![]() ![]() Also, with a perfectly ground flat sanding block, imperfections in the sealing surface can be easily seen and usually can be corrected or eliminated. At Autobahn we rarely use surface preparation pads or discs they are too aggressive (even the fine or soft rubber ones) and end up removing surface material and rounding off the edges of the surface. all technicians are instructed to clean parts with mineral spirits in a parts washer first, then all sealing surfaces are cleaned by sanding with 440 grit wet or dry sand paper in a figure 8 pattern. Also, great care must be taken to ensure the parts are thoroughly cleaned. ![]() We also use a small amount of sealant in the corners of the gaskets to ensure proper sealing. The sealing strips are made of metal that is laminated with a light coat of rubber-like sealant. BMW now offers sealing strips to better seal this surface. Part of the labor for the cover is overlapping (removing the intake manifold), but replacing the cover itself is not included in the front cover time.įrom the factory, the timing cover has just a very light sealant on the surface where the coolant passes from the cover to the engine block. ![]() The cover is not re-sealable and should be replaced. There are also other labor operations that should be done at the same time as the timing cover that are not included for example, replacing the valley block cover. Alldata repair information service shows the timing cover remove and replace time at 30.6 hours. Most manuals seem to estimate the repair time around 30 hours. The cavity and weep whole keep the engine coolant from leaking into the engine oil that would probably lead to engine failure if not detected in time. BMW engineers were smart enough to know their design for sealing the water passage from the front timing cover to the engine block would probably not last forever, so they made provisions for a cavity to catch the coolant leak and eject it through a weep hole at the upper right corner of the timing cover. What you probably have is a front timing cover to engine block coolant leak. If you have a BMW model 740i, 740il, 540i, 745i, or 745il with the 4.4 liter V8 (M62) engine, and you have a coolant leak from a small weep hole in the front timing cover, be very careful it is not misdiagnosed as a water pump or valley cover problem. We have seen this problem several times and it is usually misdiagnosed or not repaired correctly. ![]()
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