Cam shim stock or? - BMW Luxury Touring Community
 
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post #1 of 7 Old Mar 21st, 2006, 11:13 pm Thread Starter
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Cam shim stock or?

While adjusting the valve clearance I spotted what at first appeared to be a piece of gasket material stuck to the surface where the second intake bearing cap seats (bottom side). On closer inspection it is a piece of plastic like material that appears to have been placed there as a shim or perhaps some form of plastigauge that was left behind. It's fairly thick (haven't measured it yet) and stiff and only present on one side of the cap. Not sure whether it should stay or be removed.
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post #2 of 7 Old Mar 22nd, 2006, 8:21 am
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Picture would help, should be no plastic on any part of the valve bucket that I know of.

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post #3 of 7 Old Mar 22nd, 2006, 9:29 am Thread Starter
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I will get a photo if I don't figure it out shortly. It isn't near the bucket, it's under the lower portion of one of the bearing caps between the cap and the head.. It's about 3/16 x 1/2 with a small tab on each end. I've never come across anything like it on other LT's. Seems a little thick for a clearance shim but in it's current position that's the effect it's having.
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post #4 of 7 Old Mar 22nd, 2006, 10:49 am
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Quote:
Originally Posted by mjordans2000
I will get a photo if I don't figure it out shortly. It isn't near the bucket, it's under the lower portion of one of the bearing caps between the cap and the head.. It's about 3/16 x 1/2 with a small tab on each end. I've never come across anything like it on other LT's. Seems a little thick for a clearance shim but in it's current position that's the effect it's having.
Wow! Sounds like a factory goof, and shimmed. I would not have expected BMW to do that! I use plastic shim stock often, it is available in packs of color coded thicknesses.

I have done valve work on several K engines, never saw any shimmed cam bearing caps.

To be safe, get some plastigage from your local auto parts company and check the bearing clearance on that cap. It is REALLY strange that it is only on ONE side of the cap!

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post #5 of 7 Old Mar 22nd, 2006, 10:48 pm Thread Starter
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I agree, one side only is odd. I do plan to check the gap, seems the only logical way to figure out if this a mistake or if it needs to be there.
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post #6 of 7 Old Mar 22nd, 2006, 11:23 pm
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Is this the same cam that had the gear put on improperly?
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post #7 of 7 Old Mar 23rd, 2006, 9:00 am Thread Starter
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As a matter of fact it is. I don't know if that's related to this issue but I intend to ask the dealer who did that work if they have any idea what's going on. By the way, they did step up and give me a replacement sprocket even though it's been almost two years since the bike last needed a valve adjustment. For those not present at the March 12th service party when I removed the intake cam it was discovered when the cam was last removed. the sprocket moved while being bolted back on. The locating pin was destroyed as it was forced back into the key slot in the cam. The pin is relatively short so this could easily happen to anybody. I've taken to wiggling the sprocket prior to the last turns of the wrench to make sure the sprocket is still properly lined up.
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