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  3. Specialty Forums

    1. Turbo Grand Prix

      This forum is for enthusiasts of the rare 1989-90 Pontiac Grand Prix Turbo.

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      A forum for information and discussion about the Oldsmobile Cutlass Supreme Convertible

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  • Posts

    • mycarsucks
      Swapping out rod bearings without taking engine out

      By mycarsucks · Posted

      i dont see why it would matter which bearing is making noise if im taking the pan off im replacing all rod and main bearings and also polishing the crank,,,  ive seen bearing rolls on 350 small blocks with louder knocks and higher mileage and never had an issue so this shouldnt be much different i just want to know if you can in this motor because some motors you cant push the bearing around to the other side of the crank
    • 55trucker
      Swapping out rod bearings without taking engine out

      By 55trucker · Posted

      Pick up a stethoscope, get under the car & search for the loudest point under & alongside the oilpan for the knock volume. At idle there won't be a significant amount of damage outside of what already has happened. you should really find out what the engines oil pressure is, seeing as you say this IS a high mileage item, ALL of the bearing (both crank & cam) clearances are more than likely opened up, the pump may be a question mark, replacing just the con rod shells won't be the cure.
    • mycarsucks
      Swapping out rod bearings without taking engine out

      By mycarsucks · Posted

      Idk which one it is and I dont really want to run the engine any longer to risk damaging the crank or the rod.. It noticed it knocking at 2000rpms after I went full throttle to avoid an accident on the interstate on the way home from work... Motor has high mileage so i bet it just didnt have enough oil pressure to keep the bearing lubricated at 5200ish rpms. Time to roll in some new bearings if the crank isnt damaged but I doubt it is because you can only hear the knock over 2k rpms
    • 55trucker
      Swapping out rod bearings without taking engine out

      By 55trucker · Posted

      My 1st thought is ....what has caused a bearing started to knocking? They don't do so because they like to....... The most obvious answer would be ......poor oil pressure. which bearing is the one that has the knock? Front of the engine or rear.......  
    • 94 olds vert
      Swapping out rod bearings without taking engine out

      By 94 olds vert · Posted

      It appears you can raise the engine enough to clear the oil pan with the subframe in place on a 3100. 
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