www.iFourWinns.com

If I plug the water inlet hose and keep it above the waterline, can I replace the exhaust manifolds and risers while the boat is in the water? Any other precautions?

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Todd
1999 258 Vista
Volvo Penta 5.7 GSI
DP-SM

Risky, I just did mine in the driveway...
If the raw water level comes up to the top of the Y pipe,and a boat comes by and throws a wake, then you could get a lot of water in the boat. I have done thermostats in the water plenty of times but manifolds I feel is too risky. Plus if you run into trouble with a rusted bolt how will you get it out of the water, to a mechanic, if it's taken half apart by then?
Start with giving all the nuts n bolts a good soaking with PB Blaster or similar....
BTW make sure you drain the manifolds and risers before you take em apart or else water can run down the ex passage into the cylinder when you break the seal between the riser and manifold...

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

I just drained the manifolds and block. Changed them without a problem

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Todd
1999 258 Vista
Volvo Penta 5.7 GSI
DP-SM