Loud Clanking and rough idle

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  • KelseyM
    Low Range
    • Oct 2007
    • 89

    #16
    I believe I hear it faintly when the engine is at idle, but it really only appears when the engine is under load. If I rev the truck I can hear it but it has to be a pretty high rev.

    scatterling- it makes the noise in netural, with or without the clutch in. Yes only on the gas, when I come off the throttle in gear it goes away.

    Heres the strange part, I just took the valve cover off (for the 3rd time today haha) and the engine started right up. Idled great, but when I put it back on I couldnt get her to start...

    I feel like the sound is coming right from above cyl 2 or 3. I am thinking about pulling the head off tomorrow if its not raining to bad. How big of a task is this that I am thinking of taking on? I mean I know its not going to be done in 10 min but I suppose I dont really have a choice if I want to find out the problem.
    Kelsey M
    1989 Range Rover Classic
    1971 Series 2A 88"

    Comment

    • Cutter
      4th Gear
      • Feb 2009
      • 455

      #17
      Get an automotive stethoscope and try to pinpoint the sound. I never had issues with the engine not running. The knocking wasnt evident until the oil warmed up and there was a load. I just drove mine until it got so loud I knew exactly what it was, not a great idea. Had to have Matt at Overland rebuild a significant amount of the ways they were so chewed up.
      _________________________________________
      1986 3.5l 110 SW Austrian Feurwehr

      Comment

      • Momo
        3rd Gear
        • Dec 2006
        • 347

        #18
        Kelsey, it sounds like a con rod knock to me. Too synchronous and too "dense" a noise to be a loose mount or exterior component. Not pinging, it's too isolated for that. If it is a connecting rod bearing versus a main bearing, that isn't any better news because once you have the bottom end opened up you are going to want to rebuild the whole thing. How much oil pressure are you getting?
        '60 SII Station Wagon
        '64 SIIA 109 Regular
        '68 SIIA 88 Station Wagon

        Comment

        • KelseyM
          Low Range
          • Oct 2007
          • 89

          #19
          At idle about 25psi and normal driving 50...I am assuming that to replace both of these I will have to pull the motor correct? I am at work and dont have my bibles with me.
          Kelsey M
          1989 Range Rover Classic
          1971 Series 2A 88"

          Comment

          • rwollschlager
            5th Gear
            • Sep 2007
            • 583

            #20
            when my head gasket blew this winter it sounded very similar, it idled fine but as soon as rpms increased there was the knock. Check the oil for coolant and the coolant for oil, and do a compression test of each cylinder.

            -Rob
            ------------------------------------------------
            72 SIII 88
            67 SIIA 109
            82 SIII Stage 1 V8
            -- http://www.youtube.com/barnfind88 --

            Comment

            • KelseyM
              Low Range
              • Oct 2007
              • 89

              #21
              I will check it out when I get home...

              Is it possible the timing chain could have slipped?
              Kelsey M
              1989 Range Rover Classic
              1971 Series 2A 88"

              Comment

              • I Leak Oil
                Overdrive
                • Nov 2006
                • 1796

                #22
                Originally posted by KelseyM
                I will check it out when I get home...

                Is it possible the timing chain could have slipped?
                It's a rover...anything is possible!
                Jason
                "Clubs are for Chumps" Club president

                Comment

                • KelseyM
                  Low Range
                  • Oct 2007
                  • 89

                  #23
                  Haha, very true.

                  I started the rover up just now, after getting the truck slightly warm so it would stay running(rough) I started pulling plugs to see if the idling would make a difference. Cylinder 1 and 2 did not seem to make any difference when I pulled them.

                  I am going to pull apart the distributor to see if it is the weights, is there any way to tell if they are unbalanced?
                  Kelsey M
                  1989 Range Rover Classic
                  1971 Series 2A 88"

                  Comment

                  • LaneRover
                    Overdrive
                    • Oct 2006
                    • 1743

                    #24
                    Originally posted by KelseyM
                    Haha, very true.

                    I started the rover up just now, after getting the truck slightly warm so it would stay running(rough) I started pulling plugs to see if the idling would make a difference. Cylinder 1 and 2 did not seem to make any difference when I pulled them.

                    I am going to pull apart the distributor to see if it is the weights, is there any way to tell if they are unbalanced?
                    Not sure about the unbalanced part. Mine were 'frozen' in place. I took them out, sprayed them with 'breakfree' made sure I wiped them off and then put them back. No more dieseling under load.
                    1958 107 SW - Sold to a better home
                    1965 109 SW - nearly running well
                    1966 88 SW - running but needing attention
                    1969 109 P-UP

                    http://www.facebook.com/album.php?ai...2&l=64cfe23aa2

                    Comment

                    • KelseyM
                      Low Range
                      • Oct 2007
                      • 89

                      #25
                      Oh ok, I miss read your previous post. Ok I am going to pull them now and let you guys know how I make out...

                      I checked my fluid, does not look like a head gasket oil and coolant are clean.
                      Kelsey M
                      1989 Range Rover Classic
                      1971 Series 2A 88"

                      Comment

                      • SafeAirOne
                        Overdrive
                        • Apr 2008
                        • 3435

                        #26
                        Originally posted by KelseyM
                        I checked my fluid, does not look like a head gasket oil and coolant are clean.

                        That doesn't rule out the head gasket--it could be burned out between your #1 and #2 cylinders (see the non-Rover example below). I'd just do a compression test.

                        --Mark

                        1973 SIII 109 RHD 2.5NA Diesel

                        0-54mph in just under 11.5 minutes
                        (9.7 minutes now that she's a 3-door).

                        Comment

                        • Bostonian1976
                          5th Gear
                          • Nov 2006
                          • 750

                          #27
                          Originally posted by SafeAirOne
                          That doesn't rule out the head gasket--it could be burned out between the #1 and the #2 pistons. I'd just do a compression test.
                          Mark what do you know about head gaskets?
                          '67 sort of station wagon (limestone), '65 gray hardtop, '63 blue Station Wagon, '64 limestone station wagon in pieces

                          Comment

                          • SafeAirOne
                            Overdrive
                            • Apr 2008
                            • 3435

                            #28
                            Originally posted by Bostonian1976
                            Mark what do you know about head gaskets?

                            Touche.
                            --Mark

                            1973 SIII 109 RHD 2.5NA Diesel

                            0-54mph in just under 11.5 minutes
                            (9.7 minutes now that she's a 3-door).

                            Comment

                            • KelseyM
                              Low Range
                              • Oct 2007
                              • 89

                              #29
                              Could be, I just took apart the distributor, and reassembled it. Everything looked to be in order, and afterwards the truck started right up and idled much better than previously. However I could still remove both spark plug wires and it idled the same.

                              I dont have a compression tester, I will have to pick one up tomorrow
                              Kelsey M
                              1989 Range Rover Classic
                              1971 Series 2A 88"

                              Comment

                              • LaneRover
                                Overdrive
                                • Oct 2006
                                • 1743

                                #30
                                Originally posted by KelseyM
                                Could be, I just took apart the distributor, and reassembled it. Everything looked to be in order, and afterwards the truck started right up and idled much better than previously. However I could still remove both spark plug wires and it idled the same.

                                I dont have a compression tester, I will have to pick one up tomorrow
                                But does it still knock under a load?
                                1958 107 SW - Sold to a better home
                                1965 109 SW - nearly running well
                                1966 88 SW - running but needing attention
                                1969 109 P-UP

                                http://www.facebook.com/album.php?ai...2&l=64cfe23aa2

                                Comment

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