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Stuck lifter?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by UseYourBlinker, Oct 13, 2001.

  1. UseYourBlinker

    UseYourBlinker 1 ton status

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    I have a strange ticking coming from the driver side of the motor.It's really loud when started in the morning but quites down when driving.People have suggested it might be a stuck lifter...so what can I do?

    Dark Lotus-Tales from the Lotus Pod
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  2. chevyboy24598

    chevyboy24598 1/2 ton status

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    First take the vlave covers off and tighten all the lifters down. It shouldn't hurt it. Most Chevys run a little better when there loose.


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  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    There is a correct way for tightening lifters and it isn't "Just tighten them down" that's a good way to do serious damage to the engine. Some of that damage would include burt valves and damaged valve seats.
    First thing to check for is exhaust leaks. Check around the manifold where the meet the heads for any dark areas that are being stained by exhaust. Will have a Flat gray to dark gray apearence. Putting s flat blade scre driver in the edge will change the sound of the noise.
    The passenger side manifold is prone to warpage on Heat riser set ups. A heat riser is a flap in the passenger side exhaust at the down pipe. When cold (at start up) the flap closes and forces the exhaust back through the passage in the intake and out the diverside manifold. This is to preheat the carb to help get the engine running when cold. Some of these flaps are controled by a BiMetal spring on the flap some are controled by a vacume pot on the side of the engine.
    This tends to build heat in that manifold and sometimes they can warp causing the seal to fail. I would suspect a exhaust leak there or where the down pipe heat riser and manifold meat. Sometimes the bolts will back off and it will leak giving a poping/clicking type nosie simular to what a lifter would sound like if it did not have the proper preload.
    With todays' oils and proper changes stuck lifters are rare. However stuck valves are not with all the crap they put in gas these days. Vehicles that sit or are short tripped sometimes have this happen. The gas will get stale and the chemicals will start to carbon up the valves since they don't get run hard to burn it off. If no exhaust leak then before ripping into stuff try running some "Top end engine cleaner" through the truck. It's available at any GM dealer. That stuff works wonders and may cure the problem. Regardless it will not hurt to run it through and clean up then intake system. Plan on replacing plugs after wards. Mariginal plugs may give it up and start missing after a treatment.
    If it still persists then it's time to check the valve lash / lifter preload. It would be best to buy a shop manual. even the cheapo Haynes for $14 at most parts stores covers adjusting the preload. Folow it step by step. I have done this a few times on various cars and I always have the manual in hand and follow it.



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  4. chevyracing

    chevyracing 1/2 ton status

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    Pull the valve cover on that side, turn the engine so both valves are closed then check the lash. If the lash is okay then turn the engine till the valve is open or should be open and check for lash. Also measure how far the lifter rises according to the other lifters, you may have a cam lobe going flat. When you start the engine make sure the push rods are all spinning, if not that is an indication you have a lifter going south.
    John
    Just a guess.

    Like to go sloppin' 'round in da mud in a rapid fashion....=) [​IMG]
     
  5. chevyracing

    chevyracing 1/2 ton status

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    Oh yeah, I forgot. Something else to check is the valve spring retainers. If you lost a retainer and the spring is popped up higher than the valve you will get a ticking noise as the spring compresses and the rocker contacts the valve stem. That is bad. If you catch it soon enough damage may be minimal but try to lacate the pieces of the retainer.
    Good luck........

    John

    Like to go sloppin' 'round in da mud in a rapid fashion....=) [​IMG]
     
  6. Pure Insanity

    Pure Insanity 1/2 ton status

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    It also sounds like the lifter could be bleeding down overnite, and losing its prime. After you run it a bit it pumps back up and goes away.

    If ya can't stop.......Smile as you go under! [​IMG]
     
  7. UseYourBlinker

    UseYourBlinker 1 ton status

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    Thanks for the info.

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  8. RedDwarf

    RedDwarf 1/2 ton status

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    Drain your oil and replace it with ATF. Run it for a few minutes and drain it again. Then change filter and oil to synthetic. Synthetic usually has really good detergents and superior penetrative abilities. This will clean the varnish from your lifters and keep them from sticking as well as clear out the oil passages in the lifters so they will pump up quicker and take out that "cold start clack".

    It's worth a try.

    Still Poundin' "pavment" after all these years!!! [​IMG]
     

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