getting fed up chasing this engine noise
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Joined: Apr 2017
Posts: 75
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From: Tallahassee, FL
getting fed up chasing this engine noise
hey guys figured id make a new thread on the matter.....
link to old post << Click
so got the heads back from machine shop had the guides replaced, and the valves cleaned and checked to see if there was anything
wrong with the seats or anything else and they checked out with a clean bill of health ...
new head gaskets new rocker box gaskets and she was ready to fire.
started up and just getting all the carbon off the intake valves made a difference she idles better than she ever did starts and runs good and about 5 miles down the road
well the video will let you hear it.... its literally got me confused to no extent....
here's the new parts list of what was done to the bike just to catch up on it and also the engine never made this sound ever....
I only took the motor apart to do base, head, and rocker box gaskets and turned into a nightmare...
new S&S 88ci cylinders and pistons
new rocker shaft and rocker arms shimmed to spec
new S&S lifter and tappets
and now new valve guides the old cast iron ones were replaced with manganese bronze kibble white guides
only thing I can kind of think of trying next is either breather gear is clogged up or maybe lifter blocks
or its literally sell this motor and I might go pan and stay nostalgic or just throw a new evo in it and ride it with no worries and about half the price
sorry for the long read I'm just trying to figure this out and save myself the money and headache already
PS. also the noise is only when the motor is at operation temp and at idle the oil pressure gauge is pretty low could it be oil starvation?
i dont know anymore
link to old post << Click
so got the heads back from machine shop had the guides replaced, and the valves cleaned and checked to see if there was anything
wrong with the seats or anything else and they checked out with a clean bill of health ...
new head gaskets new rocker box gaskets and she was ready to fire.
started up and just getting all the carbon off the intake valves made a difference she idles better than she ever did starts and runs good and about 5 miles down the road
well the video will let you hear it.... its literally got me confused to no extent....
here's the new parts list of what was done to the bike just to catch up on it and also the engine never made this sound ever....
I only took the motor apart to do base, head, and rocker box gaskets and turned into a nightmare...
new S&S 88ci cylinders and pistons
new rocker shaft and rocker arms shimmed to spec
new S&S lifter and tappets
and now new valve guides the old cast iron ones were replaced with manganese bronze kibble white guides
only thing I can kind of think of trying next is either breather gear is clogged up or maybe lifter blocks
or its literally sell this motor and I might go pan and stay nostalgic or just throw a new evo in it and ride it with no worries and about half the price
sorry for the long read I'm just trying to figure this out and save myself the money and headache already
PS. also the noise is only when the motor is at operation temp and at idle the oil pressure gauge is pretty low could it be oil starvation?
i dont know anymore
Last edited by Polodinks; Jul 14, 2019 at 08:05 PM.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,747
Likes: 419
From: Vermont
Sure u dont have fat SS aluminum push rods hiting the push rod tubes? Theyn expand warm.....had one just the other day do it..... took 3 thou off push rods noise gone...so he is getting the bigger tubes
Last edited by Bumpandrun; Jul 14, 2019 at 08:50 PM.
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Posts: 12,878
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From: la la land jerzey
you don't say but its a guess you have solids and a Andrews B cam
now with it running at temp try this - put you hand on the center of the pushrod cover - if you feel anything at all some of the noise is the lifter adjuster hitting the top inner tube > its bottom against the adjuster fir the pushrod
the side to side play on the rocker arm is too great - when its still warm bring each valve up to its spin spot > then push the top of the push rod from left to right - how loose is it - it should be only a taste and you wont hear a clack if you do that is also some of the noise
this will require the lifter blocks to be removed - what your looking for is the cam shaft end play - does the cam move easy back and forth cold - or do you need a screwdriver to walk it back and forth cold - if its loose that is also some of the noise
a clogged breather valve is right up against summer and winter air in the tires < someone is pulling your leg
now with it running at temp try this - put you hand on the center of the pushrod cover - if you feel anything at all some of the noise is the lifter adjuster hitting the top inner tube > its bottom against the adjuster fir the pushrod
the side to side play on the rocker arm is too great - when its still warm bring each valve up to its spin spot > then push the top of the push rod from left to right - how loose is it - it should be only a taste and you wont hear a clack if you do that is also some of the noise
this will require the lifter blocks to be removed - what your looking for is the cam shaft end play - does the cam move easy back and forth cold - or do you need a screwdriver to walk it back and forth cold - if its loose that is also some of the noise
a clogged breather valve is right up against summer and winter air in the tires < someone is pulling your leg
Club Member
Joined: Mar 2009
Posts: 66,110
Likes: 51,396
From: Niles Canyon Ca.
Agree with John sounds like solids with hydraulic ramped cam. On the off chance you checked for oil flow to the front head ? Seen thread tape or a chunk of the rubber grommet block the crossover tube on a couple. Heard a lot of pushrod tube rubbing in various motors but it never sounds that tinny and you can see the tubes flexing at an idle when they do
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Joined: Apr 2017
Posts: 75
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From: Tallahassee, FL
you don't say but its a guess you have solids and a Andrews B cam
now with it running at temp try this - put you hand on the center of the pushrod cover - if you feel anything at all some of the noise is the lifter adjuster hitting the top inner tube > its bottom against the adjuster fir the pushrod
the side to side play on the rocker arm is too great - when its still warm bring each valve up to its spin spot > then push the top of the push rod from left to right - how loose is it - it should be only a taste and you wont hear a clack if you do that is also some of the noise
this will require the lifter blocks to be removed - what your looking for is the cam shaft end play - does the cam move easy back and forth cold - or do you need a screwdriver to walk it back and forth cold - if its loose that is also some of the noise
a clogged breather valve is right up against summer and winter air in the tires < someone is pulling your leg
now with it running at temp try this - put you hand on the center of the pushrod cover - if you feel anything at all some of the noise is the lifter adjuster hitting the top inner tube > its bottom against the adjuster fir the pushrod
the side to side play on the rocker arm is too great - when its still warm bring each valve up to its spin spot > then push the top of the push rod from left to right - how loose is it - it should be only a taste and you wont hear a clack if you do that is also some of the noise
this will require the lifter blocks to be removed - what your looking for is the cam shaft end play - does the cam move easy back and forth cold - or do you need a screwdriver to walk it back and forth cold - if its loose that is also some of the noise
a clogged breather valve is right up against summer and winter air in the tires < someone is pulling your leg
what i cant understand is if it was down in the cam chest wouldnt the noise be down there also? cause everywhere else it sounds like a sewing machine nice and quiet and just on the front rocker box its that clinking
i started it back up just to see if it was still doing it a hour or so after i rode it and it was quiet
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Joined: Apr 2017
Posts: 75
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From: Tallahassee, FL
Agree with John sounds like solids with hydraulic ramped cam. On the off chance you checked for oil flow to the front head ? Seen thread tape or a chunk of the rubber grommet block the crossover tube on a couple. Heard a lot of pushrod tube rubbing in various motors but it never sounds that tinny and you can see the tubes flexing at an idle when they do
its hydraulic lifters in it replaced them with the same that was in it just new ones yeah check oil flow it was still good to front head
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Club Member
Joined: Mar 2009
Posts: 66,110
Likes: 51,396
From: Niles Canyon Ca.
Another couple dumb questions, oil supply to the lifter blocks good ? Lifter oriented so they feed correctly? Are they pumping up properly ? Had new that wouldn't pump up before. Replaced the whole lifter or just the inserts?
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Thread Starter
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Joined: Apr 2017
Posts: 75
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From: Tallahassee, FL
i pulled the pushrod tube and started it and oh boy is it getting oil started spewing towards me when i lifted the bottom of the tube and i replaced the whole lifter and insert i even swapped the front ones to the rear to see if they would make noise in the rear instead of the front and didnt change a thing