Quote:
Originally Posted by ArtMan
I have a favor to ask.....I am starting to think that the timing chain tensioner (7) and guide rail (5) are worn out or on their way. There is also a upper tensioner (2) in the right picture. Now when i put my hand on the front black part of the engine not where the oil top is but down basically right above the chain on the valve cover when i have someone rev the engine slowly building rpms i can feel the chain to what feels like its hitting the valve cover but i would like to know if any one who has experiance with this can pitch in and for those that dont have any sounds would mind feeling the valve cover and see if you feel the same thing. THANKS!!!
OEM / Performance Parts for Audi, BMW, Mercedes Benz, Mini, Porsche & Volkswagen - ECS Tuning |
When I had my 318 (M42 engine) it was the same setup as yours for the chain tensionner. On those engines, the hydraulic tensionner had a tendency to fail every 2 years, at least on my car.
It is item 9-10-11-12 on your diagram. For my 318, those parts were sold assembled, and called a hydraulic tensionner. It gets extended by oil pressure and pushes on the chain tensionner itself (ref #7). I don't know why for the X5 it comes as separate parts, but on my 318, the piston was easy to wear, and was then not pushing strong enough on the tensionner and you could hear rattles from the front of engine.
Maybe that is your problem. At least, it's a less expensive try than opening the front of the engine, and it takes 10min to change.
As a reference, here is the diagram for a 318. It is part #17
RealOEM.com * BMW E30 318is Timing and valve train-timing chain