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Old 01-26-2013, 08:49 AM   #44
MTrider16
Ridin' in MT
 
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Joined: Oct 2006
Location: Eastern Montana
Oddometer: 1,453
Intake new .23-.33mm old was 18-26
exhaust new .30-.41mm old was .27-.35

New .009"-.013" Old .007"-.010"
New .012"-.016" Old .011"-.014"

I had to convert he dimensions to get a "feel" for this change.

Ditto on folks comments that BMW thinks there is more seat to face wear than valve train wear in the time interval between valve adjustments. Its a balancing act. If the valve adjustment gets too loose, the open and close ramps on the cam are not used and the valve slams shut on the seat. Too tight and the valves get to hot from not closing properly on the seat.

It seems to me that you can use the old spec and just check them more often, or use the new spec and standard interval. Also if you can record your measurements, you can customize your own adjust interval.

I'm not sure why you think BMW would publish the specs. Manufacturers think end user are incapable of performing maintenance and only Factory certified technicians should work on the engines. European companies are worse in this regards than US companies, but even US companies are seeing the profit that can be gained by keeping maintenance under their own licenced franchise roofs.

David
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Mountains, Moose, and Miles: a Montanan's Alcan Highway Story
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MTrider16 screwed with this post 01-26-2013 at 08:55 AM
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