VP 5.7 gsipwtr riser starboard getting hot

[SD2600]

Gents I have lurking for some time absorbing all of the great advice but now i have a problem i need help with. I have a 2000 sea swirl striper 2600 with a VP 5.7 gsipwtr. My problem is that my starboard riser is getting hot. Back story is the boat was dry stored for about 7 years before i took ownership. I have been going through it to make her ready to fish tuna this season. I have pulled the risers and manifolds. They both had a lil wear but cleaned up nicely. I have replaced all of the hoses as they were in bad shape. a new thermostat housing, thermostat, temp sender, and impeller were installed. While running the boat on the muffs the starboard riser was getting hot and started to smoke a little. So i replaced the starboard riser, after running it again on the muffs, it still is hot to the touch. i can place my hand on it for about 4-6 sec. The port riser and manifold run ice cold. Also the starboard manifold runs nice and cool. My boat does not have flappers in the y pipe so I assume there is no blockage from a damaged flapper. The impeller I took off was complete so i assume there are no broken pieces lodged anywhere. I have taken each hose that supply the manifolds off one at a time while hooked to the muffs and each hose flows water equally. I have heard that the starboard side runs a little hotter than the port based on the flow design. but I feel that Im still to hot. I haven't shot it with an IR gun yet but plan to in the next few days to get an actual reading. My temp gauge read 170 degrees. Is there a chance that the starboard manifold may be occluded in such a way that it cools appropriately but doesn't allow the brand new riser enough water? My thoughts are that if it has a blockage that the water might be forced to the port side... the supply hose to the starboard side is not ridged or pressurized in any way... A test I might try is while the engine is off, to pull the supply hose off the starboard manifold and flow water into it via a garden hose. Is there any chance that my valves or piston could be subject to damage? Im a lil lost hear fellas. any thoughts are greatly appreciated. thanks dustin

 

[Fishhead-1]

Your on the right track. I have had the water fittings going into the manifolds get partial plugging or complete plugged before especially in salt water then sitting even after flushing. May have to remove manifold and pressure wash water cavity out and remove flaking rust or inspect and replace if necessary. Most change those manifolds and risers out from 3 to 5 years.

 

[Scott Danforth]

welcome aboard.

if you are in salt water, pull the riser and look at the passages. you may be at the time to replace the manifolds and risers. they last about 7 years in salt water

 

[SD2600]

thanks for the input fellas, any input on the garden hose test directly into the manifold while the engine is off test? possibility of damage?

 

[Silverbullet555]

thanks for the input fellas, any input on the garden hose test directly into the manifold while the engine is off test? possibility of damage?

I'm interested in the answer to that question.

You might try the clear hose test to see the quality of the water flow. I developed an issue last year with one side running hot. It was new so it caught my attention. Clear hose sections are my next step.

 

[Scott Danforth]

thanks for the input fellas, any input on the garden hose test directly into the manifold while the engine is off test? possibility of damage?

And what are you trying to test for?

Pull the line feeding the manifold and put in a 5 gallon bucket. At 1000 rpm, it should fill the bucket in about 30 seconds. If it does, your issue is water thru the manifold, or technically, water unable to go thru the manifold.

Or just pull the riser and look. Im betting the passages are plugged with rust and you need new manifolds and risers

 

[SD2600]

Scott the test would confirm if i have a blockage in my y-pipe not allowing enough flow out. My guess is there is some sort of blockage inside the manifold that i couldn't see when i originally pulled them and cleaned them up.. allowing some water through.. well at least enough to keep the manifold cool but not the riser... I hopefully we be able to dig into it in a few days.. ill will post the findings. thanks again for your input

 

[SD2600]

ok. so i ran the hose while the motor was off and flushed the manifold and riser. when i first removed the feeder hose a fair amount of black water came out.. after a few flushes with the hose it ran clean.. i hooked it up to the muffs and ran it. temp on the port side was 85-90. starboard was 110-120... i felt good and dropped it in the harbor.. ran around the harbor at idle and at throttle. the temp seemed to like the throttle but still stayed roughly 20 degrees warmer than the port... the harbor cruz built my confidence so i took it out of mission bay and ran up to la jolla and back.. everything ran great.... Ill keep an eye on it for the future.. thanks for the input fellas