Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1992325IS AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE - REPAIR (M50)OVERHAULCYLINDER HEADVALVE SEATS
1992 BMW 325is Automatic
Valve Seats
1992 BMW 325is AutomaticSECTION Valve Seats
- Machine valve seats using Valve Seat Lathe (00-3-520) and Valve Seat Reseating Set (00-3-580), following instructions supplied with tools. After machining valve seat angle, produce valve seat diameter "B" and valve seat width "D" by machining correction angles "D" and "E" and countersinking "C". See Figure. See VALVE SEAT CORRECTION ANGLES table.
- If more than 0.008" (0.20 mm) is machined off valve seat, install a valve with a thicker valve head. See OVERSIZE VALVES AVAILABLE table to determine available oversize valves.
OVERSIZE VALVES AVAILABLE (1)
| Standard Stem Size 0.0" (0.0 mm) | 1st Stem Oversize +.004" (+.10 mm) | 2nd Stem Oversize +.008" (+.20 mm) | ||
|---|---|---|---|---|
| Valve Head Thickness | +.008" (+.20 mm) | +.016" (+.40 mm) | ||
| Machined Valve Seat In Excess Of | +.008" (+.20 mm) | +.016" (+.40 mm) | ||
| Identification On Valve Stem | 0.1 | 0.2 | ||
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RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.