When my 87 Merc 170 engine is running, I hear a very slight knocking sound and I am not sure what it is. Since I am not really a mechanic, this may be normal, but I am thinking not. This happens at both idle and when the engine is revved, and the knocking will change with the engine speed. There doesn't seem to be any ill effect from the noise, but now I am curious.
I have read some posts that say this could be from air under the lifters, but I would need more details on this.
I realize that this is very littel information, possibly too little to go on, but is there anyone brave enough to offer some advise on where to look next?
Much appreciated!
I have read some posts that say this could be from air under the lifters, but I would need more details on this.
I realize that this is very littel information, possibly too little to go on, but is there anyone brave enough to offer some advise on where to look next?
Much appreciated!