Is My Oil Pump Binding? Help!
Thread Starter
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6th Gear
Joined: Jun 2023
Posts: 12
Likes: 10
From: Wyoming
Is My Oil Pump Binding? Help!
Was told to cross post my concern here, any advice is greatly appreciated.
Just looking for some advice on something that may seem a bit silly to even ask.
Am currently doing my first ever cam install on my 2018 Road King, and updated the oil pump to the latest and greatest from the MoCo while I'm in there. I just installed cam support plate and torqued all "outer" plate screws to proper spec, while the 4 "inner" pump screws were only snugged up, then rotated engine twice and torqued those 4 to spec too.
However, it feels like I'm getting slight resistance in 2 spots while rotating engine over, and getting the sound of air coming out of crank when I hit the slight resistance. Is this normal? Or did I mess something up reassembling new oil pump? Any help is greatly appreciated!
Just looking for some advice on something that may seem a bit silly to even ask.
Am currently doing my first ever cam install on my 2018 Road King, and updated the oil pump to the latest and greatest from the MoCo while I'm in there. I just installed cam support plate and torqued all "outer" plate screws to proper spec, while the 4 "inner" pump screws were only snugged up, then rotated engine twice and torqued those 4 to spec too.
However, it feels like I'm getting slight resistance in 2 spots while rotating engine over, and getting the sound of air coming out of crank when I hit the slight resistance. Is this normal? Or did I mess something up reassembling new oil pump? Any help is greatly appreciated!
Cruiser
Joined: May 2023
Posts: 125
Likes: 171
From: Florida & Michigan
However, it feels like I'm getting slight resistance in 2 spots while rotating engine over, and getting the sound of air coming out of crank when I hit the slight resistance. Is this normal? Or did I mess something up reassembling new oil pump? Any help is greatly appreciated!
Do you have the plugs pulled? If not, pull the plugs and rotate the engine over. Having the plugs pulled will relieve the cylinder compression when rotating the engine.
Road Warrior
Joined: Aug 2014
Posts: 1,937
Likes: 320
From: Vancouver, WA
I replied this to your other post.
You could be feeling the compression strokes and hearing the normal leakage going past your rings.
Edit: As said above, pull the plugs and try again.
You could be feeling the compression strokes and hearing the normal leakage going past your rings.
Edit: As said above, pull the plugs and try again.
Last edited by RG Pilot; Apr 24, 2024 at 08:53 PM.
Thread Starter
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6th Gear
Joined: Jun 2023
Posts: 12
Likes: 10
From: Wyoming
In any case, my main concern is the slight resistance I feel while rotating the wheel. It doesn't necessarily bind up per se, but I do feel like maybe it's a bit more effort than it should be?
Road Warrior
Joined: Sep 2016
Posts: 1,887
Likes: 1,059
From: SE Washington
Removing one plug is fine, though I recommend checking your top plugs for tightness.
Had the exact same slight resistance you described when I installed the S&S pump and plate in my 18. My crank runout was <.002 so I knew that wasn't an issue and I had plenty of assembly lube. Wasn't a big deal to repeat the process so loosened everything up, re tightened and it was exactly the same as before, just slight resistance in a couple spots. Finished the assembly, flashed the tune and enjoyed the ride.
Had the exact same slight resistance you described when I installed the S&S pump and plate in my 18. My crank runout was <.002 so I knew that wasn't an issue and I had plenty of assembly lube. Wasn't a big deal to repeat the process so loosened everything up, re tightened and it was exactly the same as before, just slight resistance in a couple spots. Finished the assembly, flashed the tune and enjoyed the ride.
Thread Starter
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6th Gear
Joined: Jun 2023
Posts: 12
Likes: 10
From: Wyoming
Removing one plug is fine, though I recommend checking your top plugs for tightness.
Had the exact same slight resistance you described when I installed the S&S pump and plate in my 18. My crank runout was <.002 so I knew that wasn't an issue and I had plenty of assembly lube. Wasn't a big deal to repeat the process so loosened everything up, re tightened and it was exactly the same as before, just slight resistance in a couple spots. Finished the assembly, flashed the tune and enjoyed the ride.
Had the exact same slight resistance you described when I installed the S&S pump and plate in my 18. My crank runout was <.002 so I knew that wasn't an issue and I had plenty of assembly lube. Wasn't a big deal to repeat the process so loosened everything up, re tightened and it was exactly the same as before, just slight resistance in a couple spots. Finished the assembly, flashed the tune and enjoyed the ride.
Last edited by Jones217; Apr 24, 2024 at 11:18 PM.
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Thread Starter
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6th Gear
Joined: Jun 2023
Posts: 12
Likes: 10
From: Wyoming
I may call FM tomorrow. I did purchase everything from them, I'm sure they wouldn't mind giving me a little friendly advice. Thanks!
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Seasoned HDF Member
Joined: Jan 2006
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From: Charleston, SC
You'll always experience a tiny bit of resistance at certain points when spinning the crank around. I've always though it was right around the point the pistons were changing direction. Doubt it's the oil pump dragging.
