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Old 06-14-2014, 08:51 PM   #1
the toe cutter OP
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Question LC4 - elefant feet freeplay? "valve adjusting screw"

Bike is 2000 640 enduro, 20k miles and I'm trying to find out why my valve lash suddenly jumped to around .014" (vs acceptable limit of .006") on every valve in matter of 3k miles. Just pressed out rocker arm bearings and they look fine. Axial play on rocker arm shafts around .30mm.

I've spent the last few hours searching for what is "acceptable" freeplay on the valve adjusting screw on my LC4 without any luck. People sometimes refer to this part as the "elefant foot".

So everyone knows what I'm referring too, see #12 in diagram below "adjusting screw"



The service manual "check" for this part gives no mention of "freeplay"

Here is a video I made to shed some light, one doesn't seem to bad but the other seems like a lot of movement.
https://www.youtube.com/watch?v=RF-q...eature=mh_lolz

Anyone know if this is normal? Should I replace all four (they are about $20 each )? I'm trying to get bike ready for trip in 2 weeks and dealer doesn't have the adjusting screws in stock.

I really don't want to take apart the rocker arm cover again.

Thanks!!


the toe cutter screwed with this post 06-15-2014 at 10:12 AM
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Old 06-15-2014, 03:25 AM   #2
Alik
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The elefant feet on mine LC4 have the same amount of play. Don't worry about them. Check the other components for wear.
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Old 06-15-2014, 09:36 AM   #3
gunnerbuck
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Quote:
Originally Posted by the toe cutter View Post
Bike is 2000 640 enduro, 20k miles and I'm trying to find out why my valve lash suddenly jumped to around .014" (vs acceptable limit of .006") on every valve in matter of 3k miles.

Have a look at your feeler guage, are you reading in mm? If so valve lash is to be set to .015mm... If your guage reads in standard then go to .006"
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Old 06-15-2014, 10:12 AM   #4
the toe cutter OP
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Quote:
Originally Posted by gunnerbuck View Post
Have a look at your feeler guage, are you reading in mm? If so valve lash is to be set to .015mm... If your guage reads in standard then go to .006"
Hi Gunner, not reading mm, I'm reading in inches and valves were all that loose . So about double the accetpable lash of .006".

Most of those 3,000 miles were freeway at 5,200 rpms however I'm not sure that would put the valves that far out of wack. Last time I checked them they, exhaust was a little tight and intake was okay.
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Old 06-15-2014, 11:21 AM   #5
Dustodust
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I have never heard of valves getting looser as they wear. They get tighter as the valve wears into the seat.
The only thing that would make it get looser is valve train damage, like cam deterioration or if the roller bearing is going out

another possibility is if they were adjusted incorrectly last time, as if on the wrong stroke TDC would do just that

About the only issue I am aware of with the swivel adjusters is that when the valve gets so worn it can get tight enough to run the swivel out of room with rocker and it will pop off in the motor and cause chaos
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Old 06-15-2014, 11:31 AM   #6
Dustodust
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saw the vid
IMO that slop if just fine
just adjust and go

be sure you are at TDC compression stroke
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Old 06-16-2014, 08:23 AM   #7
bmwktmbill
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If you set the valves correctly and now have additional lash I'd look hard at the cam followers.

If they haven't been replaced, I'd replace them immediately at your mileage.

Mine have gone out at 12-15K miles.

b
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Old 06-16-2014, 08:24 AM   #8
Boon Booni
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I would say that since all the valves changed spec, it's more likely the follower bearing than the adjuster foot.

Since you've already pressed the roller bearings out, I'd go ahead an replace them.
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