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  • Cam belt de-laminated!

    Hi,

    I've just taken the timing cover off my 2.4 LN130 Surf to find a strip of smooth rubber about 6 inches long where the cam belt teeth have parted company from the belt. The belt hadn't actually snapped, the damage is where the belt goes around the crankshaft gear. The engine had previously fired up and then stalled after I'd gone forward about two yards.

    The belt was nowhere near due for replacement, the damage was probably a knock-on effect from a crankshaft pulley failure. The tensioner is in good shape.

    I've lined up the timing marks & fitted a new belt. I put the crankshaft bolt back on but was only able to turn the engine over manually about 3/4 of a full cycle before it seems to tighten up - I'm afraid to force it any further or reassemble it.

    Does this sound like bent valves or worse? Has anyone had to deal with this problem? Any help would be great, thanks in advance.

  • #2
    I'm afraid it sounds very like you may have some bent valves mate, if you are unable to turn the engine 2 full revolutions by hand and you are sure the timing marks are aligned correctly then it sounds like the valves are hitting the pistons.
    Sorry to give you news you didn't want to hear.
    Regards, John.

    Comment


    • #3
      that does not sound good mate just wanted to give u a chin up....
      One day at the time I guess..

      Comment


      • #4
        Thanks Bowella & Toby Jug, much appreciated - I guessed it looked like bad news.

        Today someone with a Hilux pickup said they used a timing mark on the crankshaft pulley/harmonic balancer, not the small notch on the gear. Sure enough, there's a white mark in a groove on the pulley & when I tried it on the shaft & lined it up at the 12 o'clock position it was a few degrees different from the notch on the gear.

        That's totally against what the manual says, but this bloke's just done the belt on his Hilux & it's running well. So out of desperation I took the belt off, fitted the balancer, lined up the three sets of timing marks using the mark on the balancer and...

        ... nowt! It still won't turn even one full revolution using a socket on the crankshaft bolt.

        Has anyone come across this mismatch with the mark on the crankshaft gear and the one on the harmonic balancer/pulley? I don't dare try it on the battery & we live miles from any garage so I'm on my own with it.

        Comment


        • #5
          Originally posted by Tagaki View Post
          Thanks Bowella & Toby Jug, much appreciated - I guessed it looked like bad news.

          Today someone with a Hilux pickup said they used a timing mark on the crankshaft pulley/harmonic balancer, not the small notch on the gear. Sure enough, there's a white mark in a groove on the pulley & when I tried it on the shaft & lined it up at the 12 o'clock position it was a few degrees different from the notch on the gear.

          That's totally against what the manual says, but this bloke's just done the belt on his Hilux & it's running well. So out of desperation I took the belt off, fitted the balancer, lined up the three sets of timing marks using the mark on the balancer and...

          ... nowt! It still won't turn even one full revolution using a socket on the crankshaft bolt.

          Has anyone come across this mismatch with the mark on the crankshaft gear and the one on the harmonic balancer/pulley? I don't dare try it on the battery & we live miles from any garage so I'm on my own with it.
          dont time it up with the mark on the pulley, time it with the mark on the belt gear, if the pulley damper is shot it will spin giving the wrong location
          JAP4X4PART ¬ THE BIGGEST SURF BREAKER IN THE UK ¬

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          • #6
            timing belt

            good luck mate
            JUST KEEP SURFING !!!!!!

            Comment


            • #7
              Remove the rocker cover and set the cam timing with belt removed. Rotate cam until both valves are closed on number one cylinder. IIRC this will be right when number four cylinder valves are rocking. Rocking means, if the cam is slightly rotated either way, one or other of the valves will begin to open. The timing mark should align when this is done.

              When the cam timing is set reinstall belt and align all mark up to spec. Do not use any marks on a pulley. Let us know how it goes. If the engine will not rotate then you may have major damage such as a broken conrod or something.

