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07-26-2018, 12:16 PM | #1 |
Scooby Newbie
Member#: 395708
Join Date: Jul 2014
Chapter/Region:
BAIC
Location: Suffolk County, NY
Vehicle:2008 WRX Hatch Silver |
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?
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07-27-2018, 10:38 AM | #2 |
Scooby Newbie
Member#: 376219
Join Date: Dec 2013
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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.
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07-27-2018, 10:59 AM | #3 | |
Former Vendor
Member#: 93646
Join Date: Aug 2005
Chapter/Region:
MWSOC
Vehicle:Many Track Records Let us help you go fast! |
Quote:
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. |
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07-27-2018, 11:28 AM | #4 |
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 |
Ill be the third to hop in and agree with the statements above.
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07-27-2018, 01:37 PM | #5 |
Scooby Newbie
Member#: 395708
Join Date: Jul 2014
Chapter/Region:
BAIC
Location: Suffolk County, NY
Vehicle:2008 WRX Hatch Silver |
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 ;-)
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