Can the valve stem seals be replaced without taking off the head?
Replacing valve stem seals without removing the heads will typically require a couple of specialty tools to accomplish. As long as the valves seal adequately, the air pressure in the cylinder will hold the valves in place while you remove the valve spring keepers, and the valve spring seals.
How hard is it to change valve seals?
Valve seal replacement is not difficult, but it is a fairly time-consuming process. The process can take about three hours if you need to replace the sixteen valve seals.
What happens when you remove the cylinder head on a Toyota RAV4?
Head warpage or cracking could result from removing the bolts in the wrong order. Using a screwdriver with its tip wrapped with tape, pry between the cylinder head and cylinder block, and remove the cylinder head. Be careful not to damage the contact surfaces of the cylinder head and cylinder block.
How do you remove a camshaft on a Toyota RAV4?
While holding the no. 2 Camshaft by hand, remove the camshaft timing sprocket set bolt. 2 Camshaft with the timing chain wrapped on the sprocket. Remove the camshaft timing sprocket from the timing chain. Using several steps, uniformly loosen and remove the 10 bearing cap bolts in the sequence shown in the illustration.
How do you change the valve stem on a Toyota?
The Toyota intake seals are brown/gold colored on the outside and are grey on the top rubber part. The intake seals also have “NOK” printed on the top. Put a few drops of oil on the seal lip, seal interior, tubing and valve stem before pushing the seal down. You can press the seal down most of the way by hand.
How do you replace valve stem oil seal?
By removing two valve springs at a time you can compare the new seal to the old seal to be sure the new seal is pressed fully into place. You could feel how much space is between the bottom edge of the seals and the cylinder head. It’s just a few millimeters.