Welcome to the North American Subaru Impreza Owners Club Friday April 18, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 11-13-2012, 05:55 PM   #1
redblack
Scooby Newbie
 
Member#: 96866
Join Date: Sep 2005
Default Adjusting valve lash during HG replacement

Hello

I was wondering if it is better to adjust the valve lash with the heads bolted to the engine or if it's alright to do them off the car? I have searched but i only see threads on adjusting them with the timing belt on.

thanks
* Registered users of the site do not see these ads.
redblack is offline   Reply With Quote
Old 11-13-2012, 06:30 PM   #2
cal_look_zero
Scooby Specialist
 
Member#: 294461
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Grass Pants, OR
Vehicle:
1997 Outback Sport
Acadia Green Metallic

Default

Do it with the heads on the car. You have to be able to rotate the engine and keep the cams stationary while you do it.
cal_look_zero is offline   Reply With Quote
Old 11-13-2012, 07:31 PM   #3
subaru-tech
Scooby Newbie
 
Member#: 335402
Join Date: Oct 2012
Location: Drums pa
Default

Its definately better to do it with the heads installed
subaru-tech is offline   Reply With Quote
Old 11-13-2012, 07:38 PM   #4
05-rsx
Scooby Specialist
 
Member#: 101188
Join Date: Nov 2005
Location: Melbourne, Australia
Vehicle:
MY07 WRX Wagon
Black

Default

I did it with the heads off the car whilst doing HG replacement. Reinstalled them and was getting irritating valvetrain noise (sewing machine style).

After a month it got the better of me and I rechecked tolerances - nearly every valve was out (loose), presumably from torquing down the heads.

Lesson learnt - do it once the heads are installed and torqued down.
05-rsx is offline   Reply With Quote
Old 11-20-2012, 02:47 PM   #5
Patrick Olsen
NASIOC Supporter
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

Default

I'm having a hard time visualizing why it would make any difference. Can anyone spell it out for me?

I ask because I have a set of DOHC heads and cams sitting in my garage and was planning to measure lash and get the valves tipped as necessary. But if my methodology wouldn't give me valid results then I'll have to figure something else out.

Thanks,
Pat Olsen

Last edited by Patrick Olsen; 11-20-2012 at 03:02 PM.
Patrick Olsen is offline   Reply With Quote
Old 11-21-2012, 02:30 PM   #6
Bacon117
Scooby Specialist
 
Member#: 118500
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: Michigan
Vehicle:
02 Silver Wagon
"Stage 2"

Default

Quote:
Originally Posted by Patrick Olsen View Post
I'm having a hard time visualizing why it would make any difference. Can anyone spell it out for me?

I ask because I have a set of DOHC heads and cams sitting in my garage and was planning to measure lash and get the valves tipped as necessary. But if my methodology wouldn't give me valid results then I'll have to figure something else out.

Thanks,
Pat Olsen
It's easier to hold/rotate the cams as needed when everything is installed. I've never done the wrx, but that's been my experience on other cars/bikes.
Bacon117 is offline   Reply With Quote
Old 11-21-2012, 11:58 PM   #7
oem
Scooby Newbie
 
Member#: 330
Join Date: Sep 1999
Location: Ca
Default

It is ideal to set the lash with the heads on the engine but it is not necessary.

The heads will distort after they are torqued to the short block but it will not effect your valve lash by much

Just screw in a cam bolt, without the cam gear, into the cam and use a wrench to turn the cam.
oem is offline   Reply With Quote
Old 11-27-2012, 02:05 AM   #8
Charlie-III
Scooby Specialist
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: 07456, North NJ
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper Wagon

Default

I've done lash type & shim type on the bench, no issues. The heads & cams are so short, no real distortion when torqued up (unless the heads/block are warped).

I believe Subaru suggests to set the clearance when the engine (heads) are ~75*F. Hotter or colder may make a slight difference.
Charlie-III is offline   Reply With Quote
Old 11-27-2012, 10:19 AM   #9
Patrick Olsen
NASIOC Supporter
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

Default

Thanks. I was talking to Ken @ Delta Cam yesterday about something else and asked him the same question. Ken said the same thing you did - unless the heads are warped, torquing them down should not measurably affect the valve lash.
Patrick Olsen 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 09:35 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.