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imartin

03-22-2021 04:30 PM

PCV Valve

Manual says every 100 hours, or once a year. Honestly, I think im still on the original ones from 2007. Engines run great (twin 525efis, 189 hours). Question, you guys changing yours often?

F-2 Speedy

03-22-2021 04:48 PM

The manual is Mercury ? they sell parts, enough said.........if it still rattles, blows and don't suck, its fine...........:D

ThisIsLivin

03-22-2021 05:08 PM

What's a PCV valve? :-)

SB	03-22-2021 05:11 PM

Lol^^
Mostly the blue motors have them.

f_inscreenname

03-23-2021 03:50 PM

Ya they are used burn moisture off from the oil and blow by. No reason to have one in a boat motor....

imartin

03-23-2021 11:54 PM

Lol on the replies. Yep, Mercury Racing wanting all these things changed. 190 hrs on the motors today and running like a top. Guess I won't be too concerned with them then. Thx guys...

carnutsx2

03-24-2021 12:46 AM

Positive crankcase ventilation. Its a one way check valve , It directs oil vapors generated by blowby from the valve covers into the aircleaner to be burned rather than vented to the air in the engine compartment.

Gimme Fuel

03-24-2021 06:58 AM

Quote:

Originally Posted by f_inscreenname (Post 4782839)

Ya they are used burn moisture off from the oil and blow by. No reason to have one in a boat motor....

I got rid of them and puny breather system on my tired 502 MPI's and went from burning a quart in 30 minutes of hard running to burning a quart maybe all season.

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