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BMW Repair/knocking at engine start up
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Question
There's a knocking in the engine at start up, then a few seconds later it smooth's out. What could this be, i have a 1985 535i bmw. Please help
The first step would be to check and see what the oil pressure is,being that vintage it probably has many miles on it if your not the original owner than you don't know the maintenance that has been done. The lower knocking noise maybe excessive clearance in between the bearings and the crankshaft(engine overhaul time)or have the valves been adjusted? they too make a noise being adjustable and having excessive clearances will cause a noise until oil pressure gets to the rockers.
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Don Berlan
Expertise
ASE Master Mechanic for 25 years. Can help with all aspects of BMW repair. I especially enjoy driveablity problems, mechanical or electrical.
Experience
I have been an ASE Master Mechanic for 25 years.I have worked in many dealearships although BMW's are my favorite.I now have my own shop,specializing in BMW's.I have autocrossed and even gotten into mud running with my 4x4.(I am NOT a teacher and don't claim to know everything about the cars I never see.I hope to help you with your repairs and do expect some knowledge on your side.)
Education/Credentials
CMVTI, Auburn Maine
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