Chasing Engine Tap

[kalikar85]

Chasing an engine tap.
Is this shoe tensioner supposed to look like this?


It sounds like the tap is coming from the middle of the head.


https://www.youtube.com/watch?v=GsWpVpcLDk4


1985 300CD-T W123.153 OM617.952 494 California Version

[Willroach]

Have you checked your motor mounts /shocks? The motor looks as if it is shaken excessively due worn mounts. The noise seemed sharper when you panned the camera under the car.

[EJHumber]

I would definitely change your motor mounts if you haven't done that yet. As far as the timing chain tensioner goes, that alignment of the guide rail and tensioner is normal.

[TnBob]

A valve adjustment would sure be in order too.

[funola]

In video, when engine was shut off there was a clunk that sounded like collapsed motor mounts. With engine running, jack the engine up from oil pan with thick rubber pieces (cut up old tire?) in between and see if thumping goes away. Shut engine off while jacked to see if that clunk goes away also. From your other thread, it sounds like you have more serious problem than just motor mounts. Did you use a stethoscope to localize where the thump is coming from? A wooden broom stick cut to length works well.

[Maxbumpo]

Originally Posted by kalikar85

Is this shoe tensioner supposed to look like this?

I don't think so, to me that is a good sign the banana rail is worn out. It is no longer holding its shape. My OM603 looked like that, when I had the head off I changed both the rail and the tensioner, and then the rail pin lined up properly.

[rscurtis]

Something has too much valve clearance, and a valve is not opening much. Note how the engine runs rougher as the speed in increased.

[kalikar85]

Originally Posted by rscurtis

Something has too much valve clearance, and a valve is not opening much.

Could you elaborate on that? Im not sure what your trying to say. You mean a valve is too loose? I performed a valve adjustment prior to shooting the video.

[rscurtis]

I would say a valve is too loose, probably an exhaust valve based on the shaking.

[kalikar85]

Originally Posted by Willroach

Have you checked your motor mounts /shocks? The motor looks as if it is shaken excessively due worn mounts. The noise seemed sharper when you panned the camera under the car.

Originally Posted by EJHumber

I would definitely change your motor mounts if you haven't done that yet. As far as the timing chain tensioner goes, that alignment of the guide rail and tensioner is normal.

Originally Posted by funola

In video, when engine was shut off there was a clunk that sounded like collapsed motor mounts. With engine running, jack the engine up from oil pan with thick rubber pieces (cut up old tire?) in between and see if thumping goes away. Shut engine off while jacked to see if that clunk goes away also. From your other thread, it sounds like you have more serious problem than just motor mounts. Did you use a stethoscope to localize where the thump is coming from? A wooden broom stick cut to length works well.

put in new motor mounts

Originally Posted by TnBob

A valve adjustment would sure be in order too.

Originally Posted by rscurtis

I would say a valve is too loose, probably an exhaust valve based on the shaking.

adjusted valves prior to this video (not ruling out they might be too loose)

cylinder 2 is not firing even after injector swap

[kalikar85]

compression on 2nd cylinder 290psi

will a loose valve cause a dead cylinder?

[DeliveryValve]

This is confusing, why do you have two threads going at the same time with the same topic?

As far as the rest of the cylinders, what are the other numbers?