Testing Exhaust Manifold

[FreeBeeTony]

My IL6 Mercruiser 165 is running hot (~185). I am suspecting a restricted exhaust manifold because both water pumps, thermostat and riser are new.<br />How can I check to see if it is clogged? I was going to connect a garden hose to the input and see if it ran clear but a friend said he didn't recommend this because w/o the engine running the water might not get passed the flapper and go back into the cylinders! I am trying to verify the manifold w/o removing it.

 

[iloveboatingny]

Re: Testing Exhaust Manifold

Since you narrowed it down to the manifold, I would remove it for inspection of rot or rust.<br />And while its off, replace it. Shouldn't been more than 6 bolts<br /><br />just my 2 cents.<br />lou

 

[FreeBeeTony]

Re: Testing Exhaust Manifold

Replacing it is easy........it's the cost, ~$500!<br />It didn't seem rotted/rusted when I put it on but it might be clogged.

 

[Bondo]

Re: Testing Exhaust Manifold

Tony,<br />Pull the riser off the manifold.... Then you'll be able to see into the water jacket... That's the most common Clog Spot....