I removed my oil fill cap and shown a flashlight down inside. I could see the timing chain tensioner pushing against the timing chain tensioner rail. It just looks like a bolt pressing against the plastic rail. You should be able to see the same thing.
Now, you can idle the engine with the oil fill cap off, but oil splashes out and makes a mess. Regardless, perhaps you could run it for a few seconds and see if the timing chain looks loose. Just keep some rags laid around the oil fill hole when the cap is off so that you can clean up the mess.
2008 WK "S" Limited bright metallic silver exterior, light graystone interior, 5 speed W5J400 transmission, June 18/2008 build, C213RE rear differential with 3.73 axle ratio, C200FE front differential with 3.73 axle ratio, 245/60R18 Goodyear Fortera tires (stock summer tires), NV245 transfer case, GT2056V turbo, 3.0L CRD (OM642.980)