valve cover smoke?
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Freshman User
Joined: Jan 2005
Posts: 42
Likes: 0
From: olympia,WA
valve cover smoke?
ok i have a 360 in a 73 f-100 4x4 and just got it running again from it sitting for awhile do to a wiring problem and now it runs but when i get on the trottle it blows back out from the the breathers on the valve cover?
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
PCV GOOD! It helps keep deposits inside the crankcase to a minimum.
It's not unusual for a motor to smoke a little after sitting. Should clear up when the rings re-seat. Some ATF or MMO in the oil will free any gummed up parts.
It's not unusual for a motor to smoke a little after sitting. Should clear up when the rings re-seat. Some ATF or MMO in the oil will free any gummed up parts.
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
So basically, he needs to hook up a working PCV, then drive the thing around on a regular basis.
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Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
No PCV to suck the smoke and fumes out of the crankcase it is gonna smoke out the breather, everytime all the time. In the old days before PCVs there was a road draft tube that created a suction as you moved down the road and pull the fumes out. Without something to purge the crankcase you will have what you have.
Senior User
Joined: Jan 2005
Posts: 174
Likes: 0
From: Lynchburg Virginia.
Pull the plugs and pour about a tablespoon of Marvil Mistery Oil in each cylinder. Let set overnight. Turn it over,still with the plugs out. Put plugs back in and start. It will smoke for a while, till it burns the oil out. If the rings are stuck this should help. If it still smokes I would say the rings are worn out. Blowby is caused by compression gases going by the rings and being forced out the breathers. PVC or not excessive blowby is a sign of worn rings.
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
The oldies without the PCV had a mesh oil separator on the bottom if the intake that could get coked up. It would stop the road draft tube from (drafting?) getting any flow from the crankcase. Real PITA to take that anvil intake off to clean. also hard to clean unless you have a hot tank. I am ignorant of when they stopped putting the separator on, but the PCV came into use around '63. I think.
tom
tom