Valve CHECK lobe position? - BMW Luxury Touring Community
 
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post #1 of 8 Old Oct 29th, 2008, 2:27 pm Thread Starter
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Valve CHECK lobe position?

Ok I am starting to get confused. I have the Gunsmoke and Sayegh video and done research. I am confused on the position of the lobes when checking the clearance. On Gunsmoke it says that the lobe should be pointing straight out and draw an imaginary line from tip of lobe thru cam to center of bucket. But when the lobe is straight out there is not a straight line to center of bucket. I have to go a little further to get a straight line from lobe tip to bucket center. But when I watch video it looks like the lobe IS straight out at same line as the place where a place that a screw would go into. Should I line the lobe up with the screw hole or what? Help please!!!
Thanks

Marc Pillis- MSF Rider Coach
Union, Kentucky
2005 LT
2004 R1150GS Adventure
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post #2 of 8 Old Oct 29th, 2008, 2:45 pm
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Re: Valve CHECK lobe position?

Your Cam Lobe has an area of which 50% is round, so the lobe point can be off center by about 20% without a problem. As long as the round part is in the back your good.

John & Cathy
Northern CA
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post #3 of 8 Old Oct 29th, 2008, 3:02 pm
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Re: Valve CHECK lobe position?

I line up the lobe with the center of the buckets, which makes it off center from horizontal. For the intake valves, the lobe was just above horizontal and for the exhaust valves, just below horizontal. You can see in the attached thumbnails, valve 4 intake and valve 2 exhaust are both ready to measure. Then you rotate the rear wheel (bike in 5th gear) to align the next set of valves.
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Dan Sullivan
2011 vStrom DL650
1999 K1200LTC
Hillsborough, NJ
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post #4 of 8 Old Oct 29th, 2008, 3:07 pm
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Re: Valve CHECK lobe position?

Here is the explanation for the thumbnails in my previous post:
Thumbnail 1 - valve cover removed
2 - valve 4 intake ready to measure
3 - valve 4 intake being measured 0.015 mm
4 - valve 2 exhaust closeup
5 - valve 2 exhaust ready to measure
6 - valve 2 exhaust being measured 0.025mm

Dan Sullivan
2011 vStrom DL650
1999 K1200LTC
Hillsborough, NJ
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post #5 of 8 Old Oct 29th, 2008, 3:46 pm
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Re: Valve CHECK lobe position?

FWIW I'm not sure who first created it, but this sheet was handy for me to record the clearances:

Valve Clearance Check Sheet

Joe

2005 KLT "Old Blue"

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post #6 of 8 Old Oct 29th, 2008, 3:56 pm Thread Starter
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Re: Valve CHECK lobe position?

Thanks to everyone. I think I did it right by be a little off of straight out. Now I have to figure out if I actually have the drill bit seated in the chain tensioner. It goes in an inch but it is loose in there and does not seem like it is engaging anything. I can just push and pull it in and out easily. Does that mean I am not "in the groove"?

Marc Pillis- MSF Rider Coach
Union, Kentucky
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2004 R1150GS Adventure
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post #7 of 8 Old Oct 29th, 2008, 8:36 pm
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Re: Valve CHECK lobe position?

Quote:
Originally Posted by mpillis
Thanks to everyone. I think I did it right by be a little off of straight out. Now I have to figure out if I actually have the drill bit seated in the chain tensioner. It goes in an inch but it is loose in there and does not seem like it is engaging anything. I can just push and pull it in and out easily. Does that mean I am not "in the groove"?
It is not in place.

It will go in over 1-1/2". At first it will be loose, but let it sit for a couple of minutes so that the spring in the cylinder pushes the tensioner back out until the pin stops it. Then it will be fairly tight.

Here is a picture of the tensioner tool I made. You can see that it is 1-5/8" of straight pin below the "handle". It was pushed in until the handle bottomed out on the timing cover.

You can have the cam lobes pointed considerably (+/- 30 degrees)to either side of perpendicular to the follower face and still be fine.
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post #8 of 8 Old Oct 30th, 2008, 4:11 am Thread Starter
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Re: Valve CHECK lobe position?

Thanks I didn't think it was in enough. I will work on it some more this evening.

Marc Pillis- MSF Rider Coach
Union, Kentucky
2005 LT
2004 R1150GS Adventure
2013 DR650
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