Results 1 to 4 of 4
  1. #1

    Default Low oil pressure at idle on 6.2

    I purchased 2 brand new, not rebuilt, 6.2 long blocks with oil pan and water pumps. They were put in a 2001 Sea Ray 340 with V drives. I am using the correct 25w 40 mercruiser oil. Correct amount of oil in both engines and new AC oil filters. I have installed 0 to 60 psi mechanical gauges, that read in 1 pound increments, on both engines. I ran both engines at the recommended break in rpms and times. I have installed new oil pressure sending units and low oil pressure alarm sending units on both engines. Both engines read identical temperatures and oil pressure temperatures throughout the rpm range, double checked with an infrared temp meter. I am getting the following oil pressure readings.
    Cold start - 48 psi port / 38 psi starboard
    1 hour at 2200 rpm 44 psi port / 35 psi starboard
    At idle after 1 hour at 2200 rpm 44 psi port / 9 psi starboard
    1 hour at 3,800 rpm 42 psi port / 30 psi starboard
    At idle after 1 hour at 3,800 rpm 25 psi port / 4-5 psi starboard with low oil pressure alarm on.
    I am being told by the company I bought the engines from that this is normal and at idle they only need 2 psi. Even though the low oil pressure alarm is on. Need some advice on what is going on with this starboard engine.

  2. #2

    Default Re: Low oil pressure at idle on 6.2

    Hello, did you find the problem/solution? I’m having same problem

  3. #3

    Default Re: Low oil pressure at idle on 6.2

    Quote Originally Posted by LeeL View Post
    Hello, did you find the problem/solution? Im having same problem

    Did either of you have any luck? I have the same issue with a 5.7 reman

  4. #4
    Join Date
    May 2015

    Default Re: Low oil pressure at idle on 6.2

    Could be the pressure relief valve, usually in the oil pump. Since these are remanufactured engines, could be an oil passage plug, removed for cleaning, wasn't reinstalled. 2 psi at idle on a remanufactured engine is not normal. Excessive bearing clearances can also be the cause. Usually rod or main bearings, but could be cam bearings. To check the rod & main bearings, pull the pan, get some Plastigauge. https://www.plastigaugeusa.com/how.html
    If these are gas engines, a high volume or racing oil pump could help.

Similar Threads

  1. low fuel pressure, fast idle
    By Brandon Mayberry in forum Mercruiser Sterndrive Forum
    Replies: 0
    Last Post: 07-03-2015, 06:55 PM
  2. TAMD40 Oil pressure drops, will not idle.
    By glen_adolph in forum Volvo Penta Diesel
    Replies: 1
    Last Post: 07-28-2012, 02:42 AM
  3. 453 low oil pressure at idle
    By logger in forum Detroit Diesel
    Replies: 7
    Last Post: 02-14-2010, 01:12 PM
  4. Low oil pressure idle amp tapping AQ145B
    By bigbobbyb in forum Volvo Penta Gas Archive
    Replies: 7
    Last Post: 06-08-2009, 10:52 AM
  5. 454 hot idle problem and oil pressure drop and alarmhelp
    By toddster in forum Mercruiser Sterndrive Archive
    Replies: 1
    Last Post: 09-30-2008, 01:14 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts