getinmerry
Petty Officer 1st Class
- Joined
- Jul 17, 2007
- Messages
- 211
Was out with the family the other day enjoying the nice weather. Had driven the boat about 20 miles without even a misfire. Returning to the launch (at about 25mph @ 3200 rpm- nowhere near WOT), all of a sudden the engine started to diesel (rattling sound like bad gas), and it started to feel like I was dragging a skier behind me. In the seconds it took for me to process that there was a problem and reach for the throttle, there was a loud "POP" and another new sound developed. I shut right down and ran to the back to check things out.
There was no water in the oil. The oil still looks new. No water in the bilge.
I restarted the motor. I could clearly hear the compression was escaping on a cylinder. I suspected that I blew an insulator out of a plug, but alas, I wasn't that lucky. The motor was running smoothly at idle except for the pop-pop-pop of the compression leak. No more dieseling or rattling.
I was able to limp the 5 miles back to the launch and get back on the trailer without incident. I did stop frequently to check the oil for water, but all was good.
I haven't torn the motor down yet, but here's the information that is needed by everyone to hopefully give me a hand:
2007 Glastron GT 185
3.0 Volvo Penta motor and outdrive
125 total hours on boat and motor
Fully maintained by the dealer and myself.
Never overheated-yes I'm sure
Oil pressure and water temp were both good at the time of detonation.
Plug color white/gray on all 4 cylinders
#1 cylinder 120lbs compression all others 155-160.
Puffing (popping) noise clearly coming from under manifold by cylinder #1.
Removed valve cover- all valves appear to be operating normal (no damage seen as of yet).
Fresh fuel was being used with 89 octane.
Here's the question I need a hand with:
When this boat was new with less than an hour on it, it died and would not restart. The distributor was replaced along with the ignition module, and has been fine since. In doing some research, I read that out of whack timing can blow head gaskets and I am suspecting that right before it went boom, the timing went out of whack because of the dieseling I heard and the loss of power. Am I way off in thinking the module took a crap? The motor has never been abused, it's been flawless all season, It just doesn't make any sense. Please help me figure out the cause because I don't want to fix it and have it happen again.
Thanks in advance!
Chuck
There was no water in the oil. The oil still looks new. No water in the bilge.
I restarted the motor. I could clearly hear the compression was escaping on a cylinder. I suspected that I blew an insulator out of a plug, but alas, I wasn't that lucky. The motor was running smoothly at idle except for the pop-pop-pop of the compression leak. No more dieseling or rattling.
I was able to limp the 5 miles back to the launch and get back on the trailer without incident. I did stop frequently to check the oil for water, but all was good.
I haven't torn the motor down yet, but here's the information that is needed by everyone to hopefully give me a hand:
2007 Glastron GT 185
3.0 Volvo Penta motor and outdrive
125 total hours on boat and motor
Fully maintained by the dealer and myself.
Never overheated-yes I'm sure
Oil pressure and water temp were both good at the time of detonation.
Plug color white/gray on all 4 cylinders
#1 cylinder 120lbs compression all others 155-160.
Puffing (popping) noise clearly coming from under manifold by cylinder #1.
Removed valve cover- all valves appear to be operating normal (no damage seen as of yet).
Fresh fuel was being used with 89 octane.
Here's the question I need a hand with:
When this boat was new with less than an hour on it, it died and would not restart. The distributor was replaced along with the ignition module, and has been fine since. In doing some research, I read that out of whack timing can blow head gaskets and I am suspecting that right before it went boom, the timing went out of whack because of the dieseling I heard and the loss of power. Am I way off in thinking the module took a crap? The motor has never been abused, it's been flawless all season, It just doesn't make any sense. Please help me figure out the cause because I don't want to fix it and have it happen again.
Thanks in advance!
Chuck
