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    #1

    Clogged oil filter

    Would having a clogged oil filter give you a low or high pressure reading at the filter cover oil test point? I am thinking that a clogged filter would give you a high pressure reading, because the pump would be pumping into a restricting filter? And if the filter (Hiflo) gets clogged and the bypass in the filter come into play, would that cause the oil pressure to drop? If I check the pressure pass the filter, would that be a better spot to check the oil pressure?
    Thanks.
    Will
    Tags: None
    #2
    The oil flows from the inside of the filter to the outside and then back into the sump as filtered oil.

    And just what pressure checking fixture are you talking about?

    All that's on the cover far as I know of is a drain plug so when changing the oil its not full and gushing all over as you remove the cover.

    If you want to check the oil pressure, you attach a gauge at the big bolt that's at the very bottom of cylinder 4. This bolt caps off the main oil journal that feeds the entire engine.
    Last edited by chuck hahn; 07-09-2013, 01:33 PM.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

    Comment

      #3
      Oh and the "normal" oil, pressure on an GS is in the range of 6 PSI or so..not very hih like say a car would be.
      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

      NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

      Comment

        #4
        The 650s are not roller bearings, are they?

        Oil pressure should be much higher?


        Life is too short to ride an L.

        Comment

          #5
          I am checking the oil psi where the service manual states. The drain plug on the oil filter cover. I drilled and tapped a 10-32 threaded hole in the plug bolt, I then attached a psi gauge. The manual states 43 to 78 oil psi.The pressure is fine for some time but slowly drops off to below 40 psi and at that point it starts to get noisy. And the 650s have non roller bearings cranks.

          Comment

            #6
            Tom...I stand corrected. I keep thinking in terms of the roller bearing cranks that my bikes are. I will shut up now..LOL


            This is from the manual on Cliffs website for the 650G manual

            43 PSI minimum to 78
            MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
            1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

            NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


            I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

            Comment

              #7
              Try it with a new filter and oil I would say.
              MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
              1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

              NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


              I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

              Comment

                #8
                "I am checking the oil psi where the service manual states. The drain plug on the oil filter cover"

                Really? you sure it's not a translation error? I thought it was 43-70 at pump outlet But yeah try a new filter. The "noisy at 40psi " is odd though- how many miles on this critter?
                1981 gs650L

                "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                Comment

                  #9
                  Originally posted by tom203 View Post
                  "I am checking the oil psi where the service manual states. The drain plug on the oil filter cover"

                  Really? you sure it's not a translation error? I thought it was 43-70 at pump outlet But yeah try a new filter. The "noisy at 40psi " is odd though- how many miles on this critter?
                  not that i know anything about the 650 motors but i just looked in the 650G service manual in Basscliff's site and the OP is indeed correct.
                  "connect oil pressure gauge to the adapter hole in the oil filter housing"
                  1978 GS1085.

                  Just remember, an opinion without 3.14 is just an onion!

                  Comment

                    #10
                    Originally posted by chuck hahn View Post
                    The oil flows from the inside of the filter to the outside and then back into the sump as filtered oil.

                    And just what pressure checking fixture are you talking about?

                    All that's on the cover far as I know of is a drain plug so when changing the oil its not full and gushing all over as you remove the cover.

                    If you want to check the oil pressure, you attach a gauge at the big bolt that's at the very bottom of cylinder 4. This bolt caps off the main oil journal that feeds the entire engine.
                    This is incorrect. The oil flows from the outside of the filter to the inside. That is why the pressure relief valve on the end moves in under pressure to bypass the filter. It then flows to the sending unit and to the engine to lubricate everything. Only then does it drain back to the sump where it can be picked up and filtered again.

                    Comment

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