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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 1 Week Ago
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I do not understand why everyone on this forum does not have a stethoscope. They are inexpensive here at Princess Auto. Should be the same at Harbor Freight. Or anywhere.
?
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  #12  
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andy2175m4 andy2175m4 is offline
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Hi Guys

I have gone over the running engine 10 times, listening with a stethoscope, a heater hose, and every other thing I can think of, and the sound seems to be almost everywhere in the rear cylinder, the head, the jug, the rocker box, I can't quite pin it down to a single spot, like a rocker arm, or a piston skirt, or a lifter, I know its not the exhaust pipe, I've had 3 different sets of pipes in 2 years and sound does not change.

but when I tear it down, all the way to the con rods, I don't find any parts that are cracked or otherwise damaged, if I heard this noise in a Ford 302 or a Chevy 350 I'd be planning to buy a set of new hydraulic lifters, because one of them was not pumping up, but these non-hyd ironhead lifters are fine, like new, I cannot find anything wrong with the push-rods, rockers, lifters, nothing looks amiss. the pistons are .0045 clearance, in spec, so I am at a loss.

Any more ideas ?
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  #13  
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andy2175m4 andy2175m4 is offline
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Quote:
Originally Posted by IronMick View Post
I do not understand why everyone on this forum does not have a stethoscope. They are inexpensive here at Princess Auto. Should be the same at Harbor Freight. Or anywhere.
?
i have used a stethescope time after time to find this noise and cannot pinpoint it to one part that is damaged,
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  #14  
Old 1 Week Ago
andy2175m4 andy2175m4 is offline
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I think I found something, I tore down the rear cylinder rocker box, again, and this time I looked very closely at the two rocker arms and the two rocker shafts, and of the 2 rocker arms one of them seems to have some clearance between the bushing and the shaft, that is, it moves just a bit, on the order of a (guessing) 2-3 mils, but that may be enough to cause that ringing sound, the other rocker arm has Zero clearance, and all my other motorcycles I have worked on (there are many) in a good running engine there is NO clearance or movement between a rocker and its pivot, so that must be it. it's not much movement but it's def. greater than zero and that's the place where the noise comes from, the rear top end.........new bushings may fix it !
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  #15  
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Hi Andy, when you say 2-3 mils, do you mean like nearly 1/8” inch?
......Davi.
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Well, that's strange.

I woul expect to hear a rhythmic tap at a much lower frequency if it was a rocker bushing.
For a complete engine revolution there is no force applied to the rocker shaft by the camshaft, only spring pressure.
I could understand a tap when the cam lobe first started to move the push rod and then another as the spring closed the valve after the cam lobe had finished the open portion of it's cycle. But the noise I heard sound like it was happening much more often - almost continuous.
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  #17  
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worked on a evo sporty this summer that sounded like that, failing lifter roller was the culprit on that one, luckily caught it before the lifter ejected the burnt flattened rollers into the bottom end.
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I just now checked the side play of the 4 rockers to their shafts:

front cylinder exhaust rocker arm sideplay = .002"
front cylinder intake rocker arm sideplay = .000"
rear cylinder intake rocker arm sideplay = .000"
rear cylinder exhaust rocker arm sideplay = .0025 - .003"

the rear cylinder seems to be the one making noise,

Can you suggest a shop where I can send the exhaust rockers to get them rebuilt ? Or where I can purchase rockers with fitted, matching rocker shafts ? if the tolerances are so tight I think they should be matched to the shafts for .000" clearance.

thanks

Andrew
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  #19  
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andy2175m4 andy2175m4 is offline
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I did check that, the roller lifters look fine, roll fine, no surface wear anywhere
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  #20  
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andy2175m4 andy2175m4 is offline
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Quote:
Originally Posted by davixlrtt View Post
Hi Andy, when you say 2-3 mils, do you mean like nearly 1/8” inch?
......Davi.
I mean .002" - .003"
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