valves not turning
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Outstanding HDF Member
Joined: Oct 2009
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From: Maryland near DC
valves not turning
I had the valve covers off of my flhrc 103 with 8000 miles on it and found that 2 of the valves (I don't remember which ones) didn't appear to be turning ...at least from looking at the wear on the end of the valves where they rub the rocker...at the time I didn't give it any mind..but now I have thought about it..is it anything I should be worried about???
Road Captain
Joined: Oct 2010
Posts: 683
Likes: 3
From: Florida
Oh so that's what he's talking about. I was wondering if bikes did that too. For that matter I didn't even really know is all the cars still did that. But I remember reading about it as a teenager. If memory serves (and at my age it don't always) the lobe is shaped to cause a slight spin of the lifter each lift, correct ?
Ultimate HDF Member
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From: SoCal
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Cruiser
Joined: Sep 2011
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From: Minnesota
The one problem I have seen (in cars) with valves not turning is the accumulation of carbon deposits, leading to the valve hanging open, leading to low compression, leading to poor driveability. My understanding is that (again, in cars) the valves will start to turn around 3000 RPM. And, the turning valves keep the sealing surface clean. This problem is mainly found in cars owned by old people that never rev up the engine.
This might be totally useless info for this case, but I thought I would share...
This might be totally useless info for this case, but I thought I would share...
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Road Captain
Joined: Oct 2010
Posts: 683
Likes: 3
From: Florida
LOL that is so true, but they would if it they were not connected in pairs LOL.
(which would be disastrious by the way)
I looked it up, and my memory was right. The lobes on most auto cams (not sure bout HD) are tapered to cause a slight rotation of the lifter (and valve train to some extent).
It even gave some pics on how to examine the patterns on your cam lobes to see if the taper (and the lifters) had worn out and no longer provided this turning.
If the OP doesn't have that many miles on his cam there is probably nothing to worry about, but it would be interesting to track down if HD does in fact design this rotation into their cams also.
(which would be disastrious by the way)
I looked it up, and my memory was right. The lobes on most auto cams (not sure bout HD) are tapered to cause a slight rotation of the lifter (and valve train to some extent).
It even gave some pics on how to examine the patterns on your cam lobes to see if the taper (and the lifters) had worn out and no longer provided this turning.
If the OP doesn't have that many miles on his cam there is probably nothing to worry about, but it would be interesting to track down if HD does in fact design this rotation into their cams also.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
LOL that is so true, but they would if it they were not connected in pairs LOL.
(which would be disastrious by the way)
I looked it up, and my memory was right. The lobes on most auto cams (not sure bout HD) are tapered to cause a slight rotation of the lifter (and valve train to some extent).
It even gave some pics on how to examine the patterns on your cam lobes to see if the taper (and the lifters) had worn out and no longer provided this turning.
If the OP doesn't have that many miles on his cam there is probably nothing to worry about, but it would be interesting to track down if HD does in fact design this rotation into their cams also.
(which would be disastrious by the way)
I looked it up, and my memory was right. The lobes on most auto cams (not sure bout HD) are tapered to cause a slight rotation of the lifter (and valve train to some extent).
It even gave some pics on how to examine the patterns on your cam lobes to see if the taper (and the lifters) had worn out and no longer provided this turning.
If the OP doesn't have that many miles on his cam there is probably nothing to worry about, but it would be interesting to track down if HD does in fact design this rotation into their cams also.