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E85 / E86 Z4 (2003-2008)
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  #1  
Old 10-03-2014, 12:22 PM
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bwillia bwillia is offline
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Valve adjustment

Anybody else had their valve adjustment performed lately. The tech made it sound like this is a real pain in the A*#. He had to scour dealerships for the right shims. I'm really surprised that this engine isn't hydraulic valve train. Pretty old school.
Oh and it was expensive!!
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Old 10-03-2014, 02:29 PM
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dc_wright dc_wright is offline
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It's a tedious job because you have to rotate the engine to the right position 12 times and measure and place the correct shim thickness 24 times. And with respect to old school, very few high rpm engines have hydraulic lifters. The ability of a hydraulic lifter to maintain zero clearance without over pumping at high rpms or collapsing a idle rpms is limited, plus the added mass of the hydraulic lifter makes valve float more likely at high rpms.
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Old 10-03-2014, 02:48 PM
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bwillia bwillia is offline
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Quote:
Originally Posted by dc_wright View Post
It's a tedious job because you have to rotate the engine to the right position 12 times and measure and place the correct shim thickness 24 times. And with respect to old school, very few high rpm engines have hydraulic lifters. The ability of a hydraulic lifter to maintain zero clearance without over pumping at high rpms or collapsing a idle rpms is limited, plus the added mass of the hydraulic lifter makes valve float more likely at high rpms.
Ahh! Now that you say that I recall that little subtlety. This motor is definitely a thoroughbred, semi race motor. Thanks
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Old 10-04-2014, 04:45 AM
STIHLBOLTS STIHLBOLTS is offline
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Best thing to do is find a Shim set. It will be worth the investment if you intend to keep the car. http://www.ecstuning.com/News/BMW_S5...ITS/ES1893848/

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Old 10-04-2014, 05:43 AM
kalali kalali is offline
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Quote:
Originally Posted by bwillia View Post
Anybody else had their valve adjustment performed lately. The tech made it sound like this is a real pain in the A*#. He had to scour dealerships for the right shims. I'm really surprised that this engine isn't hydraulic valve train. Pretty old school.
Oh and it was expensive!!
Are you talking about the vehicle you've listed - 08 335xi? I thought only S54 motors needed that.
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Old 10-06-2014, 02:38 PM
Pierce Pierce is offline
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I believe you are correct. One thing is for sure, S54's require valve adjustments.


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Old 10-06-2014, 02:40 PM
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bwillia bwillia is offline
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Sorry for the confusion. I just purchased a 2006 M roadster with the S54 engine to add to the collection. I'm getting all of the maintenance done on it since it has 55K miles on it.
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Old 10-07-2014, 02:23 PM
Pierce Pierce is offline
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Excellent idea!!!


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