Hell all, I recently purchased a project 2014 155 s 165 hours. Yes i know a pain to work on but lucky me all bolts came off without snapping and i got to the engine bay. I was told that this ski overheated .. i looks on the history with CanDoo and i saw maximum coolant temperature 136 degrees celsius. The running rpm history show the ski was not beaten most of it is under 5000 rpm.
The ski starts easy (i only tested it outside of the water) but hesitates when i give it a brief acceleration ...
I did a compression test with a compression tool and i got 95 , 95 and 120 psi. I don't know how accurate my tool is that seems like a low compression. There is no oil in the water and no milky oil. For the 2 cylinders that had low numbers i poured a teaspoon of oil in the cylinder and redid the test and i got the same numbers so it does not look like the rings are faulty.
Pulled the oil filter absoluteness no metal flakes. Oil looks clean. Extracted the oil and i let it sit, no water in oil.
I then removed the engine, removed the rocker arm and did a leak down test. With 90 psi on the tool I got under 10% leak on cylinder 1 (the one with 120 psi) and under 20% on the other two. The air was manly escaping on the exhaust port. The fact that the engine is out (so no more coolant in the engine to watch for bubbles) and the air coming from the exhaust how can i diagnose if my head gasket is blown?
The ski did not run for the past 2 years (i see the last tag 2023 on it) I suppose the exhaust valves might be a bit rusty; running the engine it might reseat them, right ?
According to the manual under 20% i am within specs .. .but then why the low compression ?
All of my test were done with the engine being cold.
Now the compression test low numbers contradict the leaks down test that show the engine is within specs. What do you suggest the next step is? Should i pull the head and replace the head gasket ? What else would you do ?
Thank you
The ski starts easy (i only tested it outside of the water) but hesitates when i give it a brief acceleration ...
I did a compression test with a compression tool and i got 95 , 95 and 120 psi. I don't know how accurate my tool is that seems like a low compression. There is no oil in the water and no milky oil. For the 2 cylinders that had low numbers i poured a teaspoon of oil in the cylinder and redid the test and i got the same numbers so it does not look like the rings are faulty.
Pulled the oil filter absoluteness no metal flakes. Oil looks clean. Extracted the oil and i let it sit, no water in oil.
I then removed the engine, removed the rocker arm and did a leak down test. With 90 psi on the tool I got under 10% leak on cylinder 1 (the one with 120 psi) and under 20% on the other two. The air was manly escaping on the exhaust port. The fact that the engine is out (so no more coolant in the engine to watch for bubbles) and the air coming from the exhaust how can i diagnose if my head gasket is blown?
The ski did not run for the past 2 years (i see the last tag 2023 on it) I suppose the exhaust valves might be a bit rusty; running the engine it might reseat them, right ?
According to the manual under 20% i am within specs .. .but then why the low compression ?
All of my test were done with the engine being cold.
Now the compression test low numbers contradict the leaks down test that show the engine is within specs. What do you suggest the next step is? Should i pull the head and replace the head gasket ? What else would you do ?
Thank you
