suss1173
Active Member
- Jul 11, 2013
- 411
- Boat Info
- 05 390 QSB 5.9,s
Past- 01- 340 -7.4 Horizon's. Pachanga 27- twin 350's, 94-300 twin 350's
- Engines
- Twin QSB 5.9’s
I replaced the exhaust manifolds, extensions,and elbows toward the end of last season. However, I did not get to use theboat much after doing the work. I notice the elbow on one side is very hot.When I put my hand on the outer elbow (top part) it is very hot where all ofthe others are just warm. I’m guessing I put the gaskets in the wrong spot.
After I took apart the side that was getting hot and realized I had therestricted gasket with 2 open slots on the bottom and top of the 6' extensionblock. I left a restricted gasket (2 open slots fore and aft) on the top of theextension block and replaced the lower gasket that sits between the extensionblock and the manifold with a gasket that’s open all four sides. Unfortunately that did not fix the issue, theone elbow is still getting hot while the other side is cool.
I don’t know if this is a related issue,but I also notice the motor starts to overheat if I let it idle. If I increasethe RPM's to about 1k RPM or more, the temp comes down to the normal 145 rangeregardless if at the dock or underway. FWIW- the water pumps were replaced lastseason.
Any help would be appreciated
After I took apart the side that was getting hot and realized I had therestricted gasket with 2 open slots on the bottom and top of the 6' extensionblock. I left a restricted gasket (2 open slots fore and aft) on the top of theextension block and replaced the lower gasket that sits between the extensionblock and the manifold with a gasket that’s open all four sides. Unfortunately that did not fix the issue, theone elbow is still getting hot while the other side is cool.
I don’t know if this is a related issue,but I also notice the motor starts to overheat if I let it idle. If I increasethe RPM's to about 1k RPM or more, the temp comes down to the normal 145 rangeregardless if at the dock or underway. FWIW- the water pumps were replaced lastseason.
Any help would be appreciated