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Thread: OMC Crossflow Circulation System
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07-14-2007, 11:17 PM #15000 RPM
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OMC Crossflow Circulation System
I’d been have a rough idle problem with my 1988 Johnson 175hp so I started looking at the recirculation system. I think there are 6 recirc valves -- 2 under each of the 3 carb pairs. I tested the valves according to the manual with a syringe of alcohol and they appear to be working correctly as a one way valves.
The recirc valve hoses are connect together in 2 groups of 3 with each group having a hose going to the manifold -- one port is between the top and middle carbs and the other between the middle and bottom carbs. The manual says the manifold ports should flow in and out using the syringe test. Both of mine are fully clogged. No flow either way. The manual shows a special tool to unclog them. I’ve tried a fine wire which I can push in about an inch. I’ve also tried carb cleaner and compressed air. No luck.
How do I unclog the manifold ports? Do I need to remove the intake?
Thanks for any advice.
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07-16-2007, 08:19 AM #25000 RPM
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Well.. maybe no one has had the ports clogged?
Let me ask this...instead of draining the recirc valves into the 2 ports between the carbs that are clogged, could I just tee them into the front cover drain hose?
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07-16-2007, 12:10 PM #3
Isn't the special too just a small drill bit?
They are suppose to move the oil that pools near the bottom of each reed cage in the intake and put it in the crankcase. This is after prolonged idling, so I am told. I have heard of people removing it completely, but Mr OMC put it there for a reason. Removing the intake is not that big of a chore.
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08-05-2007, 09:11 PM #45000 RPM
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Well, I pulled the intake manifold and found the OMC gasket I used between the block and manifold to install fiber reeds several years ago did not have the correct holes to allow the drain ports to have a passage into the block. The new gasket I now have is identical except it has 2 additional holes for the recirulation path. I either got a bad gasket or the wrong one. I hope this fixes the problem!