924Board.org

[Gatornapper]

Ok guys, PBPWM (please be patient with me). I've searched the web and here and can find no answers.

I've adjusted many a set of valves in my over 50 years of wrenching, but have never seen the 924 (Audi engine) set-up.

As the hole in the followers are not fully exposed even with slack and lash, I'm having difficulty finding a tool with which to get to the adjustment screw. My problem is here:

http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/107478-valves-re-tightening.html#post780146

Specifically, "ONE turn on the screw will adjust the valve Up/down 0.05mm.
So I started to turn on one screw, but this was VERY hard, as it seems the screw is "feather" hold in a funny way. As I turned it for a quarter of a turn. the screw turned back to the original location, without me doing any thing
Can any one explain how these screws work?"

As you all well know I'm sure, the opposite end of the screw takes a 3mm Allen wrench - so much easier to turn than a screw.

So I assume the Allen end and the screw end are the same piece? So, loosening the screw (CCW) would be tightening the Allen end (CW)?

Why isn't the use of the Allen end referenced?

And, why, when I try to turn the Allen end, does my wrench seem to want to spring back in anything less than a half turn?

I'd love to see a diagram of how this follower and its adjustment screw are designed.........

All my valves are way too tight and in great need of proper adjustment.

TIA,

GN

[anthonimartini]

https://www.ebay.com/itm/373768355805?epid=4043674964&hash=item5706547fdd:g:K4IAAOSwvrthdvBQ

this is the tool i use for the job. its extremely easy once you figure it out. with the lobe tip facing opposite the lifter rotate the lifter so the hole with the 3mm allen socket faces the intake side then insert you 3mm into the screw. righty to tighten your valves lefty to loosen. there is a .002" +or- so dont fret if you cant get it exact. i shoot for tighter.


if you are using a l shaped allen you wont be able to get a full click without running out of movement so you will have to get it far enough to not spring back so you can remove the wrench and reindex it. i also usually opt for hot adjustments.

CLEAN YOUR OILING TUBE AND REPLACE THE 90 DEGREE PLASTIC ADAPTER!!
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password.

[Gatornapper]

Anthoni -

THANK YOU! Crystal clear now! I have similar tools, but not in 3mm, ordering today. How do others do it w/o this tool? Just ordered it - guess I can't adjust valves until it gets here.......

Now please help me with your closing comment in BOLD.

What/where is "oiling tube" and the "90 deg. adapter" to which you refer?

GN

[Gatornapper]

Anthoni -

Almost everyone else says loose is better than tighter as too tight can burn an exhaust valve.......

Your thoughts are obviously different.......

?????

GN

[Gatornapper]

Anthoni -

I am sometimes dense.

Turn screw CW (clockwise) to tighten valve lash, turn CCW to loosen valve lash.
Correct?

So, as hex end is opposite end of screw, the opposite would be true, correct?

CCW to tighten and CW to loosen?

Thanks,

GN

[924-76]

I would recommend you to buy a Hayes manual to start. They are pretty good for the 924.
If you look online for a picture of the adjustment screw, you will understand why you get this funny feeling when you turn it and why it is hard to turn at first. Beware there are different size/thickness and they are getting hard to find if you run out of adjustment. And if you go too far on the adjustment you risk cracking the cylinder head.

Cheers
_________________
1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP

[anthonimartini]

this is what i referred to. all the camshaft oil get supplied via this little guy and its plastic...

https://www.pelicanparts.com/More_Info/PCG115707.htm?pn=PCG-115-707-OEM&SVSVSI=984&DID=191742

i always replace them whenever i get a new to me car.
as for my preferance on tighter valves, i still adjust within the spec but i just opt for the tighter end of it. it just cuts down on the clatter a bit and i check my valves regularly. sometimes you just get what you get with these adjusters though since they have a finite amount of adjustability. they are a tapered screw with a larger flat side that rest on the valve tip. so you spin them 360 degrees with each turn. imho they are the worst part of 924 ownership as the lifters wear and everything is hard to come by at reasonable prices and to change the screw to a thinner or thicker one requires cam removal which can be extremely annoying especially when building a fresh engine.
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password.

[Gatornapper]

Thanks. I have the Haynes manual and can find no where where it addresses the valve adjustment details. P. 43 - 22 - 24 is very vague.

I do have factory manuals in PDF but have not searched them.

Know what the flat-head screw end and Allen wrench end look like - used mirror on my engine.

GN

[Gatornapper]

Anthoni -

Thanks again. Spent hours going around town this am looking for a 3mm hex on 1/4" drive w/no luck as I expected.

Meanwhile, I figured a way to use an Allen "L" wrench by rotating the follower to swing the wrench enough to get eventually 1 full rotation where it snaps in place.

But now I have another problem. My exhaust valves are at about .012". I rotated allen screw 1 full rotation CW - no change. I returned allen screw back to original position. I now rotated it 1 full rotation CCW. Again, no change in valve clearance. I want to get them close to .016" as I can. I'm not seeing any change in valve clearance rotating screw in either direction.

What is going on now?

Is the same screw Allen on one end and flat slot on the other?

How many full rotations of the screw are safe before going too far?

And one more question: Is this correct? Rotating slot screw CCW increases valve lash by .002" per rotation. CW decreases lash by same.

THUS, on the Allen end, it is the opposite: 1 CW rotation increases lash by .002", CCW decreases it.

Sorry for being such a PITA.....

GN

[924-76]

[Gatornapper]

Ok, I'm getting it. Allen wrench on one end only, indicator notches on other. Found other pics.

Thread is RH only, correct?

Headed back to shop to back out screws some more.......

GN

[Gatornapper]

Guys - thanks for your patience when I was being such a PITA.

What threw me was I initially thought a slot for a flat-head screwdriver was on one end of the adjustment screw and an Allen on the other. Now I get it. When I looked in one of my followers the first time, all I saw was the single slot - like for a flathead screwdriver - and that's what was in a pic on another site.

Actually very simple. If Haynes or anyone else had posted a pic of the screw with the flat portion exposed, like here......



I would have gotten it. It really is so simple. But something I've never seen before.

Even with an "L" Allen wrench, the job is doable tho it may take 30 min. But once I've got the tool Anthoni suggested, it will be a 20 min. job max.

Thanks again for all the help.

GN

[Gatornapper]

Perhaps in the future this might help some:

http://www.914world.com/bbs2/index.php?s=&showtopic=356359&view=findpost&p=2968211

GN