Hello,<br /><br />I have an old Merc 500 '72 4 Cyl. Thunderbolt Type II Ignition.<br />Now i get another one with Type IV Ignition, which i want to put on my motor. (same Powerhead etc...).<br /><br />I would also like to have a look at the Powerhead and do a big overhaul. BUT, when i look at the prices for all the gaskets and bearings i would have to change according to the Seloc Manual, i could get a complete used engine. Also, the Seloc manual says i have to disassemble the whole thing including pistons and rods, but on the other side, they write NEVER use a 3 ring piston after removing from the rod. Another 500$ if i really need to buy new pistons and rings. Now i wonder if i just should repair/upgrade the electric part and let the rest as is...<br />Anything i should look at before the first start? The motor was "dry" for some time. <br /><br />many thanks<br />martin
<br /><br />Well, i am not really sure if my motor needs to be disassembled completely. When i turn it on the flywheel very slowly (sparkplugs removed) i do not hear anything. BUT when i move it a bit faster, there is some kind of squeezing noise. Sounds strange. I don't know if it is a bearing or just some air going through somewhere. If it is a rod or crankcase bearing i think restoration gets really expensive...<br />The motor stood around for qutie a while, i just sprayed oil into the holes of the sparkplugs and tried to spray it through the carburetor assembly to get it to the crankcase. Don't know how to explain it better, hope you understand what i mean. 