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Water crossover between exhaust manifolds.


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I’m replacing the exhaust manifold on my Monsoon 340 motor. When removing the Water t piece from the bottom of the manifold, one of them cracked. It appears that the t piece is no longer available and you can only buy a 90 degree elbow. 
Is a crossover necessary between the manifolds or can I just use the 90 degree elbows for the inlet? 
The new manifolds are stainless steel with only 1 inlet plug.

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On 10/28/2020 at 1:37 AM, Blatchy said:

I’m replacing the exhaust manifold on my Monsoon 340 motor. When removing the Water t piece from the bottom of the manifold, one of them cracked. It appears that the t piece is no longer available and you can only buy a 90 degree elbow. 
Is a crossover necessary between the manifolds or can I just use the 90 degree elbows for the inlet? 
The new manifolds are stainless steel with only 1 inlet plug.

What kind of manifolds did you find that were stainless steel?  

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www.marinetorq.com.au

I only run in fresh water and no issues with freezing here in Australia so I have never drained manifolds. Never had a issue. I only just purchased this boat. First manifolds I’ve ever replaced. 

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I'd say the cross over is not important because it already crosses over in the front of the engine. Just incase I would contact them, they designed it , they will know if you need it.

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14 minutes ago, Bozboat said:

What does the exhaust water cross over hose actually do?

Routes the water to one central drain point.  I don't have it on my ETX's, I just use an Allen wrench and remove the rear plug to drain from each manifold.

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I have the monsoon 340 in my RLXi.  My old SSLX had the same engine with a different ECM, intake, and exhaust system and it didnt' have the cross over hose, only manifold plugs.  The only benefit I see on the cross over hose is simplicity in draining as @Michigan boardersaid.  Otherwise I don't think it serves any other purpose as the crossover simply connects the 2 low points creating one drain location.  I bought a couple of them a few years back because one broke so I just replaced them both.  This is what you're looking for, I believe.  

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I replaced the plugs in the exhaust headers with brass petcocks; much easier to drain for the winter.    I had to retap due to rust but well worth it in the end.   They have been in place for 3 or 4 years now.

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55 minutes ago, Harry B said:

I replaced the plugs in the exhaust headers with brass petcocks; much easier to drain for the winter.    I had to retap due to rust but well worth it in the end.   They have been in place for 3 or 4 years now.

doesn't one of them have a sensor in it?

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22 hours ago, jayR said:

Blatchy

How much do they charge for those stainless steel exhaust manifolds ?

http://www.precisionmarine.com.au/all-products/boat-spares-parts/stainless-steel-exhaust-manifolds-marine-torq/

$2850 Australian is about $2070 US.  Group buy opportunity?

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