Wachuko

I was pulling out the old valve stem seals and this is what I found in two valves guides (the others are fine). What really drives me mad is that I had Don and Ron cleaned the head and the valves... should have had them look at all the head instead of just that...

What can I do? I guess there is no option but to replace guides. The inner guide seems perfect (I am not sure if there are two guides here, but it seems the inner part is made of a different material than the outside, which looks like a bronze shim).

Also, I notice that my guides are the old style without any groove. So, valve guide seals have to be glued??

Here a few photos:
What could have cause this??:



The two that have the damage:


Why some have two washers and others just one???


New vs old valve guide seals:

Wachuko

I seem to have the first one in this photo...



Workshop seems to call for a two part adhesive. Anybody knows where I can find it? Paragon, do you guys carry it?

"Valve seals must be glued on guides without grooves."

Loctite NF (hardener), Loctite 306 (cement)

Can I use it that way? or no chance, need to replace guides? If the concensus is to replace, I will not need the adhesive since the new guides will most likely be of updated type with groove.

Perry 951

Jamie -

I would have a shop put in new guides and seals. They may want to mill the seats. Seems like someone was in there before and hacked it up with the guide remover tool.

FYI, I had a local shop do it for $100. No need for a big time tuner shop and the high cost. Most shops can do it without problems.

Olli Snellman

[quote]Seems like someone was in there before and hacked it up with the guide remover tool.
<hr></blockquote>

Perry has it.Must have been a real Porsche expert <img src="graemlins/cussing.gif" border="0" alt="[grrrrrrr]" />

Olli
'88 951

Mike B

I had new guides put in my head...$30 from Ian <a href="http://www.ianeuroparts.com" target="_blank">www.ianeuroparts.com</a> (next door to you) and had my machine shop press them in with no problem...

Wachuko

OK, so someone was there before... Now the question is - What else could they have done? I will get new guides and have a machine shop put them in. Thanks!

But what about these washers/spacers:



How many per spring are there supposed to be?? PET does not show quantity...

cruise98

Jamie:

The shims are to adjust the correct installed valve spring height. You will need the special tool or some other means to determine this measurement. It is critical to proper operation of the lifters/valves.

Wachuko

[quote]Originally posted by cruise98:
<strong>Jamie:

The shims are to adjust the correct installed valve spring height. You will need the special tool or some other means to determine this measurement. It is critical to proper operation of the lifters/valves.</strong><hr></blockquote>

Special tool... here we go again... special tool to adjust the belts tension, special tool to pull this and that.... no way out of this I guess...


So I can do the guides in a Machine Shop, but will still have to take it to a shop to get them to install measure and install the shims and springs... good grief...

keith

Just cut and file 4 pieces of metal to the factory workshop max and min specs - 2 for intake, and 2 for exhaust - these are your "special tools" (you may need to borrow a dial indicator to "make" them properly...).

Assemble (in head) valve, one thick shim, one thin shim, spring seat, and then retainer. Put the keepers in and pull the retainer up as if the whole valve assy was installed with the inner and outer spring there (you are mocking it up without the spring). Slip your "gauges" in between the spring seat and the retainer, to simulate measuring the height of the spring. Add or subtract shims as necessary to get in between the 2 "gauges" you made for each valve.

Make sense?

Florida951

Hey I took this to a machine shop!



AND GOT THIS for $100 new valve seals put in, seated valves, cleaned head.


A good machine shop should be able to do it for you

Wachuko

Wow, that looks nice. Is that spray painted?
Wait, Your are here in Orlando!! What machine shop did you use??? Name, address, phone, come on!!

Perry 951

Jamie -

Most shops can shim the springs to be proper height with a dial indicator. Most heads use shims to get the height correct. Since you will need to grind the surface where it is all nicked up, larger shims will be needed to get the proper height and tension.

Again, this is normal procedure for a head rebuld from a shop.