Starboard exhaust is 20 degrees hotter than port. Normal?


3x the amount of steam coming from the starboard exhaust. Is this problem? Thanks.

  • Clogged water line?

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  • Thermostate housing?

    Votes: 0 0.0%

  • Old engine?

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  • Total voters
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So I assume you have RAW water cooling ?
Fresh / Salt Water ?
Seems like might have more corrosion on one side vs. the other perhaps ?

I think we need more info...
 
I would say you have some clogged passages somewhere between water intake and exhaust on stbd side. That is my guess...I am sure others will chime in.

What engine drive combo do you have ?
 
The 496 wasnt produced during those years. Is it a 454?

Anyways, if it's been 5 years, then maybe a more detailed inspection of the exhaust system is in order.

www.stainlessmarine.com if you want the absolute best exhaust system that will last you a lifetime of boating
 
One of my engines has a 10-14 degree difference from port to starboard. The other engine has a 5 degree difference port to starboard. What are the temperatures for each side? I wanted to compare them to mine, I don't even know what the tollerances are.
Port engine on mine is: port side 124 degrees and starboard 120 degrees
Starboard engine is: port side 127 degrees and starboard is 114 degrees

Anyone else have their numbers or the right parameters?
 
My engine is ranging from 120-140. Starboard is 140-145. & Port is 120-125. Gonna remove thermo housing and hose tomorrow and see if I can find anything.
 
Did u already pull the strainers to check them. Pull the hose off the thru hull (after u close the valve) then check for the right flow there? Open the heat exchangers in the front of the engine and check for debris? Pull the easy stuff before u pull the hard stuff.... ITs barnacle city out here now.... Some of my hoses (AC and Genny) had barnacles inside them...
 
Back to the original question; if one exhaust riser is running 20 degrees warmer than the other and the manifolds and risers have not been replaced for 5 years and it runs in salt water with raw water cooling, he should pull the risers, determine if corrosion and/or rust has clogged the passages and then have the manifolds and risers replaced. 5 years is "the long end" of service life in that condition. As FormulaFanMN posted, he can either replace them with good old cast iron or go to www.stainlessmarine.com for "lifetime" replacement. The difference is based on whether or not he is going to keep his current boat for another 5 years or more.
 
Sounds like the risers are the likely cause of the problem. Thanks for all the input I will let you know the outcome of our next step.
 
Orange Whip make sure you double check the engine temp at the sensor on the block with a laser temp gun on both engines to make sure its not a gauge off.

Also Jersey? Where do you do your boating?
 
Hes right on that one, don't trust the idiot gauges. My gauges run at 210 all the time and the boat never goes over 170 degrees (I think). I checked it by computer link and 2 guns for redundancy.
 
I wonder how this turned out!!!??? I have a 502 fuel injection. Starboard runs hotter and allows more "steam" out of the Silent Thunder box. Apparently this is normal. I just replaced the manifolds and risers with Hardin Marine (Gill replacements) and I continue to have one side run hotter than the other, I have been told this is due to the water flow and cooling, btw, i picked up some nice punch with the upgrade.... 5 years is near the end of the mani/riser life, especially here in the NJ saltwater. Check the seapump, we change ours every year. also, how is the water flow out of the back? Is anyone else still boating here? (Yo, IDCE, Captains for lunch Saturday? It looks like Sunday's customer appreciation day will be a wash.)
 
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