4winnsskipper
Petty Officer 1st Class
- Joined
- May 9, 2007
- Messages
- 204
Heres the deal,
first time out this season the water hose from the thermostat housing to the block BURST, so i ordered two new ones as a backup, thank God I did that!, and put the new one on, and pulled the drive to do ruitine maintenence, well low and behold i found a burnt up exhaust flapper clogging the exhaust, so i figure that was probably what caused the excess pressure.....i also replace the thermostat too with a new oem 160 direct from volvo. also replace the impellar with a new one, the one i toke out also looked brand new, no chunks missing. removed riser, all hoses , all were clear and flowed water really well.
fast forward to mid season
i notice when i started the engine today, the hose expanded immediatly after the engine started and thought oh no...let it idle for awhile nothing happened or changed so i drove off....well little later, kaboom goes the hose, immediately shut 'er down, replace the hose on the water (thank you backup hose) and idle back to shore...
so what is causing this!?!? Im thinking a bad headgasket pushing compression into the water jackets?????? engine does not run warm at all, sits right around 160, goes a tad above, thermostat opens and goes right down, has done that just fine all season. also, the plugs looked fairly normal, no rust or evidence of water intrusion, motor runs STRONG, boat tops out around 40mph with an oversized 22 pitch at only 4,100 rpms (too much prop)...idles all day long, starts fine, etc....im lost...need opinions.....see pictures..
first time out this season the water hose from the thermostat housing to the block BURST, so i ordered two new ones as a backup, thank God I did that!, and put the new one on, and pulled the drive to do ruitine maintenence, well low and behold i found a burnt up exhaust flapper clogging the exhaust, so i figure that was probably what caused the excess pressure.....i also replace the thermostat too with a new oem 160 direct from volvo. also replace the impellar with a new one, the one i toke out also looked brand new, no chunks missing. removed riser, all hoses , all were clear and flowed water really well.
fast forward to mid season
i notice when i started the engine today, the hose expanded immediatly after the engine started and thought oh no...let it idle for awhile nothing happened or changed so i drove off....well little later, kaboom goes the hose, immediately shut 'er down, replace the hose on the water (thank you backup hose) and idle back to shore...
so what is causing this!?!? Im thinking a bad headgasket pushing compression into the water jackets?????? engine does not run warm at all, sits right around 160, goes a tad above, thermostat opens and goes right down, has done that just fine all season. also, the plugs looked fairly normal, no rust or evidence of water intrusion, motor runs STRONG, boat tops out around 40mph with an oversized 22 pitch at only 4,100 rpms (too much prop)...idles all day long, starts fine, etc....im lost...need opinions.....see pictures..
