Belt tensioner not stable

Hi everyone,
I just finished replacing the fan clutch bearing, belt tensioner and the radiator.
I started the engine and watched for licks and strange things and see the tensioner jumps every few sec for about 1 cm, it didnt roll constantlly in the same spot . Is it nornal? I didnt see it before but maybe i didnt look for it that carefully.
Thanks in advance

Engine clue please

J

Discovery 2 2004 td5

The tensioner on any engine will move about as the revs change, more as you rev it. As the crank snatches on the belt when a cylinder fires, the tension increases briefly.

So, when the engine is in low rpms the movment of the tensioner will be more pronounced?

I think i understood you.... as the rpm will increase the tensioner will feel more changes in the tension per sec but we will not see this as it get "stable" somewhere at the everage?

An engine doesn't turn idle perfectly smoothly so you'll see it tug on the belt and the tensioner will move, same if you blip the throttle

Hi, I put a Dayco belt/tensioner kit on mine & it did exactly the same,I even put the old bits back on because I presumed something was wrong but it was the same & like you put it down to 'I didn't notice it before'. I've since replaced the alternator with a new Hella unit & the tensioner still jumps about. It's done about 4,000 miles without issue.

Is makes me happy to ear that it is probably o.k. tommorow i will add ashort video just to make sure.
Thanks alot friends

Most engines with auto tensioners jump about quite a bit

Sorry a bout the quallity of the film
https://youtube.com/shorts/G6Yos4Gv__4?feature=share

Looks good to me

Thanu u

Menash said:

Sorry a bout the quallity of the film
https://youtube.com/shorts/G6Yos4Gv__4?feature=share

Click to expand...

Same as mine!

Menash said:

Sorry a bout the quallity of the film
https://youtube.com/shorts/G6Yos4Gv__4?feature=share

Click to expand...

Yep normal.

Thank u all