dozerII
Admiral
- Joined
- Oct 25, 2009
- Messages
- 6,527
1981 Mercruiser 140, ser #5962858 I has another thread were I asked for info on the exhaust elbow, I ended up replacing both the elbow and the manifold, as well as the shutters. I did a carb rebuild, plugs, points, rotor, cap, wires. The previously cracked elbow had allowed some water to get into mostly #3&4 cylinders with out any rust forming on the cylinders from what I could see in the video from my bore scope, there is also an old previously welded crack in the block, just below the head on the port side. Today I fired her up and ran it for 30 minutes, to check for water leakage from the weld and possibly into the oil, neither showed any signs of water. After I shut it down I did a compression and leak down test, the results are as follows.
#1 120 #2 125 #3 105 # 118
Leak down was as follows
#1 17% could only hear a very faint leak from the vent in the valve cover.
#2 28% Slightly more of a leak in the vent in the valve cover.
#3 38% quite bad from the valve cover
#4 38% quite bad from the valve cover
Video of the motor running,
Opinions?
#1 120 #2 125 #3 105 # 118
Leak down was as follows
#1 17% could only hear a very faint leak from the vent in the valve cover.
#2 28% Slightly more of a leak in the vent in the valve cover.
#3 38% quite bad from the valve cover
#4 38% quite bad from the valve cover
Video of the motor running,
Opinions?