Engine Knocking...

Discussion in 'Mech Tech' started by SeanOC, Sep 5, 2020.

  1. Hi
    Just back to near London from the Lakes and I have a horrible feeling that I have a pronounced engine knocking

    The valves often rattle but I think this is something knocking to the left of the engine as you look into the engine bay on a T4 2Lit engine

    Ideas on how to identify the cause please?

    I tried to post a video but that doesn’t appear to be an option on the forum


    Sent from my iPhone using Tapatalk
     
  2. Zed

    Zed Gradually getting grumpier

    You need to host the video elsewhere for example youtube.

    Meanwhile you could get a 1/2" dowel or square or practically anything, long enough to keep you clear of moving parts and hot exhausts - 18" perhaps - use against your skull near your ear or however is most comfortable. Press the other end on the block, the heads, the oil pump etc.

    If you shut your eyes it's like being inside the engine. :)
     
    PanZer, DubCat, zv6883 and 1 other person like this.
  3. Pop the vid on utube then paste the link onto here.
    It’s always difficult identifying noises on an air cooled engine particularly a type 4 as they are generally noisy anyway. However a keen ear can identify a new noise.
     
  4. Hydrolics or solid lifters .?
     
  5. Cheers Zedders.
    Just worked out how to post via YouTube:
     
  6. Bugger ...


    Sent from my SM-G960F using Tapatalk
     
  7. Solid lifters
     
  8. Exactly, I'm sure it's new n doesnt sound good... :(
     
  9. Zed

    Zed Gradually getting grumpier

    It's running smoothly.
    The fan is very straight.
    Any other symptoms?
     
    pkrboo and SeanOC like this.
  10. MorkC68

    MorkC68 Administrator

    is it a mechanical knocking, I could here the "phut phut" kinda sound a type 4 makes when idling but I couldn't here a knocking noise.
     
  11. I have an idea that there is a distinct knocking sound but I don’t think it’s coming out on that video


    Sent from my iPhone using Tapatalk
     
  12. Zed

    Zed Gradually getting grumpier

    Oh it's coming out loud and clear! I thought that was beyond discussion.
    Was it worse under load?
    If you gently revved it does it cycle louder or quieter.
    Or it it there all the time no matter what, faster with revs
    Or did it backfire in any cicumstances on it's last journey or lack power or....

    That sort of thing helps narrow it down. :thumbsup:
     
    PanZer and SeanOC like this.
  13. Zed

    Zed Gradually getting grumpier

    Here's mine on a bad day, I'm looking for a ticking.

     
    Pedro del monkeybike and SeanOC like this.
  14. Your problem is easy to identify. There’s clearly a small dog trapped in there. If you listen carefully you can hear it barking.
     
  15. Have you checked the valve clearances?
     
    dubsurftones and SeanOC like this.
  16. Have you had a look at some other type 4 engine noise videos on utube? There are quite a few, one which has a big end knock. However i am not convinced you’re noise is deep enough to be big end. Does it get a lot louder when you rev it?
    First thing I would do is whip the rocker covers off & check the valve clearances.
     
    SeanOC, F_Pantos and Zed like this.
  17. Dubs

    Dubs Sponsor supporter extraordinaire

    Sounds valvey / tappety to me.. whip the rocker covers off and have a butchers.
     
    SeanOC likes this.
  18. I will have a play tomorrow.
    Otherwise I’m going to Techenders next week so we can have a listen then if that’s ok?


    Sent from my iPad using Tapatalk
     
  19. Zed

    Zed Gradually getting grumpier

    I wouldn't drive it making that noise personally. As Dub says, have a look in the valve cover on the side you suspect.
     
    Last edited: Sep 6, 2020
    PanZer and paulcalf like this.
  20. Will do, that’s kinda answered my next question


    Sent from my iPad using Tapatalk
     
    Lasty likes this.

Share This Page