Adjusted valve's but engine is still tapping
Thread Starter
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Tourer
Joined: Mar 2006
Posts: 449
Likes: 1
From: Ventura, CA (So Cal)
Adjusted valve's but engine is still tapping
06' twin cam 88 inside of motor is stock. Just installed the screaming eagle adjustable push rod kit (freaking $175) and everything went smooth and the valve train is definately a little quieter. But the " sewing machine" sound that exists at 2400-3000 rpm is still there. Most pronouned when cruising at that rpm in the lower gears. I have 25k on the bike and it's last oil change was around 2k ago with Rev tec 20 50 synthetic. What else could it be? Anyone adjust thier valves and still have this problem?
Elite HDF Member
Joined: Apr 2007
Posts: 4,919
Likes: 23
From: Seattle, WA
I wondered what you were referring to when you said you 'adjusted' the valves ... with solid rockers and hydraulic lifters there's nothing to really 'adjust' ...
But ... if you think about it, if you adjust the pushrods to lengthen them, all you'll really do is remove some of the expansion capability of the lifters ... if you shorten the push rods, oil pressure the lifters will remove the 'slack' from the system ... this is all within limits, of course ....
I have noticed that when my oil level is below about a third of the way from the lower limit to the capacity level on the filler stick I notice a little more noise ... adding to above the half-way line quiets it down pretty well ...
Some of the more aggressive cam profiles will cause a little more valvetrain noise ... but, like it or not, there is a residual amount of sewing machine noise that will remain ....
Maybe some others will chime in with some differing experience or opinions ...??
Good luck driving the noise to a minimum ...
R/
'Chop
But ... if you think about it, if you adjust the pushrods to lengthen them, all you'll really do is remove some of the expansion capability of the lifters ... if you shorten the push rods, oil pressure the lifters will remove the 'slack' from the system ... this is all within limits, of course ....
I have noticed that when my oil level is below about a third of the way from the lower limit to the capacity level on the filler stick I notice a little more noise ... adding to above the half-way line quiets it down pretty well ...
Some of the more aggressive cam profiles will cause a little more valvetrain noise ... but, like it or not, there is a residual amount of sewing machine noise that will remain ....
Maybe some others will chime in with some differing experience or opinions ...??
Good luck driving the noise to a minimum ...
R/
'Chop
Thread Starter
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Tourer
Joined: Mar 2006
Posts: 449
Likes: 1
From: Ventura, CA (So Cal)
The oil level is at the full mark. All the older center cam overhead valve engines like the chevy 350 is hydrolic lifter but need to be adjusted every so often. I sounds like a loose valve but it's obvious not since i know it's adjusted right. I did the 2.5 turns and its a stock cam. I check my exaust flange nuts every 1,000 miles. Could it be a blown exaust gasket? Would that only make noise at certain rpm? The only other thing i think it could be is a loose rocker or something. It's defenately top end and seems to be coming from the rear cylinder. Also is there a chance it might just be pinging? It only does it at light throttle at 2500-3000 rpm. If i get on it it goes away. The spark plugs look perfect and the bike runs great and has a custom map with a sert that was done at 1,000 miles and i always run the same brand of 91 octane fuel
I am curious as to why you fitted adjustable push rods.
The only reasons I can think that require adjustable pushrods are
1, New Cam High lift and or ground on a different base line.
2, Longer cylinder bores and or modified heads rendering standard pushrods to long or to short.
3, The ability of changing cam / cams without removing top end.
Unless someone tells me differently there is no other reason.
The only reasons I can think that require adjustable pushrods are
1, New Cam High lift and or ground on a different base line.
2, Longer cylinder bores and or modified heads rendering standard pushrods to long or to short.
3, The ability of changing cam / cams without removing top end.
Unless someone tells me differently there is no other reason.
Road Master
Joined: Aug 2006
Posts: 837
Likes: 1
From: Radcliff, Ky
The oil level is at the full mark. All the older center cam overhead valve engines like the chevy 350 is hydrolic lifter but need to be adjusted every so often. I sounds like a loose valve but it's obvious not since i know it's adjusted right. I did the 2.5 turns and its a stock cam. I check my exaust flange nuts every 1,000 miles. Could it be a blown exaust gasket? Would that only make noise at certain rpm? The only other thing i think it could be is a loose rocker or something. It's defenately top end and seems to be coming from the rear cylinder. Also is there a chance it might just be pinging? It only does it at light throttle at 2500-3000 rpm. If i get on it it goes away. The spark plugs look perfect and the bike runs great and has a custom map with a sert that was done at 1,000 miles and i always run the same brand of 91 octane fuel
I am curious as to why you fitted adjustable push rods.
The only reasons I can think that require adjustable pushrods are
1, New Cam High lift and or ground on a different base line.
2, Longer cylinder bores and or modified heads rendering standard pushrods to long or to short.
3, The ability of changing cam / cams without removing top end.
Unless someone tells me differently there is no other reason.
The only reasons I can think that require adjustable pushrods are
1, New Cam High lift and or ground on a different base line.
2, Longer cylinder bores and or modified heads rendering standard pushrods to long or to short.
3, The ability of changing cam / cams without removing top end.
Unless someone tells me differently there is no other reason.
Trending Topics
Surly if you have worn rockers repair/replace worn rockers.
Fitting adjustable pushrods is no repair and a waste of money because the worn items are still worn.
Think someone gave bad advice.
Fitting adjustable pushrods is no repair and a waste of money because the worn items are still worn.
Think someone gave bad advice.
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Thread Starter
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Tourer
Joined: Mar 2006
Posts: 449
Likes: 1
From: Ventura, CA (So Cal)
The reason i put in the adjustable push rods was advice on this forum from several threads. Also an independent shop that is very reputable said it's very common to need valve adjustment around 25-30. The cam chest and lifters are fine. The noise is coming from the top end it sounds like a pinging or sewing machine sound. It doesn't sound normal. It sounds like an old honda civic with 300,000 miles on it that needs a valve adjustment.