Overview
The story
BMW built the 1.8L M42 from 1989 to 1996 and replaced it with the M44 from 1996. A published reference
Specs
Versions
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1.8L M42 A published reference
1,796 cc, 84 × 81 mm. 134 hp in the E30, 138 hp in the E36 · 1989–1996
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1.9L successor M44 A published reference
Figures
- Block and head: Cast-iron block, aluminum head A published reference
- Valvetrain: Twin overhead cams driven by a chain with a hydraulic tensioner, four valves per cylinder A published reference
Watch out
Faults owners and the press report, and how to spot each one.
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Early timing chain wear M42
One source so far
Check: Listen for chain rattle at start-up and ask whether the guides were updated.
Early engines wore their timing chains, and BMW updated the tensioner, guides and lower chain case. From September 1993 a nylon guide rail replaced the idler gear, and its retaining bolt could break away. A published reference
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Leaking profile gasket M42
One source so far
Check: Look for coolant in the oil under the filler cap.
The early gasket between the lower chain case and the head failed, letting coolant into the oil and ruining main bearings. BMW updated the gasket and offered warranty repairs. A published reference
Owning
Maintenance
No service schedule is added yet.
What owners and buyers say
No source singles out a version yet, for good or bad.