Johnson V4 Crossflow recirculation system

**spybot** · 12-07-2017, 01:22 PM

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 ?

**rjdubiel** · 12-07-2017, 01:52 PM

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.

**FMP** · 12-07-2017, 02:02 PM

Did you notice any issue with slow speed loading etc or doesn't apply to your usage?

**spybot** · 12-07-2017, 03:38 PM

Thanks RJ just the info i was looking for. Thats a good question FMP. Did the slow speed get effected ?

**rjdubiel** · 12-07-2017, 03:43 PM

Originally Posted by FMP

Did you notice any issue with slow speed loading etc or doesn't apply to your usage?

Never had a motor with them in use. I was told they were just for EPA regulations. Older crossflows do not have them at all.

**spybot** · 12-09-2017, 09:21 AM

Originally Posted by rjdubiel

. The threads are 1/4 pipe thread, you can get those plugs and do that to all of them as well.

Anyone know what the UK equivalent is in BSP ?

**71V153** · 12-09-2017, 07:56 PM

Not an EPA thing.

**spybot** · 12-09-2017, 08:06 PM

Originally Posted by 71V153

Not an EPA thing.

What does it do?

**powerabout** · 12-10-2017, 12:49 AM

makes them idle properly

**spybot** · 12-10-2017, 07:44 AM

Originally Posted by powerabout

makes them idle properly

In what way ?
If i add CCMS reeds will they not do the job better ?

**powerabout** · 12-10-2017, 07:57 AM

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.

**spybot** · 12-10-2017, 08:33 AM

OK i understand it now. I will have to look for two new plastic ones as two of mine dont work. May even have to bite the bullet and order 4 of the brass ones at £150

**spybot** · 12-12-2017, 10:02 AM

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