Motor problems with a Sharan 1.9 TDI 110 hp

Hello everyone,
I've been having a problem with my Sharan's engine for some time now. The engine has 186,000 km on it, and the timing belt was replaced by an independent mechanic at 180,000 km.
switched the spring roller and idler roller. Now I have the problem that, when the engine has been running for a while, either the hydrauliсs or the valves themselves start to rattle.
In addition, there's a dull thudding sound coming from the air filter box, which is concerning me.
I personally removed the cylinder head cover to examine the camshaft and the hydraulic lifters. While the camshaft itself didn't seem to have any particular issues, when I tried to push the lifters in with a piece of wood, I noticed that the lifter on the very left side (when standing in front of the car) was actually quite easy to move (even with my finger). All other hydros are also difficult to move, requiring a significant amount of effort.

My questions:

1) Can the problems described above be caused by this single hydraulic valve?

2) Could it be that something went wrong during the timing belt replacement, and as a result, the cam shaft was damaged?

3) Can I check myself to see if the timing is correct?

Thank you for every helpful comment.

Can the problems described above be caused by a single hydraulic valve?


Yes, because the valve then doesn't open correctly;

Could it be that something went wrong during the timing belt replacement, which resulted in the cam being damaged?

More unlikely... how so?




I can check myself to see if the timing is correct.


The camshaft position by finding the marking on the crankshaft, and then, after removing the valve cover, check if a camshaft alignment tool would fit (if necessary). Rotate the crankshaft one more revolution, and then check again).

The TDI pump with the TDI graph that should be included with VAG COM;


By the way: in your case, the search function would have been very helpful

Hello,
I've been searching through the forum for several days and have found a lot of information using the search function, but I haven't found a similar problem to mine.
The problem is that the engine runs normally when it is cold, but then starts to knock when it is in operation. This also causes a dull knocking sound from the area of the air filter housing.

Best regards
Alfi28

When was the last oil change?
'Used' oil can cause the engine to make all sorts of noises...