hydraulic lifter adjustment - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 03-25-2003, 02:50 PM
beetle9's Avatar
Last photo:
Join Date: Jan 2002
Location: mich
Posts: 104
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post hydraulic lifter adjustment

just finished a 305, installed a new cam and lifter set. Instructions say bring each cylinder to top dead center, turn pushrod back and forth with two fingers until you can feel a drag and tighten 3/4 turn. These are new (dry) lifters. Is this good advice, or what is your suggestion. I can remember doing this years ago, and just tightened rockers until clatter dissapeared. Advice?

[ March 25, 2003: Message edited by: beetle9 ]</p>

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 03-25-2003, 03:01 PM
willys36@aol.com's Avatar
Hotrodders.com Moderator
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,455
Wiki Edits: 21

Thanks: 6
Thanked 45 Times in 33 Posts

This is the wat to do it whether the lifters are oiled or dry. Basically takes the slack out of the valve train by slightly depressing the lifter spring so nothing ever bottoms out in operation. The 3/4 turn method is just a little more scientific than taking the clatter out by ear but they both do the same thing. Since it is a static adjustment, lifters don't care whether they have oil in them or not.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-25-2003, 07:26 PM
BstMech's Avatar
Join Date: Sep 2002
Location: TN. In the corporate states of America
Age: 44
Posts: 1,552
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts

With the lifters dry, turning them till they stop might depress the plunger before you even go the 3/4 turn past. I always either wiggle the pushrod up and down until the slack is gone or turn them until I feel drag with dry lifters.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-26-2003, 07:01 PM
New Member
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts

The best way that I've found to adjust the lifter "preload" is to go to zero lash and a 1/4 turn. The zero lash part just means to take all the free play, (up and down free play) out. You do this by lifting up and down on the pushrod while adjusting the rocker nut. When all of the free play is gone your at zero lash. Then all you do is go 1/4 turn to preload the lifter. Be sure that the one you are adjusting is all the way down. The reason that I use the 1/4 turn instead of the 1/2 or 3/4 turn is that with the 1/2 or 3/4 turn the valves seem to hang open on me all the time. Hope this helps
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-27-2003, 05:37 AM
V8 S-10's Avatar
Last photo:
Join Date: Feb 2003
Location: Missouri
Age: 40
Posts: 317
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post

1/4 turn seems awful loose...if you're going to run them that loose it would be a good idea to use the lifters with the flat snap ring rather than the type with the round paper clip type snap ring.

Gm manuals all say 1 full turn,but most performance books recommend 1/2 turn.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-28-2003, 04:36 PM
Join Date: Mar 2003
Location: Indiana
Posts: 296
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts

actually it is simpler that you may think. Take them down to zero lash(no slack in pushrod) Then 1 cylinder at a time EXHAUST OPEN SET INTAKE then INTAKE OPEN SET EXHAUST using 1/2 turn from zero. with either one open the other is on the base circle of the cam and 1 cylinder at a time so you don't forget any
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -6. The time now is 07:25 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.