Rotary valve cover

[Richieskis]

I had bolt drop down carb, damage rotary valve, I already had spire bottom end halves and rotary valve and what I thought was spire cover only to find out my spire must be for a duel carb set up I have single set up 97 GTI here is a picture of my original cover, hope you can see the damage, is that to much or is it still useable ? One more question should the mating surface with the rotary valve be smooth from edge to edge or should there be a slight lip on the very edge of the valve mating surface, thanks in advance for your help

 

[griz400]

it looks ok, sand it lightly with a scotchbrite pad, remove any residue, cause thats what put all those swirl looking marks, like dirt or debris, looks ok the way it is along as there is no debris left on it

 

[Richieskis]

Thanks I will run a scotch bright over it to make sure it is clean, there should be no edge also ?

 

[griz400]

i'm not sure what you mean by an edge on it ???

long as the clearance is within specs

 

[LouDoo]

It looks fine to me, what does the rotary valve gear look like? A lot of time when this happens you'll loose the brass gear on the rotary valve shaft.

Lou

 

[Richieskis]

Well the one I got used off eBay, it has a small ridge on the edge ( circumference ) of the face that the rotary valve rides on, the one that I have pictured is smooth all the way across the face were the rotary valve rides with the exception of the small cuts you see and they are almost smooth.

 

[Richieskis]

It looks fine to me, what does the rotary valve gear look like? A lot of time when this happens you'll loose the brass gear on the rotary valve shaft.

Lou

I have a good used ( spire ) case with good rotary gear on the rotary shaft, I just hope the gear on the crank shaft is ok, I have not pulled the damaged case apart, as I am waiting on the tools to pull the PTO and flywheel

 

[griz400]

as long as when you put it together, your clearance is like .014", now you can check it between the cover and gear with a feeler guage, or lay 2 pieces of solder on rotary valve, torque to specs, take back off and check diameter of solder -- like .010 - .016 is good, or less....

 

[griz400]

if your clearance isnt right, it will probably be hard to start

 

[griz400]

View attachment 20467 this will help you out the rest of the way, i also have a pdf file if you need it to make your own degree wheel and cut it out of paper

http://www.youtube.com/watch?v=ULL5gfQs_UA

 

[Richieskis]

View attachment 20467 this will help you out the rest of the way, i also have a pdf file if you need it to make your own degree wheel and cut it out of paper

http://www.youtube.com/watch?v=ULL5gfQs_UA

thanks, I ordered a degree wheel along with seal kit and PTO removal tool and flywheel removal tools too, I figured I work on these so much and it is never bad to have tools, thanks for the other help I went and reviewed my manual on checking clearance, I guess the clearance between the valve and case is fixed, I am going to pick up 45 degree feeler gauges and some solder

 

[chrisdeamicis]

Well the one I got used off eBay, it has a small ridge on the edge ( circumference ) of the face that the rotary valve rides on,

I just replaced the RV cover on my 97 GTI and it had the ridge you are talking about.
I checked the clearance per the manual and it varied from .022 to .026.
Put the new RV cover on and the clearance was dead on at .012.
Before replacing the RV cover it was next to impossible to get started, now fires up immediately every time.

From what I can tell the ridge is caused by the rotary valve wearing the cover.
I measured the ridge on my old cover and it was right about .012.
Add this to the .012 that the clearance is supposed to be and you get the .024 I was measuring.