look brandnew, but this mechani

This article provides a step-by-step procedure to overhaul the M635 brake calipers i.e. clean the pistons and install new o-rings and rubbers. The article may also be of use when replacing brake discs or pads. I got to this exercise after experiencing a noisy trembling at the front, at speeds above 90 km/h (which occur more often than not.....). Jacking the front up revealed that the left wheel could hardly be rotated at all by hand. I took another test drive and measured the temperature of all discs, which was 50 degrees Celsius for the rear, 110 for the right front but 160 for the left front disc..... 1) Preparation: - overhaul sets (item 7 in the picture, dustcovers, springs and o-rings) - optionally a new brake line kit. I used steel inforced brake lines - ATE brake cilinder paste (Bremszylinder pasta) - 7mm and 19mm socket wrenches - 14mm open wrench - prying rod (an 8 inch screwdriver will do) - rubber cap to top the brake line - hammer and punch (to drive out the sp