how do you adjust the valves on a plymouth 318 engine.1968 model?

Answer 1

Are you sure this is a '68 318 engine? The '68 was the new "thin-wall casting small block" 318, which was introduced in 1967 and stayed in production through the 1989 model year. This engine had hydraulic lifters, which fill with motor oil and automatically adjust themselves to the proper height to open the values. From 1957 through the 1966 model year, this engine was known as the "polyspherical" 318. This engine did have solid lifters which did have to be periodically adjusted so the valve lash was not out of tolerance. This is accomplished by taking off the valve covers and using a feeler gauge to set the clearance. You can easily tell the difference by the valve covers. The newer engine covers are held by 5 screws around the edge and the older engine is held by two screws located in the middle of the cover.

Answer 2

Although you don't have to adjust the valves normally because they are self adjusting hydraulic.They do sometimes make noise if that is your problem.The noise may be coming from a lack of oil pressure getting to the valves.If it is just one or two that are noisy.Remove the cover and run engine till warm.With a wrench, tighten rocker just til the noise stops.Do not 'over tighten' Get oil pressure checked.

Answer 3

If it's a 68 motor, you don't. It did not have adjustable rocker arms. It had hydraulic lifters.

Answer 4

Whenever i post a question, even if it is the simplest one, nobody can provide me a proper informed answer . what happened to people that actually make the effort to write an answer??

Answer 5

are they all noisy if so the rocker shaft is woreout

Answer 6

could also be a collapsed lifter.