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Timing Belt Basics Revisted 200

posted by  starsandbars on  Wed Jun 26 18:34 CST 2013
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last visit: Thu Apr 24 20:55 CST 2014
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The timing belt on my 1991 with 138K miles has slipped/jumped maybe 6 times in the last 2 months. Replaced the belt initially, the tensioner appeared to have a strong spring so I kept it. I will get the car in time and the car will run fine. Then on start up later the belt would have slipped and the engine will be out of time. At this moment I do not know what to do. I will replace the tensioner. Is there anything else that can cause the timing belt to jump? My ass is kicked.

Thanks

--
1983 242 GLT / 1991 244 / 1993 245 / 1999 v70








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    Timing Belt Basics Revisted 200

    posted by  Peetz on  Thu Jun 27 09:54 CST 2013
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    last visit: Thu Oct 9 10:18 CST 2014
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    Assuming the spring on the tensioner is good, and the tensioner moves freely when it's lock nut is released, then follow the green book advice.
    Install the belt, start the engine, idle it for a few minutes. Shut it off, then pop the plug out of the timing cover and release the lock nut, and then tighten it again. Repeat at 500 miles or so.
    That's all you have to do.








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    Timing Belt Basics Revisted 200

    posted by  pageda on  Wed Jun 26 18:37 CST 2013
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    Is there a bolt on the tensioner to lock it down?
    Dan








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      Timing Belt Basics Revisted 200

      posted by  starsandbars on  Wed Jun 26 18:53 CST 2013
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      Yes, I would tighten the bolt and go back and retighten a few days later.
      --
      1983 242 GLT / 1991 244 / 1993 245 / 1999 v70








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        Timing Belt Basics Revisted 200

        posted by  pageda on  Wed Jun 26 18:55 CST 2013
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        There should also be a flat washer and should be torqued to specs? Torque to 50 Nm (37 ft-lb).
        Dan








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          Timing Belt Basics Revisted 200

          posted by  starsandbars on  Wed Jun 26 19:10 CST 2013
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          Yes, the washer is there. Did not use a torque wrench but I did lean on it pretty hard. I am sure that I met or exceeded the torque requirement. I do have a wrench and will torque to correct specs when I install the new tensioner.
          --
          1983 242 GLT / 1991 244 / 1993 245 / 1999 v70








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            Timing Belt Basics Revisted 200

            posted by  Volvo From Heck on  Wed Jun 26 20:19 CST 2013
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            last visit: Mon Oct 13 20:56 CST 2014
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            After you released the hold down nut to allow the tensioner to contact the belt did you rotate the motor (by the lower pulley bolt)at least a few inches to get all the slack on the tensioner side--and then tighten the tensioner nut? Did you spin the tensioner pulley to check for smooth operation (more important than the spring tension--a part I've never had to change on any of the many, many redblocks I've worked on) of the tensioner bearing? Is the tensioner seated to the block square with the pin fully home in the receiving hole? -- Dave








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              Timing Belt Basics Revisted 200

              posted by  starsandbars on  Wed Jun 26 21:03 CST 2013
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              I did not do the first part, the rotating of the lower pulley belt, I will go back and do it again. The tensioner pulley turns very smoothly. I also checked the seating of the tensioner in the receiving hole. I am very sure that the problem is one of technique rather than part failure. Thanks for your help. The car is running now.
              --
              1983 242 GLT / 1991 244 / 1993 245 / 1999 v70








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                Timing Belt Basics Revisted 200

                posted by  pageda on  Thu Jun 27 05:06 CST 2013
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                last visit: Fri Oct 24 13:18 CST 2014
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                This is what I do to insure the belt is as tight (no Slack) as possible.

                From the FAQ's

                loosen the tensioner locknut, rock the crank slightly clockwise about 1/8 turn (this makes sure that belt has tension on the drive side between cam and crank gears), and tighten and retorque the locknut. [Editor] Make sure you lock that tensioner nut to prevent the tensioner from loosening and destroying the new belt. Torque to 50 Nm (37 ft-lb).

                Dan







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