cam follower clearance question - BMW Luxury Touring Community
 
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post #1 of 6 Old Nov 28th, 2014, 6:06 pm Thread Starter
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cam follower clearance question

All ready to replace one of the buckets and have a quick question.

Cylinder 4, intake 2 ( rearmost valve ) is 0.005mm out of spec on the high side at 0.0145mm.
Leave it or change it?

All others are easily in spec.
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post #2 of 6 Old Nov 28th, 2014, 6:31 pm
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Re: cam follower clearance question

While an intake is less likely to burn when tight I would still change it as it is out of spec. And I think you mean 0.145 mm not 0.0145 It would be .006 in inches. If it is a a loose 0.15 I would leave it but if 0.15 will not go easily it is time to change it. It will only get tighter with age.

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post #3 of 6 Old Nov 28th, 2014, 7:39 pm
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Re: cam follower clearance question

Quote:
Originally Posted by Hoodcounty View Post
All ready to replace one of the buckets and have a quick question.

Cylinder 4, intake 2 ( rearmost valve ) is 0.005mm out of spec on the high side at 0.0145mm.
Leave it or change it?

All others are easily in spec.
The master (Jzeiler) has spoken and I agree. An INTAKE clearance a bit below 0.15 mm should be changed for a next thinner (smaller) bucket. If there was only one Intake at exactly 0.15 mm altogether (all other intake and exhaust are OK), then I would be lazy and maybe wait for next major inspection.

ALSO... make sure engine is dead cold (8 hours of more) when doing measurements -AND- always do 2 tests of complete engine FORWARD rotation to confirm error in 1st reading before you start to think about changing / swapping buckets.

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post #4 of 6 Old Nov 28th, 2014, 9:01 pm
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Re: cam follower clearance question

I would not bother to change a slightly larger than spec. clearance, but would certainly change a slightly tight one. Larger will eventually get tighter, already tight risks burning a valve.

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post #5 of 6 Old Nov 28th, 2014, 10:58 pm Thread Starter
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Re: cam follower clearance question

I am of the same opinion. Looking at it as in intake valve I'm less concerned but already have the thing apart and ready to remove the cams so out it comes.
I planned on having the bike down for a few weeks since I dumped it ( padded the fall when I hit the road under the bike ) while on vacation last Saturday.
Back is still in less than stellar shape so there's plenty of time to do things correctly.
Besides, I've never done a bucket swap before and get to learn a new skill.
Already sorted out plastic welding
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post #6 of 6 Old Nov 29th, 2014, 11:34 am Thread Starter
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Re: cam bucket trade??

Ok, got everything apart and should really replace 5 cam buckets.
looks like I have a pair of 2.800 to trade and will need
1 each 2.75
2 each 2.7
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