Tapping noise 1974 FLH
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Road Warrior
Joined: Sep 2007
Posts: 1,252
Likes: 142
Tapping noise 1974 FLH
I am pulling my hair out trying to find this tapping noise in the 74 FLH. What is it. The motor has about 700 miles on it. Im running 60 wt oil with solid lifters. Compression is 150 psi in each lung, and the noise really doesn't start unitll the oil temp is about 150+ def. F. What is it? Its driving me nuts trying to find it. A stethoscope doesn't help its all over the top end. Valves are set perfect. New lifters and pushrods. When the temp of the oil is 200 deg F. its loud. Really loud. Below 150 you can barely hear it.
randy
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,610
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From: Cental, MI
^^ Agree...and I can't decide if I hate the Whine or the Tick worse!!!!
Gonna be some parts swapping and serious experimenting to change that..
Unless the cam is obviously the wrong tooth profile...Like for a late Model.
Gonna be some parts swapping and serious experimenting to change that..
Unless the cam is obviously the wrong tooth profile...Like for a late Model.
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Road Warrior
Joined: Sep 2007
Posts: 1,252
Likes: 142
I never touched the rocker boxes. Guess that is where I should start. The noise seems to be toward the front more than back and high up I just wish I didn't have to pull the heads to check them
Randy
Randy
Stellar HDF Member
Joined: Apr 2007
Posts: 3,008
Likes: 464
My 76 FLH had the cam gear whine for years. Just last month I replaced the cam gear with Andrews undersize gear. Andrews only makes 1 undersize and one oversize, along with the standard size.
It is quieter now. I hated the whine. It still has the normal shovel whine a little bit, but not the loud whine.
It is quieter now. I hated the whine. It still has the normal shovel whine a little bit, but not the loud whine.
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Road Warrior
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From: la la land jerzey
before removing the heads try this - you need gloves its going to be hot
take the 2 pusrods in the front out - then use the intake push rod that is shorter and see if you can walk the rocker shaft back and forth ( right to left ) with a warmed up motor and no radio on in the shop you can hear the sound and feel how much side to side you have
you need to puch up as you walk it back and forth
the spec is around .010 so it should just about move if it clicks back and forth then go for the heads again - shims come in a couple of sizes like .003 .005 /.007
NOTE - if you find a wavey washer in the rocker assembly you need to remove them as they brake and cause all kinds if issues
take the 2 pusrods in the front out - then use the intake push rod that is shorter and see if you can walk the rocker shaft back and forth ( right to left ) with a warmed up motor and no radio on in the shop you can hear the sound and feel how much side to side you have
you need to puch up as you walk it back and forth
the spec is around .010 so it should just about move if it clicks back and forth then go for the heads again - shims come in a couple of sizes like .003 .005 /.007
NOTE - if you find a wavey washer in the rocker assembly you need to remove them as they brake and cause all kinds if issues