5432 Diesel Engine Exhaust Riser

[fogbank]

I have looked high and low for a source for a new exhaust riser for my 5432 engine in the San Francisco area but have been unsuccessful. All I have been able to find is M40 references for which there are 2 types of risers, one has a large hump on it and the other is a more normal pipe bent at a 35 degree angle.
Any assistance in finding a source for this part (I don`t understand why there are two differently shaped parts) would be greatly appreciated.

Thank you.

 

[footrope]

Replacements, especially cast steel ones, can be hard to find. My replacement riser was custom built in 2004 from three stainless steel 90-degree elbows welded together, plus a little more pipe. The engine end was threaded to match the flange on the engine, and the sea water port added as shown in the picture.

It is still going strong after 17 years and over 1000 engine operating hours. A carbon ring that forms inside, around the area of the sea water port, needs to be cleaned out every couple or three years, which I have done using a screwdriver to get the big pieces and then a wire wheel and a drill. The riser doesn't have to be removed to clean it. I don't know where you would get that done in the Bay area, but a few phone calls to boat yards will probably get you in touch with a fabricator. A good fabricator can provide a riser that will last you a long time. Good luck!

 

[Reefpoints]

Often there are 2 versions for this part depending on how deep your engine sits in the boat. One has a riser (bigger hump) for engines that sit lower in the boat (which consequently have more risk of backflow from the wet exhaust system). My understanding is that sailboats usually sit below the water line and use the riser version.

 

[Christian Williams]

Universal 5432/M40 exhaust elbow?

Looking at the exhaust on my 5432 last weekend it occurred to me that it could be improved. The exhaust exits the riser to a hose that is tapered and clamps to a 90* bronze plumbing fitting then to the waterlift muffler. The 90* fitting is a standard marine plumbing fitting with screw in hose...

ericsonyachts.org

 

[fogbank]

Often there are 2 versions for this part depending on how deep your engine sits in the boat. One has a riser (bigger hump) for engines that sit lower in the boat (which consequently have more risk of backflow from the wet exhaust system). My understanding is that sailboats usually sit below the water line and use the riser version.

Makes sense. Thank you for the insight.
Fogbank

 

[fogbank]

Replacements, especially cast steel ones, can be hard to find. My replacement riser was custom built in 2004 from three stainless steel 90-degree elbows welded together, plus a little more pipe. The engine end was threaded to match the flange on the engine, and the sea water port added as shown in the picture.

It is still going strong after 17 years and over 1000 engine operating hours. A carbon ring that forms inside, around the area of the sea water port, needs to be cleaned out every couple or three years, which I have done using a screwdriver to get the big pieces and then a wire wheel and a drill. The riser doesn't have to be removed to clean it. I don't know where you would get that done in the Bay area, but a few phone calls to boat yards will probably get you in touch with a fabricator. A good fabricator can provide a riser that will last you a long time. Good luck!


View attachment 39796

Replacements, especially cast steel ones, can be hard to find. My replacement riser was custom built in 2004 from three stainless steel 90-degree elbows welded together, plus a little more pipe. The engine end was threaded to match the flange on the engine, and the sea water port added as shown in the picture.

It is still going strong after 17 years and over 1000 engine operating hours. A carbon ring that forms inside, around the area of the sea water port, needs to be cleaned out every couple or three years, which I have done using a screwdriver to get the big pieces and then a wire wheel and a drill. The riser doesn't have to be removed to clean it. I don't know where you would get that done in the Bay area, but a few phone calls to boat yards will probably get you in touch with a fabricator. A good fabricator can provide a riser that will last you a long time. Good luck!


View attachment 39796

 

[fogbank]

I appreciate your recommendation. Looks like a nice clean piece of fabrication. May I ask what type of threaded pipe the fabricator used to weld to the stainless steel 90 degree elbow fittings?

Thank you
Fogbank

 

[Kenneth K]

Many have built their own riser/elbows out of off-the-shelf stainless pipe fittings.

E32-3 - Mariah Part II: Exhaust Riser/Elbow Replacement with Support Bracket

As I mentioned in the previous post, I was unable to remove the bottom flange nut that held the exhaust flange on to the exhaust manifold. It wasn’t simply a case of the nut being frozen on the stud; there just wasn’t enough physical clearance...

ericsonyachts.org

 

[footrope]

I appreciate your recommendation. Looks like a nice clean piece of fabrication. May I ask what type of threaded pipe the fabricator used to weld to the stainless steel 90 degree elbow fittings?

Thank you
Fogbank

I do not have the details on the type of stainless steel used. A fabricator can probably recommend what stainless type to use, if it makes any difference. Those threads are tapered (pipe threads) and they were cut onto the elbow to match the flange threads. You will need to supply the flange from your engine to the fabricator so he can measure and match them.