              Nev

              Comment


              • #8
                Cheers everyone for these latest posts - lord lucan, dj.spikey & Nifty Nev.

                Nev's advice has given me hope that all is not lost! We've got crap weather in these hills at present & the Surf lives outdoors, but as soon as it clears up I'll try that suggestion - and I won't use the marks on the pulley...

                I'll let you know how this goes ASAP.

                All the best

                Martin.

                Comment


                • #9
                  Better weather here at last, so got the rocker cover off today, just before a sudden hailstorm drove me back indoors!

                  Will try re-setting timing using Nifty Nev's good advice as soon as it clears up & will post the whole grisly tale here when it's done.

                  Comment


                  • #10
                    Right - the timing looks ok with the rocker cover off, the new belt's on & all the marks line up. The engine's very stiff under compression when turned over by hand, as it tightens up there's a metallic 'click' from the head area and then it moves again.

                    It's been standing since December & someone who works on Hiluxes has told me to expect it to be stiff & to try turning it over on the batteries - does that sound right? I'm worried about that click, it's not loud & there were no expensive noises when the belt went, but...

                    The biggest annoyance now is the idler wheel on a bracket that seems to be connected to the air-con pump - I can't get the timing cover over or round it and I can't see how to shift it without removing the whole air-con assembly, which I'd rather not do. The bolt on the idler wheel faces the engine, I can't get a socket near it & some bright spark previous owner or mechanic has rounded the edges off...

                    When I got the Surf that idler wheel wasn't doing anything, the nearest drive belt was a few mm away from it. I can't see it in the Oz manual either & it's not part of the section on changing timing belts. Has anyone got round this problem before? I'd be very grateful for any ideas.

                    Comment


                    • #11
                      Unbolt the Air Con Compressor leaving the hoses connected so you don't lose the gas and move out the way.

                      Nev

                      Comment


                      • #12
                        Thanks again NiftyNev - it looks like the a.c. compressor on mine is different from the drawing in my Max Ellery manual, on this truck the mounting bracket's more like a lump of iron from a Victorian lawnmower! I'll have to get the compressor off first, then the mounting which includes the arm & wheel that's getting in the way of fitting the timing cover.

                        Onwards and sideways! Thanks for not giving up on this, I haven't...

                        Comment


                        • #13
                          Onwards and sideways

                          Hi again,

                          Had some good weather, so got down to work & removed air-con unit as NiftyNev suggested - thanks again. Replaced timing cover & harmonic balancer. Went to replace fan belt pulleys on drive shaft & although I'd kept them separate from the fan pulleys when I removed them all, they've got mixed together while I've been working.

                          Question - one is a single unit with space for two belts, the other is two units held together when in place, also taking two belts - the bolt holes seem the same size & spacing on both. The manual doesn't help, so can anyone remember which goes on the drive shaft & which fits with the fan, or isn't it important?

                          Thanks in advance!

                          Comment


                          • #14
                            Originally posted by Tagaki View Post
                            Hi again,

                            Had some good weather, so got down to work & removed air-con unit as NiftyNev suggested - thanks again. Replaced timing cover & harmonic balancer. Went to replace fan belt pulleys on drive shaft & although I'd kept them separate from the fan pulleys when I removed them all, they've got mixed together while I've been working.

                            Question - one is a single unit with space for two belts, the other is two units held together when in place, also taking two belts - the bolt holes seem the same size & spacing on both. The manual doesn't help, so can anyone remember which goes on the drive shaft & which fits with the fan, or isn't it important?

                            Thanks in advance!
                            the single pulley with two belts is the water pump pulley.the other is the crank pulley for aircon and power steering.
                            www.overfab.uk

                            Comment


                            • #15
                              Originally posted by surfenstein View Post
                              the single pulley with two belts is the water pump pulley.the other is the crank pulley for aircon and power steering.
                              Correct. I doubt they would fit in the wrong place anyway.

                              Nev

                              Comment

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