Hello, I was wondering if the tab on the large chain guide that the chain tensioner rests on is supposed to rotate? Mine seems to have a wear spot on it from the tensioner pressing against it and upon reassembly I have noticed that the little tit on the chain guide rotates. Is it supposed to rotate or did I do something to it when we took the head off? Trying to figure out how it could be worn in one spot if it is supposed to rotate.

If it has worn on that bit I guess the other side where the chain makes contact is worn too. I'd replace the whole guide rail if I were you.

You know about filling the tensioner with oil before installing don't you?

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1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone

Don't leave that there - I'll take it to bits!

Hello, Army...top- o the morning. I think the chain side is in great shape actually. No I did not know about filling the tensioner with oil. I was wondering about taking that thing apart to clean it but am not sure how. I got a new timing chain tensioner spring. I think unless it is absolutely necessary I will have to stick with this guide rail, I have gone way over budget to this point. Maybe I will do it down the road when the timing chain gets done. I do have the new lower guides for that so far, just need to save up for a chain and upper large guide.

Everyone should know the pin that goes through the block to hold the timing guide in the cyl. head is $65.00 and as far ass I can tell is dealer only. All the parts sites list the part but nobody has them. I was going to buy a new one but when I heard the price decided to stick with the old one. The dealership prices for parts are getting crazy lately. I can see this hobby ending soon if these prices stay like this..