Well, my thought is that you did the installation correctly.

The tensioner on the 240D engine is not a ratcheting device. The tension is just a matter of spring pressure and oil pressure. The oil pressure actually provides the stronger tension - with the spring being there to keep a minimum of pressure against the chain during the startup situation.

So, there's no reason that I know of to take off the bolt when installing a new tensioner. The bolt is there so you can check and change the spring, since over time the spring can get weak.

You should be in good shape.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles