Universal breather check valve
Does anyone make a universal check valve for a breather hose? This Toyota has been heavily modified to where it has nowhere for the breather to go in the air cleaner, and just has one of those k&n style breathers on the valve cover. The customer states that over 3k rpm, it pushes oil all over the valve cover, then it runs onto the exhaust, and smokes so bad, that he can't drive it. I would like to be able to run a hose over to the firewall for that breather, and possibly install a check valve as an attempt to lessen the issue.
I'm aware that it is probably going to need rebuilt, but his 17 year old son is driving it, so he wants to wait until it's absolutely necessary.
Sounds like it needs a baffle in the valve cover to prevent oil purge (possibly it is missing). If it has a pair of K&N breathers then the PCV has been eliminated, that's not good. Sounds like a Hot Rod magazine modification… looks good in the pictures, but not practical. The 2.4 engine was best left alone, they are good simply by design.
Why not vent it into a catch tank? That much pressure can due plenty of damage to seals etc. if restricted. A remote catch tank properly set up should catch the oil.
It had a catch can on the pcv side, and eliminated that as an attempt to lessen the leakage. Should I put larger fittings on there, and try that.
I would attempt to get the pcv system operating and check the crankcase then. If it has positive pressure at idle you most likely can't stop the oil issue. A catch can that is large enough should stop raw oil, but again if it can't the rebuild is the answer. It isn't overfull is it. Windage with do the same thing to a good engine.
Sounds like a lot of blow by. Probably should check crankcase pressure and see if a breather could even provide enough vacuum.
sounds like the engine needs a rebuild because of too much crankcase pressure. You can run a hose to a catch bottle so the oil gets caught in the bottle and the crankcase can vent out the top of the bottle. You can attach the filter to the top of the bottle. That is just a temporary bandaid till the engine can be rebuilt. Of course, that would not be smog-legal in California.
Sounds like you have incredible blow-by. Rings are broken or weak. 3000 should be normal operating conditions. Pull the oil fill cap and start engine. Put your hand over the hole and see how much pressure you have. Then rev it a little to see how bad it is. If it's been heavily modified, I'd bet it's been road hard and the rings are gone. If you have that much blow-by they may have done…
Just dump it in the exhaust. speedwaymotors.com/Kevko-Aluminum…
Bite the bullet and rebuild or find a compatible used replacement.
Sean, Back in the late 80s and 90s when we were working on these, we had crankcase pressure problems. In the shop at idle, all will appear fine. 2500 rpm under a load for a few minutes, and oil will find it's way out the easiest place it can. I remember replacing cam and crank seals, only to have them leak as soon as I was done. sounds like it needs rings. Mike
Clean out the PCV, replace the valve and install catch can inline with the breather. Sounds like you need overhaul….
This vehicle originally had a catch can on the pcv side. I rerouted the catch can on the breather side. With the oil cap off, I can clearly see that there is no baffle under the breather, and it looks factory, but these always had a breather hose feeding the top of the air cleaner, so they never really splashed out. I will have him drive it, and see if there's an improvement. If it starts…
The original breather hose feeding off of the air cleaner worked fine when you have a good tight engine with no blow-by and a good PCV valve sucking air through the breather hose. A baffle wasn't needed then. Sounds like you've done about all you can do. Short of getting lucky by adding some Rislone or Marvels Mystery Oil to free up stuck rings. Or oil honey to thicken the oil.