Hey guys, I bought a 97 Sea Ray with a 5.7L Mercruiser a few weeks ago as a project. Previous owner did not winterize the boat and cracked the block and one of the heads so I bought a long block to replace the motor. Previous motor had a serial number of K193942. Finished reassembling the new motor last weekend and was able to drop it in the boat. After finishing all the hookups i was able to fire it up and set the base timing to 10* BTDC and rechecked the initial carb settings so that it idles at 650 rpm. Ignition is a TB 5 without the knock sensor. It seems to idle a little rough and seems to have a few misses, I plan on rebuilding the carb. Upon acceleration I start to hear some knocking and it continues to get worse the faster it goes. I figured some lifters prolly needed to be adjusted so I was able to adjust them all to 1 turn past zero lash per the procedure in the service manual. This motor is an 87-95 roller btw with an 808 block and non Gen+ heads. I then put the covers back on and tried accelerating again, but am still getting the same noise. I have tried moving the distributor a little to see if that helped in case the timing was advanced too far which did not help. All the spark plugs are new delcos and were gapped to .035", cap and rotor have also both been replaced. I tried pulling one plug at a time to see if i could identify a cylinder and could not. I have also checked the compression and verified there is not any water getting into any of the cylinders in case there was an internal crack in the manifolds I couldn't see. All cylinders were right around 160. This motor has obviously not been broken in yet and I am afraid to take it out on the lake with it sounding like this to do so. This is my first experience with a long block so i am unsure of what it should sound like before it is broken in. I have posted a link below to a video i just shot to give you guys a better idea of what it sounds like. I'm hoping i don't have to pull it again and take it back. Any and all ideas/help is greatly appreciated! Thanks!
https://www.dropbox.com/s/6mf9z07ydd2feeb/IMG_2785.MOV?dl=0
