Elbow hot on one side

[Seatrek]

I have twin 350s (1986) and one side of the of the port engine elbow and riser is showing 190 degres using a heat gun. The other side is reading 90 degrees. No overheating on the gauges but there was some steam. The elbow and risers are 5 years in salt water. Any suggestions?

 

[Mark McM]

I am NOT an expert but I just changed mine so I can help you there. I would say that you have some kind of restriction in the raw water flow through the riser and then through the elbow. When you remove the drain plug at the bottom of the riser do you get any water? It could be plugged and not letting raw water through to cool it! I'd check the raw water pump too. When did you last change the impellers?

 

[fastjeff]

The hot elbow is being starved for cooling water since the cool one is getting most of it. You need to remove the exhaust hose off the hot elbow and rod out the water outlet passages. I did this with a coat hanger in an electric drill.

Jeff

 

[knuckle47]

Geez,
I second those opinions...5 years in salt but returning home in the bay makes the 5 year time line a big deal for me

 

[makomark]

You may get thru the rest of the season if they are clogged and you clean them out...personally, I'd get a pair of risers , elbows, and a gasket set and just change them while apart...it will save you time in the long run.

 

[bcclew]

5 years risers and mans out next you will get a leak water in the oil not worth it get rid of them

 

[RicardoMarine]

If after fully examining the manifold and riser sea water "transfer ports", and after you see no apparent tell tale signs......., look at the division of the spent cooling water that leaves the Heat Exchanger..... or if raw water cooled, the water path from the engine.

Somewhere in your system there will be some type of splitter (or dividing mechanism), that is suppose to split the spent sea water equally between both exhaust manifolds.
If this is not dividing correctly, all else may appear to be OK, but you will have the uneven temperatures that you are seeing.

If closed system cooled, often this is a copper T splitter fitting.
Or.... the Heat Exchanger itself may split the spent sea water via dual sea water outlets.

If raw water cooled, you may have a T stat housing that splits the sea water.
If so, check to see if something is restricting the flow to the side that is warmer.

Whatever you do, try to NOT add restriction to the cooler side in hopes of increasing flow to the warmer side!
Instead find out what's restricting the side that is running warmer.

How about posting a few photos of your cooling system for us?????

 

[fastjeff]

Here's what you need to do. The photos are self explanatory.

Jeff