Hydrolic tappet collapse
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Stage IV
Joined: Oct 2020
Posts: 4
Likes: 0
From: Ramona, Calif
Hydrolic tappet collapse
I have an 82 FXS, stock motor, just a super E carb and 2 into 1 exhaust. Every so often when cruising i will have a tappet collapse but it pumps back up fairly quickly. Why does it do this? Possible oil type problem? I use valvoline racing oil 20/50 wt because of the high zinc content. I live in so cal and probably should be using 60 wt. I do have an oil cooler installed also. Any feedback would be appreciated. I have had the tappets out and checked all the ball valves and found no issues.
Stellar HDF Member
Joined: Mar 2017
Posts: 2,597
Likes: 2,173
From: australia
when you had the units out, was it all nice and clean with no scoring inside the unit and plunger? Has the gauze filter near the timing chest been cleaned? when you clean the unit out and assemble it dry, does the check ball kick in and does the unit operate smoothly up and down with resistance when pressed with your fingers ?
Last edited by old mago; Apr 10, 2022 at 04:34 PM.
Thread Starter
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Stage IV
Joined: Oct 2020
Posts: 4
Likes: 0
From: Ramona, Calif
All internals look good, no scar'n, all ball valves ok, good pressure when squeezed. When i installed, all tappets were bled, i adjusted where i them to bottom where i could no longer spin the pushrod and see that its fully collapsed then back off that 1.5 turns on the nut. Lil noisey when first fired but stops immediately. Anything wrong with this adjustment method?
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
Your having noise issues
do not care for but many use that method -
now after its been run - we would re do the adjustment - like i explained max lift on one adjust the other - 3 turns down from the spot the lifter stops at top out
see what happened then
do not care for but many use that method -
now after its been run - we would re do the adjustment - like i explained max lift on one adjust the other - 3 turns down from the spot the lifter stops at top out
see what happened then
Tourer
Joined: Nov 2021
Posts: 480
Likes: 321
From: FL winter, northern MI summer
If you have one that is giving you problems, I would change it out, I have done this a couple times. Even though it seemed good, and held pressure when out, filled, and pushed by hand. When I replaced them, my troubles went away. They used to be real cheap, but surly a whole lot more now.
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Stellar HDF Member
Joined: Mar 2017
Posts: 2,597
Likes: 2,173
From: australia
All internals look good, no scar'n, all ball valves ok, good pressure when squeezed. When i installed, all tappets were bled, i adjusted where i them to bottom where i could no longer spin the pushrod and see that its fully collapsed then back off that 1.5 turns on the nut. Lil noisey when first fired but stops immediately. Anything wrong with this adjustment method?
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Stellar HDF Member
Joined: May 2018
Posts: 2,175
Likes: 435
From: australia
If you have one that is giving you problems, I would change it out, I have done this a couple times. Even though it seemed good, and held pressure when out, filled, and pushed by hand. When I replaced them, my troubles went away. They used to be real cheap, but surly a whole lot more now.
Club Member
Joined: Mar 2009
Posts: 66,131
Likes: 51,465
From: Niles Canyon Ca.
Drop the 20-50 and start running straight 50 or preferably 60. Won't stop one from collapsing but it will lower the odds and it does cut down on adjustment headaches and valve train noise in general.
