temporary engine noise
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Road Captain
Joined: Jan 2010
Posts: 657
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From: Lakeshore Wis.
temporary engine noise
this just started at the end of summer this year. It almost has to be 1 of 2 things. IF YOU have had this happen, DO tell!
If the bike sat for 2 or more days, upon COLD start-up, the motor is fairly noisy. (top end) Like the lifters may have bled down. But after 20 to 30 seconds, it's nice and quiet. So lifter bleed down is 1 of my thoughts. Although that seems a bit unlikely. My 2nd guess is maybe the chain tensioners are bleeding down. But I dont think that would create that sound. So what are your thoughts ?
2015 Streetglide, stock original engine, 33,000 miles. always good oil and changed less than 5000 miles EVERYTIME.
If the bike sat for 2 or more days, upon COLD start-up, the motor is fairly noisy. (top end) Like the lifters may have bled down. But after 20 to 30 seconds, it's nice and quiet. So lifter bleed down is 1 of my thoughts. Although that seems a bit unlikely. My 2nd guess is maybe the chain tensioners are bleeding down. But I dont think that would create that sound. So what are your thoughts ?
2015 Streetglide, stock original engine, 33,000 miles. always good oil and changed less than 5000 miles EVERYTIME.
Last edited by sbeamer; Dec 8, 2019 at 08:29 PM. Reason: added content
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
Those are the "C" lifters, not made in the US by Delphi; I think made in Mexico. Some bleed down after 25K miles would not surprise me as the tolerances are not that tight; replace them with better hardware. S&S Premiiums or look at choices from WFO Larry.
http://www.larrysmotorcyclemachine.com/lifters.html
http://www.larrysmotorcyclemachine.com/lifters.html
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,309
Likes: 6,328
From: Honah Lee
Why be concerned if it sounds OK after a few seconds. The valve springs override lifter pressure. It's refered to as bleed down rate. The lifter when running maintains zero lash at the base circle of the cam. If it didn't work like that, it would hold valve off seat and burn valves.
If engine stops with valve open, and engine sits, it will tap a little at start up especial if it does not crank a second or two with starter which usually pumps lifter before it's up to high idle.
Some sound also on cools days at that milage may be a little piston slap till it catches up with cylinder.
Again, if it sounds OK as high idle drops off, check back at 100K and report back.
If engine stops with valve open, and engine sits, it will tap a little at start up especial if it does not crank a second or two with starter which usually pumps lifter before it's up to high idle.
Some sound also on cools days at that milage may be a little piston slap till it catches up with cylinder.
Again, if it sounds OK as high idle drops off, check back at 100K and report back.
Last edited by Jackie Paper; Dec 9, 2019 at 07:13 PM.
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HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
Anyway, the "B" lifter was a made in the USA by Delphi product and was a robust piece of hardware but, the HD bean counters decided they could save a few cents if the outsourced the lifter to Mexico and, as you might imagine, quality suffered. So, if the OP would never buy HD, mistake BTW as many of the HD parts are as good as any aftermarket alternative, options for lifter replacement are suggested in my previous post.I would disagree with Ripsaw even though he makes a valid point that if the clatter goes away as the motor warms up, why bother with replacement lifters. My problem with that is that there have been roller and other failures with the "C" lifter which is why I think replacement is a good idea. My all bore 107" motor runs forged pistons that are set up on the "loose" side of piston to wall clearance and it, along with Woods Directional lifters, rattle a lot on cold starts but when up to operating temps, quiet as it can be. I doubt that the OP is hearing piston slap at 30k miles with regular oil/filter changes.
Bottom line, replacing the lifters with a quality piece of hardware, IMHO, would be a worthwhile upgrade.
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