Question about 1995 Nissan Pickup

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Why is the lifters tapping and there brand new?

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  • jaysoncotton Mar 26, 2011

    When installing new lifters do you have to prime them?

  • jaysoncotton Mar 26, 2011

    Does new lifters need priming before installing?

  • jaysoncotton Mar 26, 2011

    Do you have to prime the lifters before you install them?

  • jaysoncotton Mar 26, 2011

    Why is new lifters tapping and do you have to prime them before installing?

  • jaysoncotton Mar 26, 2011

    DO lifters have to be primed before installing? why are they tapping if there brand new?

  • jaysoncotton Mar 26, 2011

    How do you prime the lifters before installing them?

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Lifter noise is typically the result of lack of oil to the lifters. If the noise you are hearing is at initial start up and then it goes away then this is normal operation. It is not uncommon for the lifter to bleed down when the engine is shut off and once the oil pressure pumps up the lifters it goes away. If that is not the issue then I would start by verifying that I have good oil pressure. Sometimes a fresh oil and filter change will help remove debris that could be blocking the lifters oil port. I would also caution you to be aware that the noise could also be coming from the valves in the head. If you have a higher mileage motor then that can also create a noise similar to a lifter tick. I would also consider the possibility that maybe the lifter didn't wear mate properly. There is a pretty big list of possibilities that can create a lifter type of ticking noise. but diagnostically speaking I would make sure the oil system is in good shape and then start questioning the mechanical condition of the heads and lastly perhaps installation errors. Sorry I cant be sure of exactly what is wrong without being able to do some hands on testing but this should help give you ideas of what can cause that issue. I hope this helped and good luck.

Posted on Mar 26, 2011

  • Paul Fleming Mar 28, 2011

    Yes you should prime new lifters before installing them. If you did not do that then that is probably why they are making noise. I assume that you don't want to have to remove them so I would probably let the engine warm up to operating temp and rev the engine up to try and raise the oil pressure high enough to pressurize the lifter. The ticking should dissipate.

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It sounds like the hydraulic lifters used in this model truck are not charged properly. If the head was laid on it's side for any length of time the lifters would have drained and it is difficult to get them to fill on their own. I had to pull each lifter and fill it manually then put them back on place. Make sure you keep track of which lifter is where. If you put them back in using the wrong order it could cause further issues.

Posted on Mar 26, 2011

  • James Young Mar 26, 2011

    yes, you have to prime the lifters before installing them.

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I'm assuming that the ones that replaced them knew what they were doing and they installed the correct ones: there are different sets, specially sorted for the particular wear of the engine - you must use the ones for the exact diameter of the sockets in the block or they will tap.
In the engine of this car the lifters are hydraulic - if they are tapping then something is wrong with the lubrication circuit of the engine.
Start by checking the quality of the oil - make sure they used the correct one. Then check the pressure given by the oil pump, the oil filter. Finally check the status of the oil lines and the seals on the lifters.
If all are ok then they used the wrong set of lifters - replace them with ones from a class higher = the ones with a slightly higher diameter.

Posted on Mar 26, 2011

  • Azrael SRL Mar 26, 2011

    No, they don't need to be primed - their sockets should fill wit oil in under a second the first time the engine is started. They tap because the pressure of the oil inside it is too low - most likely because the diameter of the lifter is smaller than the diameter of the socket in which it's situated.

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