Volvo Penta Water in pistons

Juiced06GTO · 08-03-2021, 08:17 PM

Bad riser gasket then maybe, or just bad design allowing reversion up through the manifold when slowing down?

I've never had a closed cooling marine engine apart so wasn't sure what they did with the heat exchanger water.

Dave R · 08-10-2021, 09:09 AM

VP used to use exhaust flappers/water shutters in the exhaust system just downstream of where the cooling water mixes in with the exhaust gases. For some reason they stopped about 20 years ago. They were there to prevent water from coming up into the exhaust when the boat decelerates rapidly.

I would guess that your engine is a bit too low relative to the water line of the boat and water can make its way up too easily. Risers between the manifolds and elbows were a common fix for this, but some new exhaust designs don't allow for this because the manifolds and risers are one piece. I'm not sure what can be done for your boat, but you should never ever pull the throttle lever to idle while on plane, always slow down gradually unless there's an emergency.

Your starter (likely a Delco PG260M) has a planetary reduction gear set with a plastic ring gear that will fail if the engine is hydro-locked. You can usually just replace the $10 gear https://www.walmart.com/ip/New-Gear-Stationary-for-Delco-PG260M-Series-PMGR-Starters/824445923?wmlspartner=wlpa&selectedSellerId=101001368&&adid=22222222227257783475&wl0=&wl1=g&wl2=c&wl3=307316312058&wl4=aud-1308652556816

la-551611137986&wl5=9002460&wl6=&wl7=&wl8=&wl9=pla&wl10=127117920&wl11=online&wl12=824445923&veh=sem&gclid=CjwKCAjwx8iIBhBwEiwA2quaq4hRxy-Yb_YhWfZfFOVmzNYOe-RPf3DyQXYLHmkTfiFvZ6HaymQrsxoCueoQAvD_BwE&gclsrc=aw.ds to fix the starter.

Nololoco · 02-20-2022, 04:41 PM

Maddie. Did you figure out where the water was coming from?

Maddie · 02-27-2022, 02:14 PM

No. Volvo had no idea and neither did the marina service. They replaced a bunch of parts after being pulling the engine and the boat being out of service for 6 weeks in the middle of the Summer. When I finally got the boat back I put about 10 hours on the motor without any issues.

08-10-2021, 09:09 AM	#2
Dave R Senior Member Join Date: Jul 2004 Posts: 2,985 Thanks: 246 Thanked 744 Times in 444 Posts	VP used to use exhaust flappers/water shutters in the exhaust system just downstream of where the cooling water mixes in with the exhaust gases. For some reason they stopped about 20 years ago. They were there to prevent water from coming up into the exhaust when the boat decelerates rapidly. I would guess that your engine is a bit too low relative to the water line of the boat and water can make its way up too easily. Risers between the manifolds and elbows were a common fix for this, but some new exhaust designs don't allow for this because the manifolds and risers are one piece. I'm not sure what can be done for your boat, but you should never ever pull the throttle lever to idle while on plane, always slow down gradually unless there's an emergency. Your starter (likely a Delco PG260M) has a planetary reduction gear set with a plastic ring gear that will fail if the engine is hydro-locked. You can usually just replace the $10 gear https://www.walmart.com/ip/New-Gear-Stationary-for-Delco-PG260M-Series-PMGR-Starters/824445923?wmlspartner=wlpa&selectedSellerId=101001368&&adid=22222222227257783475&wl0=&wl1=g&wl2=c&wl3=307316312058&wl4=aud-1308652556816la-551611137986&wl5=9002460&wl6=&wl7=&wl8=&wl9=pla&wl10=127117920&wl11=online&wl12=824445923&veh=sem&gclid=CjwKCAjwx8iIBhBwEiwA2quaq4hRxy-Yb_YhWfZfFOVmzNYOe-RPf3DyQXYLHmkTfiFvZ6HaymQrsxoCueoQAvD_BwE&gclsrc=aw.ds to fix the starter.

02-20-2022, 04:41 PM	#3
Nololoco Junior Member Join Date: Feb 2022 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	Figure it out? Maddie. Did you figure out where the water was coming from?

08-03-2021, 08:17 PM	#1
Juiced06GTO Senior Member Join Date: Aug 2017 Posts: 222 Thanks: 9 Thanked 88 Times in 51 Posts	Bad riser gasket then maybe, or just bad design allowing reversion up through the manifold when slowing down? I've never had a closed cooling marine engine apart so wasn't sure what they did with the heat exchanger water.

02-27-2022, 02:14 PM	#4
Maddie Junior Member Join Date: Jul 2020 Posts: 9 Thanks: 1 Thanked 0 Times in 0 Posts	No. Volvo had no idea and neither did the marina service. They replaced a bunch of parts after being pulling the engine and the boat being out of service for 6 weeks in the middle of the Summer. When I finally got the boat back I put about 10 hours on the motor without any issues.