Volvo 3.0 cooling hose rupture

[bholsinger]

I'm stumped and was hoping to get some ideas. I have a 1998 Glastron 175 with a Volvo Penta 3.0 Cobra SX 135 hp engine. Some history…being a newbie I didn’t do the proper maintenance before getting started. On my second trip out last spring I lost my impeller and overheated big time. That caused a cracked manifold that has since been replaced. I'm running at about 175 degree and I keep busting a cooling hose (that connects from the thermostat housing to the circulating pump). I’ve gone through three so far and won’t go out without a spare. They've all split in the same location...the top half of the hose exiting the thermostat. If you look on the inside of the hose, you can see a water line about half way up the diameter of the hose. It looks like the top half might be exhaust gases but not sure how that would get there. It appears as if the system is not staying filled with water. I did a raw water test and I'm getting good flow coming in. I just had the head decked and resealed so I should not be getting any pressure leak from the cylinders. Something is putting a lot of pressure (and / or heat) on the hose and causing it to break. Any ideas would be appreciated.

 

[Bt Doctur]

Re: Volvo 3.0 cooling hose rupture

remainig pieces of old impeller clogging something up,a clog not letting the water out .I think your temp should be more like 140 deg.

 

[bholsinger]

Re: Volvo 3.0 cooling hose rupture

Thanks for the note bt doctur. I replaced the thermostat last summer with an oem 160 degree. I may be running a bit hot but shouldn't it be running in the 160-170 range with a 160 thermostat. Shouldn't the hose be able to handle that regardless. Seems like I'm getting direct heat that is causing the rupture.

 

[Bt Doctur]

Re: Volvo 3.0 cooling hose rupture

drop an email here EJDSR251@aol.com

 

[bholsinger]

Re: Volvo 3.0 cooling hose rupture

Just got word back from that mecahnic that I have a small crack in the cylider. I'm sure this happened when I overheated last spring. Working towards a new engine now. Thanks for the input.