Lifters test.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,605
From: san antonio
Yes and Yes; replace the suspected lifter(s). If the noise goes away, you know the lifter has gone bad. If the noise still presents, you know its not the lifter(s).
Last edited by djl; May 17, 2024 at 06:19 PM.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,434
Likes: 6,369
From: Honah Lee
A 2 ear mechanic's stethoscope. It's probably not a lifter.
How many miles. How is it treated? What oil is in it and filter on it.
Stock cams and pushrods? Lot of performance cams don't have a degree or so of about a few thousands of an inch rise before valve lift like on stock cams.
Stock cams takes care of the slight leak down a lifter does when it opens and closes the valve and then around to lift again. There quite.
All lifter leak down some from spring pressure. If they didn't, and could actually over ride the spring, the apx .100 left in the .200 total travel would float a valve and let it burn.
Hopefully, if you are talking a roller bearing is bad, a stethoscope can detect that.
If you hear a rough click with stethoscope, you probably need to go internal.
How many miles. How is it treated? What oil is in it and filter on it.
Stock cams and pushrods? Lot of performance cams don't have a degree or so of about a few thousands of an inch rise before valve lift like on stock cams.
Stock cams takes care of the slight leak down a lifter does when it opens and closes the valve and then around to lift again. There quite.
All lifter leak down some from spring pressure. If they didn't, and could actually over ride the spring, the apx .100 left in the .200 total travel would float a valve and let it burn.
Hopefully, if you are talking a roller bearing is bad, a stethoscope can detect that.
If you hear a rough click with stethoscope, you probably need to go internal.
Last edited by Jackie Paper; May 16, 2024 at 02:51 PM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,863
Likes: 7,982
From: poway
Use a mechanics stethoscope and if the noise does not come from the heads/rocker area, pushrods or cam chest. it's definitely not the lifters.
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Road Master
Joined: Oct 2009
Posts: 1,132
Likes: 36
From: Las Vegas
2021 Road Glide. Stage II 19 months ago. Torque cam. Dyno tuned at dealer over a year ago. Installed SE oil pump and cam. All seemed to run well until last week, when I heard slapping noise. Next day, started bike and slapping still there, sounded from front upper area.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,605
From: san antonio
"Slapping" sound ominous as compared to "ticking". Mileage not mentiioned; maybe time for a compression test?
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Road Master
Joined: Oct 2009
Posts: 1,132
Likes: 36
From: Las Vegas
Maybe not slapping but a little louder than a tick and a bit lower in tone, if that makes sense.
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