[NMKawierider]

OK, do you know why tensioner head has broke?

I wouldn't know...I didn't assemble it. Probably over-tightened.

[doug80638]

Let's not get ahead of ourselves.  There is evidence of a leak, and a small one at that. There is no evidence that the tensioner is broken.

Clark's picture is of one type of tensioner, but not the type pictured on the engine.

There should be a cap on the top of the tensioner  (not unlike a bearing cap) that covers the exposed tension adjustment screw, and that appears to be missing in the picture. The manual lists this cap as a gasket, so I suspect its job is to prevent any oil leaking.

If you are concerned about the tensioner failing, then remove the valve cover and check the chain tension. It's probably fine.

I would clean the engine and then run it, looking for fresh oil to identify where the oil is coming from.

If the oil is indeed coming from the tensioner, you may need to buy a new one, as I rather doubt the cap is available individually.

The manual indicates that they are easy to install. Basically set the tensioner before installation by turning the adjusting screw full clockwise. Bolt the tensioner to the engine (10n/m) and then turn the tension screw counter-clockwise. There is a comment that the tension screw be set to 8n/m (about 70 inch pounds). Then install the cap.

If it were my machine, and the chain tension is fine, and the oil was coming from the top of the tensioner, I'd be tempted first to clean the top of the tensioner and cover it with silicon gasket goop or put some other form of cap (rubber hose?) on it and move on. Or, you could by a new tensioner, put the new cap on the old tensioner and save the new tensioner as a spare.

[Kuco]

I have already order a new tensioner, and i will replace the old one, that is the easyest way. The engine runs normaly

[Skogsvarelse]

you are youst missing the screw that are soposed to sitt in the hole to keep it from spraying out oil.

When my dealer repleced my cam shain tensioner (it had broke and you could hear that wery well from all the metal cluking sounds at idle) and the missed to put that screw in, and i didn't realiced it was missing for a while. Startet to investigate where all the thin layer of oil where comming from  after a couple of mounths. Put in new screw in and no problem.   

the thing it the tensioner you can screw on are to lock it in place when it's removed in some way. If im not remeber it wrong the tensioner are spring loaded  and not adjusteble.

Whats happening when the tensioner is missing the screw it "works" like a second crank case ventilation

[Kuco]

This is how looks new tensioner, I unscrew the old one but I can not remove him, I dont know why

[NMKawierider]

That new one doesn't look much different then the old one. Are you sure that's the leak is? Do you have a service manual for this machine?

If not, here. This will help you. Download it within 72 hours:

https://documentcloud.adobe.com/link/track?uri=urn%3Aaaid%3Ascds%3AUS%3A098771f8-4710-45d7-b59c-fc29ff1a2fcb

[Kuco]

They look the same. I missing the screw on the old one, can I put screw like this on the old one and tight well?

[Skogsvarelse]

The original screw is quite short. I took an m6 bolt with 10or8mm head (can't remember any of them) and cut it so it did get short and tighten it. You have an O-ring (rubber "seal") on the screw, the screw head is soposed to tighten to keep it sealed. 

If you look in the image i attached to the post you can see what i mean with the head sealing to the o-ring

[Skogsvarelse]

this is from an manual (it can be diffrernt depending on model year of your machine but it possible you have to turn the inside so you look the spring in place to remove it