BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Valve Seats


The valve seats should be inspected in the same manner and at the same time as the valves. If the valve seats need to be replaced, refer the job to a reputable machine shop. Seat replacement involves heating the head to as much as 300° (150°) and chilling the seats to as low as -240° (-150°), not a job for the do-it-yourself. The seat would also need to be machined after installation. Bmw valves and valve seats tend to be very rugged and long wearing. Usually a valve job will return the seats to usable condition.