Can valve seals be replaced without taking head off?
Yes and no.
Depending on how the lifters and rocker arms sit on the valves, you might be able to apply air pressure to the cylinder to keep the valves closed while taking the springs off. If you take the springs off without pressure the valves can fall into the cylinders.
The seals are under the valve springs.
SOURCE: 1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse
You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.
SOURCE: replace valve stem oil seals
Make up an airline fitting that will screw into spark plug hole, or buy from autoparts , or tools supply place. You put compressed air in cylinder while changing, which holds valves in place.
SOURCE: 94 toyota paseo need to replace valve stem seals
YES if you don't have the right tools
or the know how.
may want to take this one to a good shop.
SOURCE: can you replace valve guide seals without taking
Yes, you can, but you need to have a special tool that screws into the spark plug hole, so that you can attach an air hose to it to apply pressure inside the cylinder against the back side of the valves to keep them from falling down into the cylinder. The problem is that if the valve seat is not sealing, such as is commonly the case when a valve is burned, then the tool will not help you and you will have to remove the head anyways. Ford makes special tools for removing the valve guides and to install the seals.
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