What would cause oil to blow out of dipstick tube only while driving on 1978 360?
Hello! Welcome to justanswer!
Is the PCV valve and breather hooked up?
Did the engine have a lot of varnish/carbon inside of it?
Yes the PCV valve and breather are hooked up to front of carburator. No, there isn't any varnish/carbon inside.
Does the engine have a lot of blow-by?
Do puffs of blue smoke come out the dipstick tube while the engine is running?
No blue smoke. What do you mean by blow-by?
Blow-by is puffs of smoke out the oil cap if you leave it off or puffs of smoke from the dipstick.
If you remove the valve covers is everything perfectly clean or is ther carbon present in the oil return holes?
When I changed the valve cover in the pans, very little deposit was present.
Ok, try leaving the hose off the breather and leave the PCV out of the engine and tape off the pcv itself but leave the holes on the engine open to the free air.
Take it for a short ride. Does the dipstick still blow out?
Give me about 15 minutes to try this.
No prob. Ill be here.
I drove about 400 yards and nothing blew out. Should I drive farther?
Is the dipstick tight when its seated?
Is the rubber seal in the dipstick?
On the handle of the dipstick or the tube in the block? Never had a problem in this area before.
Ok, is the dipstick blowing out the tube or is it just leaking while seated?
Leaking while seated. When I bought the truck, there was a chrome breather pushed into the grommet which leaked oil when driven. I hooked up PCV where the breather cap was.
Get a new dipstick with a good seal in it if its not blowing the stick out the tube or off of where its seated. Put the PCV back and the breather tubes.
It is not blowing the dipstick anywhere, it is just squirting oil out of it.
Right, the dipstick itself has a bad seal in it. If the crankcase pressure was the problem, it would launch the dipstick out like a bottle rocket. The actual dipstick has no or a bad rubber oil seal in it.
Could clogged pores inside the motor cause this problem?
Yes and no. The oil would build up in the valve covers and you would have a lot of blue smoke. it wouldnt be a bad idea to remove the intake and see if the holes near the cam are open and not clogged with carbon along with all oil galleys in the heads. But a new dipstick with a new seal would problably work. When you have high crankcase pressure, seals blow out but usually the dipstick wont stay seated and blus smoke puffs out the oil cap.
Thank you, Anthony. I'll give it a try.
Your quite welcome and thank you also. Happy Holidays!!!!!!