Leaky Valve Seals?

[Bad_Byte]

Seems to me that the nature of the Gen 1 beast is to run a little warmer than the Gen 2's.

Not a flame just an observation.

With that in mind I was wondering about changing out valve stem seals. According to the 1994 maintenance manual its possible to remove the valve springs without removing the heads. ?? Sure simple get a valve spring compressor set the piston TDC and pump the cylinder up to 100psi to hold the valves in place.

Only one problem.

How do you compress the inner spring? These puppies have both an inner and an outer valve spring. Seems like compressing the outer spring would not be enough to cause both springs to compress.

Any miracle workers out there familiar with this procedure that may like to impart some knowledge on me.

As always greatly appreciated.

 

[HP]

First, why are you concerned about changing valve seals?
Are your plugs showing sings of oil foiling? Have you hooked up
a vacuum dial to your intake manifold- this would tell you definitely if your seals on your intake valves are leaking.
Vacuum dial cost about $19 - a fast fluttering from 5 to 20 at
idle would indicate leaking intake guides/seals. If seals are
bad, there is a valve spring compressor you can use without removing your heads. It grabs on to the lower spring coil and
compresses against the valve spring collars, on top of the valve
springs, so it will compress inner and outer springs. If you have your pistons at TDC, you may be able to accomplish this without compression of cylinders, since the pistons themselves would prevent valves from dropping below valve guides. By all means, think hard about the necessity of this, since it can always be done, as part of a package, later when your heads are off.

 

[Marc Lublin]

The valve spring compressor compresses both at the same time. You got it right, piston at top dead center and some air pressure in the spark plug hole and the springs will come right off. Just did it over last weekend. Keeping the piston at top is just to insure you don't accidentally drop the valve too far and loose it in the cylinder. Even with the piston all the way up, I think it probably still drops down too far to compress the springs without air pressure.