Hello All,
I was able to get my 18.5 glastron out over the weekend and do some water testing. The boat suffered from a low rpm vibration or miss on muffs and did the same on the water.
I have done a complete tune up including setting dwell (32) and timing after, (6 degrees BTDC).
The boat will start on the first turn of the key. The vibration is present until about 1500 rpm then it smooths out and runs very well. Max RPM at WOT is about 4200. Boat speed is just under 40 MPH.
After this vibration annoying me enough I did a compresion test;
1. 125
2. 110
3. 140
4. 140
5. 140
6. 140
In doing the compression test with the boat in the water, I noticed a fine mist of water coming out of #2 cylinder. The plug from #1 and #2 looked a little different from the others.
I also noticed a small water leak (very small drip) coming from the connection of the exhaust elbow (metal) to the rubber tube that goes straight down and out the boat.
Where do I start in the process of finding why the water is getting into the cylinder?
Does the leak in the exhaust elbow have anything to do with it?
The boat had not been run and was in outside storage for 3 years prior to me doing all this. It is a 1976 with about 650 original hours on it.
Thank you in advance,
Jim
I was able to get my 18.5 glastron out over the weekend and do some water testing. The boat suffered from a low rpm vibration or miss on muffs and did the same on the water.
I have done a complete tune up including setting dwell (32) and timing after, (6 degrees BTDC).
The boat will start on the first turn of the key. The vibration is present until about 1500 rpm then it smooths out and runs very well. Max RPM at WOT is about 4200. Boat speed is just under 40 MPH.
After this vibration annoying me enough I did a compresion test;
1. 125
2. 110
3. 140
4. 140
5. 140
6. 140
In doing the compression test with the boat in the water, I noticed a fine mist of water coming out of #2 cylinder. The plug from #1 and #2 looked a little different from the others.
I also noticed a small water leak (very small drip) coming from the connection of the exhaust elbow (metal) to the rubber tube that goes straight down and out the boat.
Where do I start in the process of finding why the water is getting into the cylinder?
Does the leak in the exhaust elbow have anything to do with it?
The boat had not been run and was in outside storage for 3 years prior to me doing all this. It is a 1976 with about 650 original hours on it.
Thank you in advance,
Jim