There are plenty of posts about noises the m42 makes. This is just a re-assuring post to those that have a similar noise/symptom and are debating on resolution.
1991 318is m42 (20w-50 oil).. 204kmi, machined head some 30kmi ago (previous owner) status of timing components unknown.
Symptom: If the car sat over night, the next morning the car would start up and run with a... knocking, clinking, diesel, chain, type sound. On acceleration the noise would also increase in frequency (was leaning towards a bad lifter). After 2-8 minutes the noise would go away completely.
Inspection: After researching on r3v and http://e30world.com/engine/BMW-E30-M...er-replacement i found that the timing chain tensioner was hydraulic. Reading into it, the part was upgraded (11 31 1 743 187). Pulled mine out to find the original design. It looked fine but decided i would spend the $40 to start with prior to the $360 to replace the timing system.
Conclusion: Soaked new tensionser in assembly lube, installed... (lots of noise increase rpms to build oil pressure) the noise is gone and the m42 runs quiet as it should.
After much research the best price i found was through my local CarQuest, also known as WorldPac.
1991 318is m42 (20w-50 oil).. 204kmi, machined head some 30kmi ago (previous owner) status of timing components unknown.
Symptom: If the car sat over night, the next morning the car would start up and run with a... knocking, clinking, diesel, chain, type sound. On acceleration the noise would also increase in frequency (was leaning towards a bad lifter). After 2-8 minutes the noise would go away completely.
Inspection: After researching on r3v and http://e30world.com/engine/BMW-E30-M...er-replacement i found that the timing chain tensioner was hydraulic. Reading into it, the part was upgraded (11 31 1 743 187). Pulled mine out to find the original design. It looked fine but decided i would spend the $40 to start with prior to the $360 to replace the timing system.
Conclusion: Soaked new tensionser in assembly lube, installed... (lots of noise increase rpms to build oil pressure) the noise is gone and the m42 runs quiet as it should.
After much research the best price i found was through my local CarQuest, also known as WorldPac.
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