Hello Together would like to introduce me briefly. My is Peter and I actually come out of the boat forum. There, however, I can not really help with my problem. In my boat I have built an old GM 6 cylinder Inline 4.2 liter, 165 Ps. I bought the engine with bearing damage and repaired it again. Now I have the following problem. 1. Oil pressure in idle (700 rpm) changes between 1 and 2 bar. at 4000 rpm max 3 bar. I have 1 bar in idle, then I like r 2 bar. is that actually ok ? 2. In idle one hears a quiet tackern in the area of the 6 cylinder, but only if oil pressure has 1 bar. If oil pressure in idle run higher then tacker away. This tackern has been there from the beginning, but never noticed (already listen to video of trial run). After about 30 hours of boat operation it has occurred to us with open engine cover. Does anyone have an idea what that could be ? warm greetings Peter