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
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.
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.
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.
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
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.
Your problem is easy to identify. There’s clearly a small dog trapped in there. If you listen carefully you can hear it barking.
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.
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
I wouldn't drive it making that noise personally. As Dub says, have a look in the valve cover on the side you suspect.