valve inspection - BMW Luxury Touring Community
 
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post #1 of 9 Old Oct 19th, 2008, 8:54 pm Thread Starter
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valve inspection

Where is a good place to get instructions for checking valve clearances, adjustments and throttle body adjustments.

I read once that someone had an instructional dvd for sale.

I am semi mechanically inclined, but "for dummies" directions would be good for me.
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post #2 of 9 Old Oct 19th, 2008, 9:30 pm
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Re: valve inspection

www.gunsmoke.com , go to K1200RS page, valve adjustment (valve adjustment same as for LT engine). Only change: do NOT remove sparking plugs before checking valve gap.

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post #3 of 9 Old Oct 20th, 2008, 9:22 am
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Re: valve inspection

Quote:
Originally Posted by bob_menton
www.gunsmoke.com , go to K1200RS page, valve adjustment (valve adjustment same as for LT engine). Only change: do NOT remove sparking plugs before checking valve gap.

- Bob
Newbie question - why not remove the spark plugs, and why does gunsmoke recommend that they should be removed?

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post #4 of 9 Old Oct 20th, 2008, 10:55 am
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Re: valve inspection

Quote:
Originally Posted by razman10
Newbie question - why not remove the spark plugs, and why does gunsmoke recommend that they should be removed?
That is one thing that the Gunsmoke had very, very wrong. Ufortunately, I have not been able to find a way to contact the author and have him change it.

It is specifically stated in the BMW service manuals that the spark plugs should NEVER be removed before checking valve clearances.

The reason is that removing spark plugs usually dislodges small flecks of carbon, which could fall down into any open exhaust valves on the LT engine. Then when checking the clearances the valves could close on this material causing the clearance reading to read higher than is real. This could cause one to think that the clearance is good, or too large, and as soon as the engine is started the debris would be blown out and the clearance would be smaller by the thickness of the debris. Remember, the clearance tolerance is less than the thickness of a piece of paper, so something that thick or more between the valve and seat could cause a very wrong reading.

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post #5 of 9 Old Oct 20th, 2008, 12:58 pm
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Re: valve inspection

I see (said the blind man, as he picked up his hammer and saw...) It makes sense.

So then there is no purpose whatsoever for removing the plugs for a valve check. Do they need to be removed if an adjustment is needed?

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post #6 of 9 Old Oct 20th, 2008, 1:07 pm
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Re: valve inspection

Paul Sayegh's maintence video's do go through checking valve clearances. It also stresses not to remove the spark plugs. His video does not go through the actual adjustment procedure, should that be necessary.
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post #7 of 9 Old Oct 20th, 2008, 3:10 pm
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Re: valve inspection

Quote:
Originally Posted by razman10
I see (said the blind man, as he picked up his hammer and saw...) It makes sense.

So then there is no purpose whatsoever for removing the plugs for a valve check. Do they need to be removed if an adjustment is needed?
No need to remove the plugs for any reason except to change them. If not changing the plugs, then leave 'em in. We don't gap or clean them, just change them periodically.

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David Shealey
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post #8 of 9 Old Oct 20th, 2008, 9:08 pm
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Re: valve inspection

Quote:
Originally Posted by razman10
So then there is no purpose whatsoever for removing the plugs for a valve check. Do they need to be removed if an adjustment is needed?
I believe his thinking was the engine would be easily rotated without the compression. Thus making the job of placing the cams in position over the valve buckets, for measuring, much easier. David is 100% correct that flakes of carbon can be dislodged from the plugs and fall between an open seat and the exhaust valve surface whice can make for a false measument.

I replace the plugs every 50k, therefore in 5k miles I'll be installing my 3rd set.

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post #9 of 9 Old Oct 21st, 2008, 9:06 am
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Re: valve inspection

David & Ernie,

Thanks for your insight!

(I love this place! )

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