What happens to the Valve clearance with time? - BMW Luxury Touring Community
 
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post #1 of 6 Old Jan 12th, 2011, 6:42 pm Thread Starter
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What happens to the Valve clearance with time?

Just curious, what happens to the valve clearance with time and wear.
Does the gap increase or decrease with time.
My logic says that the gap should always increase with time, but I'm seeing that people say their gaps are getting too tight with time.
How is that possible?
I thought that when the parts wear out, the gap should always increase. How can it decrease by wearing out?

BJ

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post #2 of 6 Old Jan 12th, 2011, 6:57 pm
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Re: What happens to the Valve clearance with time?

The valve clearance decreases because the as the valve and valve seat wears the valve seats further into head.
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post #3 of 6 Old Jan 12th, 2011, 8:01 pm
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Re: What happens to the Valve clearance with time?

Quote:
Originally Posted by bjedruszczak
Just curious, what happens to the valve clearance with time and wear.
Does the gap increase or decrease with time.
My logic says that the gap should always increase with time, but I'm seeing that people say their gaps are getting too tight with time.
How is that possible?
I thought that when the parts wear out, the gap should always increase. How can it decrease by wearing out?

BJ
BJ, a coupla paragraphs into this site will explain about valve clearances and checks and adjustments, and the why. HTH.
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post #4 of 6 Old Jan 12th, 2011, 9:21 pm
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Re: What happens to the Valve clearance with time?

Quote:
Originally Posted by bjedruszczak
Just curious, what happens to the valve clearance with time and wear.

What happens with the Valve Clearances with time??? On a BMW, not much. Seriously, the wear and change on my BMW engines has been wonderful compared to other makes. We'll see how the 'Wing does soon...

Jack Homesley
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post #5 of 6 Old Jan 13th, 2011, 6:06 am
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Re: What happens to the Valve clearance with time?

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Originally Posted by cccpastorjack
What happens with the Valve Clearances with time??? On a BMW, not much. Seriously, the wear and change on my BMW engines has been wonderful compared to other makes. We'll see how the 'Wing does soon...
Doesn't the wing have hydraulic lifters? I thought I read some where that the 1800's went to hydraulic lifters, and cam chains Vs belts on the 1500's.

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post #6 of 6 Old Jan 14th, 2011, 6:42 am
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Re: What happens to the Valve clearance with time?

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Originally Posted by bigbear
Doesn't the wing have hydraulic lifters? I thought I read some where that the 1800's went to hydraulic lifters, and cam chains Vs belts on the 1500's.

Roy
The 1800s have chains and shim under bucket valves.

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