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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #1  
Old 20th February 2020
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jacsul jacsul is offline
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Default top end noise

When you start an engine after a complete (top/bottom) rebuild, how long should it take before the tappets quiet down?
I don't want to ruin a rebuild.
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  #2  
Old 20th February 2020
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Default

Next time, just fill the push rod's tubes.
That way they quiet faster.

After the forth heat cycle, should quiet down.
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  #3  
Old 20th February 2020
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There are holes in the lifter bores beside the lifters that run down to the cam chest and won't let you fill the tubes on a 97 model.
You'll just flood the cam chest then may blow oil out the breathers.

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  #4  
Old 21st February 2020
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Default

Any suggestions
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  #5  
Old 21st February 2020
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i took about 5 miles of riding for the lifters to quit down.
now i am not talking wot either
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Old 21st February 2020
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Default

Suggestions, yes, fire it up and let the lifters pump up as they do with all off our engines.
They will sound like they are about to come out until they fill up.
But that is what we all go thru.
The process of building the top end will deplete the lifters of some of their oil, this is normal.

The bigger question is...
Are you confident with the build?
Did you prelube the lifters by pumping them up by hand or allowing them to soak in oil overnight?
Or did you install them dry?
Did you prelube the rings, oil pump,rockers. all bearings applicable, etc.?
Torque sequence go OK? etc>...
If you lubed everything and are confident of the build...
The lifters are capable of running for a short period while awaiting full oil pressure (assumed prelubed).
When you fire up a cold engine, the oil is thick and doesn't flow as quick.
So by the time the oil thins enough to run freely, it should fill the lifters faster and quiet them down.

This usually only takes a few minutes even though it seems like forever when you're in the middle of it.
But like bustert mentioned, don't roll the throttle heavy until they quiet down.

If the noise persists longer than that--
Shut the engine down, give it a minute and fire it back up. Sometimes the oil drainback from the tubes will finish filling the lifters (from the side) and they quiet down on the next fireup.
If it doesn't stop soon after, it's time to do some diagnosing.
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  #7  
Old 22nd February 2020
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I had to ride mine four or five miles once when I didn't soak them properly.
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Old 22nd February 2020
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Quote:
Originally Posted by hexnut View Post
I had to ride mine four or five miles once when I didn't soak them properly.
+1, soaking the lifters, usually overnight, is the key.
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