Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Onan P220 oil pressure


  • Please log in to reply
5 replies to this topic

#1 Oak OFFLINE  

Oak

    New Member

  • Member
  • Member No: 5131
  • 7 Thanks
  • 14 posts

Posted October 15, 2016 - 07:49 AM

I just finished doing a complete rebuild on an Onan P220 and have a question on the oil pressure. I did not change the bypass spring and I'm running at 20 psi at 3400 rpm. Is this normal? Here is a vid of the first start.

 

https://www.youtube....h?v=EgdQ_-dg2Vk



#2 KennyP ONLINE  

KennyP

    FORDoholic

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2253
  • 28,508 Thanks
  • 39,733 posts
  • Location: Collinsville, Oklahoma

Posted October 15, 2016 - 08:25 AM

My P220 has 50 lbs. after warming up. 60 when cold.



#3 larrybl ONLINE  

larrybl

    Texas Member

  • Site Supporter
  • -GTt Supporter-
  • Contributor
  • Member No: 415
  • 4,955 Thanks
  • 3,328 posts
  • Location: Central Texas

Posted October 15, 2016 - 10:40 AM

Seems low, I did replace the by-pass spring on my N52M, and get almost 40 psi at idle. https://www.youtube....h?v=6m5CRK5diN8



#4 olcowhand ONLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,653 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted October 15, 2016 - 11:32 AM

Should be around 35psi+ at high speed with a tight engine.  20psi is a minimum acceptable pressure.



#5 Oak OFFLINE  

Oak

    New Member

  • Member
  • Member No: 5131
  • 7 Thanks
  • 14 posts

Posted October 15, 2016 - 01:34 PM

That's what I was afraid of. I didn't pull the pump apart but I think I measured the bypass spring and it was within spec. This engine has all new 20 over pistons, crank was turned 20 under with new rods also installed all new cam and main bearings too. Do you think I should just try a new bypass spring to see if that helps? What else could it be besides the pump or spring?



#6 larrybl ONLINE  

larrybl

    Texas Member

  • Site Supporter
  • -GTt Supporter-
  • Contributor
  • Member No: 415
  • 4,955 Thanks
  • 3,328 posts
  • Location: Central Texas

Posted October 15, 2016 - 03:21 PM

I would replace the spring first, always go from easiest to hardest. I had to remove my N52M 3 - 4 times chasing a oil pan leak, finally found the problem, I had swapped the 3" intake bolts with the 2-1/2" pan bolts, could not get the pan to seat.






Top