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12-07-2017, 01:22 PM #1
Johnson V4 Crossflow recirculation system
OMC recirculation system that is on v4 Crossflows.....what does it do, and what would happen if it was removed/plugged?
On my motor (V4 1980 Crossflow) i have 4 check valves (Plastic ones mot brass as the norm) they are on the intake manifold below each carb.
The check valves hoses lead to each by pass cover.
Are these needed ? i have read that they help idling but i will be fitting CCM reeds so can i do away with these ?Last edited by spybot; 12-09-2017 at 06:55 AM.
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12-07-2017, 01:52 PM #2
I have mine all pluged with a rubber cap on my motor and actually got some plugs for it as on one of my motors had the brass check valve and someone tried to solder it closed but it didnt completely plug it up. The threads are 1/4 pipe thread, you can get those plugs and do that to all of them as well. I think it was an EPA thing to try and drain extra oil/gas back into the motor to be burnt and not drip into the water.
1973 Viper - sold
1978 Viking - sold
1995 XB02
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12-09-2017, 09:21 AM #3
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12-07-2017, 02:02 PM #4Screaming And Flying!
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Did you notice any issue with slow speed loading etc or doesn't apply to your usage?
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12-07-2017, 03:43 PM #5
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12-09-2017, 07:56 PM #6
Not an EPA thing.
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WALK TALL AND CARRY A BIG BILGE PUMP
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12-09-2017, 08:06 PM #7
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12-07-2017, 03:38 PM #8
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12-10-2017, 12:49 AM #9Screaming And Flying!
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makes them idle properly
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71V153 liked this post
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12-10-2017, 07:44 AM #10
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12-10-2017, 07:57 AM #11Screaming And Flying!
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its called the puddle drain system.
it is designed to drain ( pumped via one way valves) any fuel away that puddles after the reeds at low speed and feed it back into the engine in a manageable way.
It was changed over the years to make it work better.
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12-10-2017, 08:33 AM #12
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12-12-2017, 10:02 AM #13
Is this a cheap alternative ? I am struggling to find the plastic ones i already have
https://www.ebay.co.uk/itm/One-way-I...19.m1438.l2649
They open at Opening pressure: >0.015MPA
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12-12-2017, 06:50 PM #14Screaming And Flying!
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cheap enough to try.
Just see if they pump fuel when idling
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