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Riser removal

C

captal

Contributing Member
"I have a pair of 350 crusader

"I have a pair of 350 crusaders, 1989 year model,FWC in a 30' Luhrs. Replaced the riser and elbow on the port engine outboard side. The riser and elbow had clogged up and stopped flowing water. Previous owner never change it so it melted the exhaust hose and muffler. Replaced all that and engine runs fine. My question is: is there a way to remove the riser from the manifold without 12 skinned knuckles and team of mules???? I took the old mainfold off to make it easier to work with but the riser mounts on with 4 long stainless studs. After about 400 hrs they were grown into the riser. Tried all the normal stuff, penetrating oil, heat, hammers, etc. No luck. Some of the more experienced guys (old timers) in the boat yard said the only way to get them apart is torch or cutting wheel. Finally took a grinder and cut them apart. I would like to check the condition of the other risers but don't know if there is a way to do this other than total destruction and replacement. Don't mind the cost of replacement in the yard vs 50 miles offshore, but hate to go through all the trouble if it isn't needed. Anyone have any suggestions. I'm a pretty fair mechanic and do have one of the infamous infared heat guns. Can I use the gun to check temp and tell if they are working properly? Any thoughts on removal or testing would be greatly appreciated. Thanks!!! AL"
 
"I would toss the whole shaban

"I would toss the whole shabang overboard and replace the risers AND manifold's... I'm in the process of doing that right now. Removed the engine to do it, and discoverd a couple of other concerns (in the 50 mile off shore category) that needed attention too - wouldn't have gotten there without pulling the engine...

The extra cost is worth it, IMO..."
 
"I replaced my risers and mani

"I replaced my risers and manifolds a few years ago on two 82 350's. They had about 700 hours on them when I did it and it was quite a job but I was able to seperate them. I don't recall exactly the process, but it didn't involve a torch. I know at one point I did wedge a VERY small screwdriver in the gasket (which is pretty thick) and also used a wood chisel (because it was much thinner than a cold chisel). Once you get that first 1/1000 of an inch, the rest comes easy!!
"
 
"I should have pointed out tha

"I should have pointed out that they were on the boat when I took them off. They were in very good condition and probably re-usable (definitely not damaged by removal). The only reason I dug into it was I had a water pump impeller go bad and the base of the casting that connects to the exhaust hose had gotten hot enough to burn all the paint off, so I really didn't know how bad it would have been inside"
 
"Most stubborn parts can be se

"Most stubborn parts can be separated by HEAT and some, ah, persuation, but not while they're still attached to the engine (and in the boat).

Jeff"
 
Mine separated when I persuade

Mine separated when I persuaded them with a 5 lb maul. I was replacing the manifolds too at the time. I would definitely replace the manifolds while you're in there. It's such a heavy job that I can't see doing it again in a few years. Just to get at the manifolds.
 
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