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Caterpillar M315 strange engine noise

Discussion in 'Excavators' started by Aleš Tomažič, Aug 9, 2022.

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  1. Aleš Tomažič

    Aleš Tomažič Member

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    Hi to you all, i have one question about engine noise coming from excavator.

    I'm in process of purchasing an old 1999 Caterpillar M315 with cat c4.4 engine, and after testing it, everything works great, hydraulic is strong, but engine is having strong very loud whistling (chaining) noise, which is coming from the right side of engine, where alternator is (noise is not coming from alternator). I know that this engine doesn't have timing chain, but the noise is like timing chain is rubbing on something. The owner is saying that this is normal sound of this engine but i doubt that. Should i be worried?
     
  2. Vetech63

    Vetech63 Senior Member

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    Is the noise all the time the engine is running from idle through high idle, engine load and no load?
     
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  3. Nige

    Nige Senior Member

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    Does the engine have a turbocharger.? Could the noise you hear be an air leak somewhere after the turbo and before the engine, or maybe the turbo itself.?
     
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  4. Vetech63

    Vetech63 Senior Member

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    I was heading that same direction
     
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  5. Aleš Tomažič

    Aleš Tomažič Member

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    Hi Vetech63, yes, you can hear noise all the time, on idle, high idle and on load, but on idle is not so loud.

    Hi Nige, yes engine has turbocharger, but the noise is not coming from turbo, the turbo is located in the middle of the engine and it's in front of you, if you open engine cover. It's not air leak either, it's hard to explain. I would say, that the noise is coming from timing gears, at least i'm hearing it from timing gear cover. Maybe this noise is normal on this engine, i don't know. The owner is convincing me, that this sound is normal, but if you stand in front of engine with engine cover open and a little higher rpms, you get deaf.
     
  6. Aleš Tomažič

    Aleš Tomažič Member

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    And thats the machine:

    [​IMG]
    [​IMG]
    [​IMG]
     
  7. DEMLONE70

    DEMLONE70 Senior Member

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    Engine is 3054 Percat
     
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  8. Aleš Tomažič

    Aleš Tomažič Member

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    Hi DEMLONE70, so the owner didn't inform me with true engine type o_O. Do you know this engines?
     
  9. DEMLONE70

    DEMLONE70 Senior Member

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    Hi do u have a serial number ?
     
  10. mekanik

    mekanik Senior Member

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    Take the oil filter off and cut it open with a tube cutter if possible. curt a piece of the filter
    paper out about 3" long and the same width as your vice keep track of which side of the
    paper is the outside. squish the oil out of the paper with the vice and dry the paper with a rag.
    when you release the pressure from the vice the paper will dry up and you can see if there is
    any metal in it.
     
    Aleš Tomažič likes this.
  11. Aleš Tomažič

    Aleš Tomažič Member

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    I don't have serial number yet, will try to phone the owner and ask for it.

    Hi mekanik, thats a good idea, will try to suggest to the owner.
     
  12. Aleš Tomažič

    Aleš Tomažič Member

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    That's the sound i'm hearing on this excavator. From 13 second of video. Is this normal?
     
  13. mekanik

    mekanik Senior Member

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    Is this the 4.4 that is built by Perkins for Caterpillar?
     
  14. DEMLONE70

    DEMLONE70 Senior Member

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    Caterpillar owns Perkins
     
  15. Aleš Tomažič

    Aleš Tomažič Member

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    Now i don't know any more what engine is in this machine, c4.4 or 3054.
    Here i have some images of engine:

    [​IMG]
    [​IMG]
    [​IMG]
     
  16. DEMLONE70

    DEMLONE70 Senior Member

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  17. Tommy Bondo

    Tommy Bondo Member

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    Kinda like could you hold the phone a little closer to the engine. I can't hear it from here. In my experience that's a good little engine so without seeing and hearing it in person I wouldn't venture a guess. Be a great service/side gig to provide to prospective buyers for a tractor mechanic if you think about it.
     
  18. Aleš Tomažič

    Aleš Tomažič Member

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    Hi Tommy Bondo, that on YouTube is not engine from this machine. I just look for similar sound on YouTube with similar machine. Tomorrow I will ask experiened excavator mechanic if he will have time to have a look at the engine.