[Unknown User]

Today I did a full valve adjustment job on my 73 240Z and found that everyone of my valves were out of tune even thought i had a valve adjument done by pros about 4 months ago. What would cause all my valves except 1 to be out of adjustment? Today i thought I was doing it all wrong but then when I started the car and it purred like it was new i thought it must have been something wrong wtih my valves for all of them to be messed up.
I noticed they were all really screwed down tight.
Could that be my valve seals??

Dustin Morris

 

[Steve]

Re: Valve Adjustment Question on a 240Z

> Today I did a full valve adjustment job on
> my 73 240Z and found that everyone of my
> valves were out of tune even thought i had a
> valve adjument done by pros about 4 months
> ago. What would cause all my valves except 1
> to be out of adjustment? Today i thought I
> was doing it all wrong but then when I
> started the car and it purred like it was
> new i thought it must have been something
> wrong wtih my valves for all of them to be
> messed up.
> I noticed they were all really screwed down
> tight.
> Could that be my valve seals??

You may be on to something. Do you have hardened valve seats?
> Dustin Morris

 

[Unknown User]

Re: Valve Adjustment Question on a 240Z

> You may be on to something. Do you have
> hardened valve seats?

I don't beleive so, I am pretty sure this car has never had a valve job done to it.

Dustin Morris

 

[Steve]

Re: Valve Adjustment Question on a 240Z

> I don't beleive so, I am pretty sure this
> car has never had a valve job done to it.

> Dustin Morris
I would consider hardened valve seats a good investment, especially with the unleaded gasoline today. (BTW: I consider the elimination of leaded fuels a good thing, despite the hardships it creates on our classic cars. If you want to debate this issue, email me privately.) I had hardened seats put in when I had my engine rebuilt.