11' six inch exhaust hose replace

So we have a new to us 2005 Mainship 400 with a Cummins 5.9 and are working through our list of needed repairs. The 1st one is to replace the 11' long, 6" exhaust hose from the engine to the muffler. The existing 1 has cracked where the hose does a 30 degree turn, And our surveyor recommended that we replace it. We have the new and expensive hose in hand, and can remove the old hose With a bit of muscle and hacksaw work. But we are struggling with how we can install the new hose. Not having any experience with this, This seems like a difficult task to push the hose on to one of the nipples, bend the hose, and then try to get the other end onto the Engine nipple. The hose is 6" hard wall and not Very flexible. We are hesitant to pull off the old hose until we can figure out how to install the new. Pictures attached. Any assistance is appreciated. The 1st photo shows the crack at the turn.

Welcome Aboard..

Two suggestions:
1) Plug one end and fill it with boiling water. It will probably work for the high end fitting and the bend, might not help with the low end.

2) Heat gun

Good Luck,

pete

Greetings,
Mt. T. Hoo boy! I've worked with that type of hose before. Not terribly easy to handle. Just a thought...Might you be able to cut out that bad "bend" and install a 30 degree elbow in it's place? MAY be easier than dealing with an 11' long piece.

Pete
My thoughts and experience on dealing with this issue:

-- two big strong guys,
-- liquid soap,
-- pry bars,
-- come along with gripping straps
-- and strong language.

You have double checked exact hose ID for old and new? Some Chinese hose is made metric and marked "close" English units.

There are fiberglass joints available in various angles. I used a couple when I rebuilt the exhaust systems in my trawler years back and even as recently as a couple of years ago for the difficult to handle 1-inch exhaust of the tiny generator I have now. Figure the angle your need at the bend, cut the hose, and double clamp the connections. This will reduce the potential for cracking of the hose in the future. BTW small external cracking in exhaust hose is not all that uncommon and harmful, but since you are already into it.....

Check Venus exhaust hose, much more flexible than most...mine bent 90 degrees in just a foot or so. I had about a 12 foot run.

Fawcett Boat Supplies

The bend will not be your problem it’s the nipples. I took a 4 pieces of plywood. Made circles to fit inside . Screwed them together then cut in half. I heated the hose ends and drove a wedge between the 2 half moon pieces of plywood.

Sometimes it is better to pay someone who has done it a lot of times---take the easy way out. ;-)

ktdtx said:

Sometimes it is better to pay someone who has done it a lot of times---take the easy way out. ;-)

Click to expand...

And take the misery out of boat ownership? This is boating and there will be pain.

Use the right hose or plan fiberglass joints and bellows connectors well and the job doesn't have to be too hard.....well its always boat dependant.

ktdtx said:

Sometimes it is better to pay someone who has done it a lot of times---take the easy way out. ;-)

Click to expand...

+1

Also check the clamps. I replaced mine with T bolt AWAB clamps. No welds to rust and all 316 S/S.