Welcome to the North American Subaru Impreza Owners Club Tuesday March 19, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 07-26-2018, 12:16 PM   #1
rlew21
Scooby Newbie
 
Member#: 395708
Join Date: Jul 2014
Chapter/Region: BAIC
Location: Suffolk County, NY
Vehicle:
2008 WRX Hatch
Silver

Default replacing valve guides

i already checked out this thread: https://forums.nasioc.com/forums/sho....php?t=2828200


hopefully the more experienced out there can chime in. I need to relace the valve guides on my version 8 ej207 heads (doing a hybrid build). Now I'm wondering if I should follow the method mentioned with heating the heads, freezing the guides and picking up a cheap valve guide driver that i could use with my air chisel (I'd use a pressure regulator and give it just enough PSI to get the guides in) OR should I leave it to an experienced machinist who can make sure that it's in straight/true to the valve seats?

Also a machinist in the area said that he could show me how to use his valve grinding stones to do a multi angle valve job. He has the old school tools that use the guide to line up the stones, would that wear out the guides before I even have a chance to put the valves in it? I also might be able to chuck it up on the bridgeport at his shop.

tldr: should i install my own valve guides or leave it to the pros?
* Registered users of the site do not see these ads.
rlew21 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-27-2018, 10:38 AM   #2
Barney145
Scooby Newbie
 
Member#: 376219
Join Date: Dec 2013
Default

No, absolutely do not attempt this yourself. There are so many ways to get it wrong. Even experienced "old school" machine shops shouldn't go near late model multi valve heads with 6mm and smaller stems with their heavy ass stone type seat grinders. The seats should be machined using appropriate modern equipment. But only after the guides are installed correctly and sized accurately, preferably finished to size with a valve guide hone.
Barney145 is offline   Reply With Quote
Old 07-27-2018, 10:59 AM   #3
Turn in Concepts
Former Vendor
 
Member#: 93646
Join Date: Aug 2005
Chapter/Region: MWSOC
Vehicle:
Many Track Records
Let us help you go fast!

Default

Quote:
Originally Posted by Barney145 View Post
No, absolutely do not attempt this yourself. There are so many ways to get it wrong. Even experienced "old school" machine shops shouldn't go near late model multi valve heads with 6mm and smaller stems with their heavy ass stone type seat grinders. The seats should be machined using appropriate modern equipment. But only after the guides are installed correctly and sized accurately, preferably finished to size with a valve guide hone.
This man very much speaks the truth.

Additionally, if you replace the guides you WILL have to get the seats cut. No matter how careful you are driving and reaming guides they will never ever be the exact same as what came out. Even the smallest deviation will lead to a leak.

Bottom line, if you need to do guides then you're doing a whole refresh.
Turn in Concepts is offline   Reply With Quote
Old 07-27-2018, 11:28 AM   #4
rexworx
Scooby Guru
 
Member#: 103232
Join Date: Dec 2005
Chapter/Region: Tri-State
Location: GTX3576R 05GD, GTX3076R'd FXT
Vehicle:
GTX 3071R'd 11WRX
PPG,4.44,LSD,E85,6spdx3

Default

Ill be the third to hop in and agree with the statements above.
rexworx is offline   Reply With Quote
Old 07-27-2018, 01:37 PM   #5
rlew21
Scooby Newbie
 
Member#: 395708
Join Date: Jul 2014
Chapter/Region: BAIC
Location: Suffolk County, NY
Vehicle:
2008 WRX Hatch
Silver

Default

Good to know! Looks like I'll be reusing the valves, keeping the guides in and replacing the seals for now until I have a chance to take the car off the road again next summer and get a proper valve job done with undercut stems and all that fancy stuff. Gotta love being a broke college student ;-)
rlew21 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 03:21 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.