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evo lifter noise
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  #1 (permalink)  
Old 09-24-2017, 09:19 AM
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evo lifter noise

i'm needing you help again.

i have noticed some strange clattering noises coming seemingly from the mid section of my 1999 evo engine.

this sound is quite audible when the engine is hot and at idle. engine cold no noise. when reving the engine it is slightly audible but less pronounced.

after some searching with a stethoscope, i found that the rear lifter block was making this sound. front lifter block section seems ok

just to make sure i took of the gear case cover but found nothing loose.
i also cleaned the tappet screen filter

is something wrong with the rear lifters/lifter block?


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  #2 (permalink)  
Old 09-24-2017, 01:07 PM
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You need to remove and expect everything from the, correct oil, condition of oil rockers,cam ,pushrods, lifters, and lifter bores for wear. Any of the above can be the source of your problem. Would not continue to operate until repaired.
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Old 09-27-2017, 08:48 AM
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got to start somewhere so, i started removing bits here and there to have better access to the push rods/lifter blocks.
non adjustable push rods are installed. what's the best way to cut these -- dremel disk, metal hacksaw?
i'm thinking of putting in adjustable ones.
also noticed that with the rear cylinder in tdc position the inner push rod turns easily but the outer one is tighter and needs a more effort to turn.

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Last edited by wolfchopper; 09-27-2017 at 09:03 AM..
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Old 10-08-2017, 07:16 PM
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bolt cutters
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Old 10-09-2017, 07:25 AM
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Yes we use bolt cutters in the shop to cut them. I would inspect the tappet rollers in my hand look for scarring on the roller and excessive play on the rollers axle. Most of the time the lifter fails and kills the bearing in the roller. HD recommends replacing EVO lifters at 30K with a stock cam. Ultima says 15-20K max on their engines with the high lift cams that come in them. Replace all 4 while you are there. I prefer OE HD lifters or S&S. I have not had great luck with the big axle Jims they are twice as much and do not seem to last any longer.
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Old 10-10-2017, 12:04 PM
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just got my bolt cutter to cut through the pushrods. i'm still waiting for the adjustable 'quickee' pushrods I ordered to arrive.
the lifters/tappets I received today. I bought feuling ones. I hope they are ok with no inherent problems.

should I replace the front lifters/tappets at the same time? they don't make any special
worrisome sounds.


what are the torque specs for the lifter/tappet block 4 screws?

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Last edited by wolfchopper; 10-10-2017 at 11:05 PM..
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Old Yesterday, 06:49 PM
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Yes replace all 4. Get a good look at the cam to be sure it hasnt had the hardness worn from a bad lifter. Id change te cam bearing while you are in there. The HD part # is 9058 its just cheap insurance and you are basically right there.
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