Welcome to the North American Subaru Impreza Owners Club Saturday August 18, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Custom Fabrication, Welding & Tools

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 07-14-2018, 06:51 PM   #1
albersondh
Scooby Newbie
 
Member#: 196882
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Holset baller on a budget.
Vehicle:
08 WRX

Default Lifter bucket grinder?

I need to remove some material from one piece lifter buckets to set lash. My lash changed about .001 after lapping and Im on the tight side now.

I want to use a mill and cutter, end mill, grinding bit, whatever, to take off some material. I can see some guys use dremil bits on a drill press but Im hoping to find something a bit more reliable in tems of straight/square. Im thinking a thicker shank (Dremil is 1/8) and maybe a fine stone? Ideas for a bit to get this done and leave a decent finish?
* Registered users of the site do not see these ads.
albersondh is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-14-2018, 07:22 PM   #2
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Surface grinder with a magnetic base/table, very small cuts. Maybe run a green wheel (normally used for carbide).

Everything else is.....well.....ghetto....
Granted, other methods can work, you REALLY want a smooth flat finish. Otherwise, you can wipe out a cam lobe, then, you start all over.......for many valves......

I am not a machinist, I'm a decent "metal hacker". I have a few years working on my own and in shops.
I know when to "MacGuyver" and when to do it right.
Charlie-III is offline   Reply With Quote
Old 07-14-2018, 09:51 PM   #3
n2oiroc
Scooby Specialist
 
Member#: 141952
Join Date: Feb 2007
Chapter/Region: MWSOC
Location: milwaukee'ish
Vehicle:
18 golf arrrr!

Default

Quote:
Originally Posted by Charlie-III View Post
Surface grinder with a magnetic base/table, very small cuts. Maybe run a green wheel (normally used for carbide).

Everything else is.....well.....ghetto....
Granted, other methods can work, you REALLY want a smooth flat finish. Otherwise, you can wipe out a cam lobe, then, you start all over.......for many valves......

I am not a machinist, I'm a decent "metal hacker". I have a few years working on my own and in shops.
I know when to "MacGuyver" and when to do it right.
id think you would grind the underside where it touches the valve stem.
n2oiroc is online now   Reply With Quote
Old 07-15-2018, 12:24 AM   #4
albersondh
Scooby Newbie
 
Member#: 196882
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Holset baller on a budget.
Vehicle:
08 WRX

Default

Quote:
Originally Posted by n2oiroc View Post
id think you would grind the underside where it touches the valve stem.
Yes. I wouldn't touch the surface that laps to the cam. Pretty sure it is not flat to promote lifter spin. Im referring to removing material from the nub that contacts the valve stem.
albersondh is offline   Reply With Quote
Old 07-15-2018, 01:29 AM   #5
Subie_
Scooby Specialist
 
Member#: 419354
Join Date: Apr 2015
Chapter/Region: MAIC
Location: Delaware
Vehicle:
2007 STI
Crystal gray metallic

Default

Quote:
Originally Posted by albersondh View Post
Yes. I wouldn't touch the surface that laps to the cam. Pretty sure it is not flat to promote lifter spin. Im referring to removing material from the nub that contacts the valve stem.
Is there another bucket you can swap it with and still have both within spec?
You can always just order the correct size... they're only $15-$20.
Subie_ is offline   Reply With Quote
Old 07-15-2018, 08:34 AM   #6
albersondh
Scooby Newbie
 
Member#: 196882
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Holset baller on a budget.
Vehicle:
08 WRX

Default

Quote:
Originally Posted by Subie_ View Post
Is there another bucket you can swap it with and still have both within spec?
You can always just order the correct size... they're only $15-$20.

I want the capability without having to tip valves or buy new.
albersondh is offline   Reply With Quote
Old 07-15-2018, 04:50 PM   #7
Elbert Bass
Scooby Specialist
 
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

Default

I have seen folks grind the valve stem tip, but never the bucket - that is some hard material there...
Elbert Bass is offline   Reply With Quote
Old 07-15-2018, 07:56 PM   #8
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Quote:
Originally Posted by n2oiroc View Post
id think you would grind the underside where it touches the valve stem.
Quote:
Originally Posted by albersondh View Post
Yes. I wouldn't touch the surface that laps to the cam. Pretty sure it is not flat to promote lifter spin. Im referring to removing material from the nub that contacts the valve stem.
Yes. Issue sorta is.....

Suitable stone (green for carbide is best), keeping surface flat, etc. limited room to work.
If you hack at it, likely less than flat surface which will change gaps with little wear.
Also, grinding heats the material, thus harder to measure, reset, then grind more.

Quote:
Originally Posted by Subie_ View Post
Is there another bucket you can swap it with and still have both within spec?
You can always just order the correct size... they're only $15-$20.
Depends on the system, some are about $17ea, some are closer to $60. Look them up on Subaru.partsonline.com or similar.

Checking gaps on a bench is one thing, checking when the head is torqued to a block may be another.

Doing something on a weekend when no new parts are around is one thing, doing something that lasts for 50K+ miles is another.

Not saying you can't hand grind within a bucket to get a gap, just really hard to do right.
Charlie-III is offline   Reply With Quote
Old 08-08-2018, 09:46 PM   #9
CarbideCarGuy
Scooby Newbie
 
Member#: 489895
Join Date: Aug 2018
Chapter/Region: Tri-State
Location: North New Jersey
Vehicle:
2005 STi
PSM

Default

I thought about this myself and I think the best way is order a new bucket.
The second best way is to keep lapping it.
And the quickest way to take off a bunch of material is on a lathe with a really rigid setup and a carbide tip. Indicate it straight withing a few tenths and take a pass a few tenths shy of where you need to be.
I would only use this method if you're taking material off the inside of the bucket. That being said, i don't know if there's any geometry inside of the bucket on the boss tip. you could run an indicator on the boss to find out if its concave, convex or flat.
CarbideCarGuy is offline   Reply With Quote
Old 08-10-2018, 05:59 PM   #10
rtv900
Scooby Specialist
 
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

Default

Quote:
Originally Posted by CarbideCarGuy View Post
And the quickest way to take off a bunch of material is on a lathe with a really rigid setup and a carbide tip. Indicate it straight withing a few tenths and take a pass a few tenths shy of where you need to be.
.
indicate it within a few tenths and then take a pass a FEW TENTHS shy of where you want to finish?

I'm guessing you've never done anything like that on a lathe.
rtv900 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 05:53 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.