No, in the morning on a cold start the tensioner works. It is after the motor gets hot that the tensioner gets stuck. We think its shaft is just milled too close to the cylinder bore. He thinks it might wear in. If not we will replace it.
Ok
I understand his what he thinks is occurring. I don't understand how sticking when hot would cause problems. The tensioner is already expanded when it occurs. It would have to lose oil pressure to the tensioner, lose the tension on the chain and then stick in the lower tension position.
Unless this occurs after a hot restart, I just don't see his explanation being the reason. I could see the tensioner losing oil pressure after a hot shut-down and sticking when pressure is reapplied on start. It's not good if this occurs on a quick hot restart. This means the tensioner is losing oil pressure too soon. The tensioner should retain oil pressure for quite a while. Otherwise, it would rattle on every start.
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