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-   -   whats the normal clearance between valve guide and stem for the OEM 930 wastegate? (http://forums.pelicanparts.com/911-engine-rebuilding-forum/738968-whats-normal-clearance-between-valve-guide-stem-oem-930-wastegate.html)

fredmeister 03-14-2013 10:26 AM

whats the normal clearance between valve guide and stem for the OEM 930 wastegate?
 
This is a turbo specific part but thought guys on this forum might know the answer to this question:

What is considered a normal clearance between the valve stem and the valve guide bore for an OEM 930 turbo wastegate?
I can here air blowing past the valve guide and into the exhaust port when I pressure test the wastegate housing. I realize a small amount of air will inevitably pass thru the clearance gap bewtween the 2 parts, but when is it time to replace the valve guide from wear? I have not been able to find a spec on this yet. Would like this info in order to be able to machine a new guide and have it pressed into the housing if need be.

Air leaking past the guide is air lost to opening the wastegate valve so ideally this should be a minimum.

Appreciate any info,
Fred

ivanuf 04-21-2017 04:25 PM

Anyone has some answers to this old post?

racing97 04-21-2017 06:25 PM

I would assume it would be no more that a exhaust valve guide which is .0022 thou

regards

Steve@Rennsport 04-24-2017 04:23 PM

Quote:

Originally Posted by racing97 (Post 9560139)
I would assume it would be no more that an exhaust valve guide which is .0022 thou

regards

Exhaust valve guide clearance should never exceed .007".

.022" is FAR too much.

racing97 04-25-2017 10:04 AM

.0022 is two thousands and two tenths a little less than .007 aye....

regards

reclino 04-27-2017 09:18 AM

I did a quick search of the forum. Came up with this.
http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/748196-overboost-problem-solved.html


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