The Cap'n's valve adjustment procedure, Jim T and Cap'n Krusty's bestest way! Options

[burton73]

Seeing Cap'n Krusty's name made me smile.

Seeing the Krusty’s name made me smile as well. You newer people never knew him. He had a way with words. He filtered the bull very well.

Best Bob b

[Maltese Falcon]

Seeing Cap'n Krusty's name made me smile.

Seeing the Krusty’s name made me smile as well. You newer people never knew him. He had a way with words. He filtered the bull very well.

Best Bob b

He had a pet peeve against peeps that mentioned California as Cali; so since I'm born, raised & pay them State taxes>>I always mentioned my home roots as Cali in some of his threads !
So how you doin' Bob ¿!

[ctc911ctc]

I will be doing this today - Will advise as to how my modification of the GREAT Krusty's method turns out.

This is a great post! But using it I recently found that is lacking something, you guessed it!

(IMG:style_emoticons/default/thisthreadisworthlesswithoutpics.gif)


First, the tone and character of "Krusty's writing is great, if you have not read this in its entirety it is very entertaining. When I quote Krusty his text is in Blue.

"Here we go! Somebody hold my beer"


After a great deal of background on technique, he provides the engineering reasoning for the method of adjustment.

"I should like to point out that the 914-4 engine is a derivative
of the good old VW engine designed by Dr. Porsche way
back when. As the "people's car" everything, including the
engine, was designed for cheap mass production. As part
of this philosophy, Dr. Porsche reasoned (I take license here)
something like this: "Why should I design a typical 4-cylinder
engine camshaft with 8 lobes, when I can get by with half
that number?" Due to the flat-four layout, each cam
lobe does double duty, actuating a valve first on one side of
the engine, and then on the other."

However, this needs a picture:



Here is the camshaft of a typical 914, your lobes may vary. So now Krusty Explores the simpler method




This then gives rise to a simplified adjustment procedure,
which I have printed up and glued into my Haynes manual
to replace the rather cumbersome procedure in the book.



Removed settings and jack stand advice. **Snip**




It follows logically that a valve opposite one that is open is
on the back of the same cam lobe, the perfect place for
adjustment. It is only necessary to be certain of which
valves actually share the same cam lobe, which can be a
little tricky owing to the offset nature of the cylinder layout.
However, I believe that I have done this and that
further, I have worked it out so that, if the valves are
adjusted in the order given in the table, a minimum amount
of engine rotation will be necessary to complete the task.


What he is saying is Exhaust for Cylinder 1&3 uses the lobe circled.



And, the intake for Cylinder 2&4 uses the following lobe that is circled.




Now- focus on the intake valves for Cylinder 2&4. When the valve in Cylinder 2 is being opened by the lobe it MUST be closed on Cylinder 4. So you can adjust the intake valve on Cylinder 4. VERY CLEAR?

Back to the post, when I read his post originally I got lost in this part:


It is necessary to use the table of valves that I include; note
that in NO case are the two valves that are rocking at the same time
associated with the same cylinder.

Turn until Rocking: Adjust:

#2 Ex & #3 In #4 Ex & #1 In
#1 Ex & #2 In #3 Ex & #4 In
#4 Ex & #1 In #2 Ex & #3 In
#3 Ex & #4 In #1 Ex & #2 In






The chart is the same as the text above it.

NOW THIS IS WHERE IT GOT VERY CONFUSING FOR ME.

The original explanation promises that this is a method that one person could perform. However, in the chart, I was mystified as to why I have to look for 2 valves rocking on opposite sides of the car?????? Example: 2 AND 3, etc.

I imagined (prior to thinking about this) that there was a position where #2 Ex and #3 In may not be in sync. This is not the case. THEY CAN NEVER BE OUT OF SYNC since the lobes are 180Deg out of phase.

This is where the Sun rose above my marble head.

The logic in the chart is wrong! This is the correct Logic:

Turn until Rocking: Adjust:

#2 Ex OR #3 In #4 Ex & #1 In
#1 Ex OR #2 In #3 Ex & #4 In
#4 Ex OR #1 In #2 Ex & #3 In
#3 Ex OR #4 In #1 Ex & #2 In

There is no case where #2 Ex is rocking and #4 Ex & #1 In are NOT Seated.

Now this begins to make sense, I could do this from one side of the car for 6 of the 8 valves and then need to move to the other side for 2 of the 8 valves


Please make suggestions, I will take the suggestions and then post a cleaner version with better charts, etc.