Angle for MMO soak - PeachParts Mercedes-Benz Forum

ah-kay · #9 01-25-2015, 11:15 AM

Quote:

Originally Posted by dieselbenz1

Ok last year when I checked cold compression I had only 260 psi in number 5. Since I am planning a vacation I was thinking of soaking number 5 in MMO. Without removing the valve cover I can find TDC and since the firing order is 1,2,4,5,3 5 should be at the bottom of its stroke at 36 degrees. So then just fill it up through the injector nozzle and wait 2 months!

Better yet would anyone know what position is best to fill all the cylinders? May as well do them all I guess. Should I be putting in known volumes of MMO?

260psi cold is a GOOD number. Minimum spec is 18bar ( approx 261psi ) hot so it will be within spec when hot. MMO does NOT work unless the coking is very light. BTDT. I took an OM603 cylinder out with stuck rings and soaked it in MMO for a week, nothing. Soaked in solvent, surface coking dissolved, basically nothing. Need to break the ring loose with slight hammering and scraped the coking out by hand. Even this was a lot of hard work. This piston may be the extreme but I do not think MMO works magic as most members believe.