High oil pressure after S&S cam chest upgrade - P0523

[Flyinhi]

Hi Guys/Gals,

Looking for some ideas for a problem I'm having.

Installed a S&S camchest kit on my '17 Road King. Install went went, taking my time, watching several videos to ensure all steps followed to a tee, clean workspace, lots of assy lube and preloaded lifters. I now have an oil light on and registering P0523 - high oil pressure.

• installed new S&S components
  
  
  • oil pump (verified oil cooled version)
  • cam plate with chain tensioner
  • 475c cam and bearing
  • lifters
  • tappet cuffs
  • 55mm intake manifold
  • adjustable pushrods
• 3 hole oil change using Amsoil including filter
• started bike with no concerns
• started a couple additional times and loaded onto trailer with no issue
• trailered to dyno guy to have tuned with decent results of 103hp, 113 torque
• trailered home and oil light came on
• checked codes and have a P0523 - high oil pressure
• reached out to both the tuner and S&S to see if they have any ideas
  
  
  • tuner stated tune wouldn't affect oil pressure (makes sense)
  • S&S said the check the oil pump pressure relief valve to see if stuck and to verify .200" measurement of thread showing from base
• checked actual oil pressure with gauge at pressure switch (hoping for just a bad sensor)
  
  
  • oil pressure was measured very high at 60psi at idle and jumped to 90 with a quick twist of the wrist
• removed cam cover
• visual check - all looks normal and oil clean with no debris
• removed the oil pressure relief valve
  
  
  • measured correct at .2" which should equal 45 psi (as per S&S)
  • removed valve, removed spring and checked plunger is moving freely in the bore
• I have stopped here to see if anyone has any ideas and have reached back out to S&S to see what they have to say

Odd that the oil light didn't come on right away, maybe a blocked oil filter, idk...


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[Tacocaster]

Pressure relief valve is the first thing that comes to mind but you're sure that's good. Would you consider re-installing the original cam plate just to eliminate the S&S plate?

[Flyinhi]

Hopeful the cam plate is fine but who knows and worth a check. I'm going to start by swapping out the oil filter (just incase) and totally backing off the relief valve just to see if there is a change. One gent, on another forum, mentioned that S&S has been having some issue with the bypass valve on the oil pump but I'm not smart enough to understand if the bypass opening early would make the oil pressure shoot up. If I do need to pull apart the remainder of the cam chest then I will test both the relief valve and bypass to see what pressure they open up at and will also check all of the passages on the cam plate to ensure free and clear. Hopefully just a sticky plunger in the relief valve but they maybe wishful thinking. I will be sure to post the final result to help others who may run into the same issue. I have googled and can't find anything. 

[JSD]

Oil filter is worth a chop and check. The bypass should open in filter if blocked. Also I would test the oil pump relief valve spring pressure.

[Flyinhi]

Thanks JSD. Oil filter has been replaced and will chop the old one to take a look. Haven't put it back together yet to see if it corrected the issue. 

[JSD]

You should find some more power after finding the problem as less drag . One thing is the relief valve by pass passage clear ? 

[Flyinhi]

Thanks! If I have to pull it back apart will have both the pressure relief and bypass checked with air pressure plus have the actual plate checked as well to ensure passage ways are clear. 

[kd]

Thanks! If I have to pull it back apart will have both the pressure relief and bypass checked with air pressure plus have the actual plate checked as well to ensure passage ways are clear.

Did you recheck the mounting fastner torque (and sequence)?  As you probaly know, a mistep in torue and / or torque sequence can effect the shape and stability of the cam plate and the operation of the valves with changes in heat expansion.

[Jamie Long]

The DTC P0523 is "voltage high" from the oil pressure sensor circuit, not oil pressure high

[Coyote]

Bad sensor or open wire from the sensor.

[JSD]

OP says he fitted a gauge and tested the oil pressure and 90 psi is way too high 

[Flyinhi]

UPDATE: A good evening in the shop today. Oil light is out and hot the oil pressure is sitting at 20psi. Have not been able to test cold so will do that tomorrow. It appears the combination of the light being on and seeing 60psi at cold start was making me more worried than needed. I did replace the oil pressure sensor and clear codes to get the light to go out. Another update to come in the next day or so. Once again, appreciate all the help!!

[JSD]

That's a big difference from 60 psi & now 20 psi. Same gauge used?