502 EFI crankcase vent question
#1
Registered
Thread Starter
Join Date: Jul 2007
Location: Chestertown, MD
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
502 EFI crankcase vent question
Hello I am new to the site, I have a question. I am converting my 502 mag which was carb ran, I now am installing an EFI set up(early 90's) on the motor. I can't find where to attatch the tubes from the valve covers for the crankcase ventilation, there is no spot on the flame arrestor. Need help,
thanks Steve
thanks Steve
#3
Registered
Join Date: Aug 2005
Location: sint maarten
Posts: 1,491
Likes: 0
Received 0 Likes
on
0 Posts
not CERTAIN thats gonna work... if its the mpi system its a closed system and can't vent to atmosphere without sealing up the ports in the throttle body... my stuff is later than what you are talking about and i could be wrong but but i don't think any of the efi stuff vents to atmosphere from the factory....
#4
Registered
Thread Starter
Join Date: Jul 2007
Location: Chestertown, MD
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
Well when I look on the electronic parts disc it shows both side being vented into a baffle then up via another tube. I just don't see where it goes. It is a 93-95 EFI set up.
#5
Registered
Join Date: Aug 2005
Location: sint maarten
Posts: 1,491
Likes: 0
Received 0 Likes
on
0 Posts
that tube will go to a port in the throttle body, i am almost certain. now.... on mine i seal up that port and vent to atmosphere because i don't like the oil vapor in the intake... but if you do that you HAVE to seal that port or un metered air will pass...
#7
Registered
Thread Starter
Join Date: Jul 2007
Location: Chestertown, MD
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
I am at a loss, I know it goes to the plenum some where, as the diagram shows,however where. When I got the set up, it had a plug or fitting missing in the front of the plenum, right above the thermostat housing, any ideas what goes there? Any help would be helpful, Thanks Steve
#9
mine goes right up under the throttle body / air cleaner.
http://www.mercruiserparts.com/Show_...D+ROCKER+COVER
http://www.mercruiserparts.com/Show_...D+ROCKER+COVER
#10
Registered
My 1996 Gen VI 502 MPI has a small tube from the right valve cover up to the screen on the bottom of the flame arrestor. #29 in that parts diagram.
Last edited by Pismo10; 07-04-2007 at 01:59 PM.