I have been reading this forum substantially and read a wealth of knowledge pertaining to my engine and previous issues previous people have had, unfortunately I still can't figure out what is going on with this engine.
The engine is Model 150 GLEIS bought in March 2019 (new to me).
Boat from March to June was running OK, often sneezing out the exhaust and would shut down at idle but would quickly restart. This I figured was due to the fact that the boat had not had any service done to it for quite some time. So I performed the following
Bought OMC service manual
Replaced spark plugs with factory recommended plugs
Rebuilt all six carbs
Replaced cracked fitting on primer solenoid (the red valve was cracked and spewing gas when key pushed in)
Replaced gasket for vapor separator (I could see a gas leak in there when ball was pumped)
Performed a link and sync, replaced a missing sleeve on cam next to throttle
Changed water pump and new lower unit lube (don't think that would do anything?)
Boat started first crank on muffs, I thought I had fixed the sneeze. Boat is kept in slip so I put boat in water, as soon as it was in water it started sneezing as usual, not much really changed. Brought the boat to the slip and over the last week has gotten so bad engine will not start until after two minutes of cranking. I can keep engine going at about 1500 rpm but anything below that and it dies. Previously engine was running strong, great top end and WOT lots of power.
Here is what I know:
- engine is hard to start while tilted and easier to start when level
- sometimes it appears to run better with primer solenoid set to PRIME position
- When engine sneezes and dies, I can visible see the gas line on the right side running from vapor separator to right bank move back and forth as if under some type of pressure. I can not feel or see a sneeze come out of the carburetors but I can hear and almost see a sneeze come out of the exhaust.
-Some of the gaskets around the fuel bowls appear wet when I pump the ball, as if the gaskets could possibly be leaking or fuel bowls warped?
-On the top left carb, if I pump the ball fuel spills out into the air silencer, if I leave the solenoid primer on the "prime" position on the top left fuel spills out continuously into the air silencer.
I bought a compression tester today fearing the worse as I was pretty sure engine was cooked # in Lbs/ft: 94 95 98 85 91 91. The 85lbs is troubling me, I tested it twice (keep mind I can not warm up engine at this point it will not start so maybe not the most accurate readings)
I also used an inline spark tester to at least see if there was power going to each plug and there was.
I took the fuel hose off from the vapor separator to the right bank so I can visible see fuel being pumped, looked ok
I am at a loss! Any thoughts on what to do next? I have the OMC manual and been trying to follow everything by the book.
The engine is Model 150 GLEIS bought in March 2019 (new to me).
Boat from March to June was running OK, often sneezing out the exhaust and would shut down at idle but would quickly restart. This I figured was due to the fact that the boat had not had any service done to it for quite some time. So I performed the following
Bought OMC service manual
Replaced spark plugs with factory recommended plugs
Rebuilt all six carbs
Replaced cracked fitting on primer solenoid (the red valve was cracked and spewing gas when key pushed in)
Replaced gasket for vapor separator (I could see a gas leak in there when ball was pumped)
Performed a link and sync, replaced a missing sleeve on cam next to throttle
Changed water pump and new lower unit lube (don't think that would do anything?)
Boat started first crank on muffs, I thought I had fixed the sneeze. Boat is kept in slip so I put boat in water, as soon as it was in water it started sneezing as usual, not much really changed. Brought the boat to the slip and over the last week has gotten so bad engine will not start until after two minutes of cranking. I can keep engine going at about 1500 rpm but anything below that and it dies. Previously engine was running strong, great top end and WOT lots of power.
Here is what I know:
- engine is hard to start while tilted and easier to start when level
- sometimes it appears to run better with primer solenoid set to PRIME position
- When engine sneezes and dies, I can visible see the gas line on the right side running from vapor separator to right bank move back and forth as if under some type of pressure. I can not feel or see a sneeze come out of the carburetors but I can hear and almost see a sneeze come out of the exhaust.
-Some of the gaskets around the fuel bowls appear wet when I pump the ball, as if the gaskets could possibly be leaking or fuel bowls warped?
-On the top left carb, if I pump the ball fuel spills out into the air silencer, if I leave the solenoid primer on the "prime" position on the top left fuel spills out continuously into the air silencer.
I bought a compression tester today fearing the worse as I was pretty sure engine was cooked # in Lbs/ft: 94 95 98 85 91 91. The 85lbs is troubling me, I tested it twice (keep mind I can not warm up engine at this point it will not start so maybe not the most accurate readings)
I also used an inline spark tester to at least see if there was power going to each plug and there was.
I took the fuel hose off from the vapor separator to the right bank so I can visible see fuel being pumped, looked ok
I am at a loss! Any thoughts on what to do next? I have the OMC manual and been trying to follow everything by the book.