Ford 300 Inline 6 valve train problem - 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-12-2012, 04:43 PM
Augusto's Avatar
From the middle of the world
 
Last wiki edit: How to rebuild an engine Last photo:
Join Date: Mar 2006
Location: Ecuador, South America
Age: 51
Posts: 1,312
Wiki Edits: 6

Thanks: 4
Thanked 2 Times in 2 Posts
Ford 300 Inline 6 valve train problem

I'm having low compression and vaccum reading issues due to the valve train not seating well,

I've made a compression test and it indicates valves not sealing well, I just lapped them so the seats are not the problem.

I belive they are kept open by the lifters.

Is it possible to convert them to adjustable, like the chevy engines?

Can I use chevy rocker arms in them? I6 or V8 pieces?

What is the rocker arm ratio of the I6 Ford engine?

thanks a lot.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-12-2012, 05:23 PM
BOBCRMAN@aol.com's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,130
Wiki Edits: 0

Thanks: 25
Thanked 267 Times in 250 Posts
You did not state the year of your engine. Early 300 six engines use guided cast rockers that can be lashed. Similar to the 289-302 early rockers.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-12-2012, 07:36 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,822
Wiki Edits: 0

Thanks: 4
Thanked 449 Times in 384 Posts
Quote:
Originally Posted by Augusto View Post
I'm having low compression and vaccum reading issues due to the valve train not seating well,

I've made a compression test and it indicates valves not sealing well, I just lapped them so the seats are not the problem.

I belive they are kept open by the lifters.

Is it possible to convert them to adjustable, like the chevy engines?

Can I use chevy rocker arms in them? I6 or V8 pieces?

What is the rocker arm ratio of the I6 Ford engine?

thanks a lot.
I'm not to sure that lapping if that's all you did will be adaquate, especially if this is a heavy duty or an emissions head with hardended seats.

So that leads me to the question as to whether you used a seat cutter/ grinder before lapping? Lapping alone as a seat restoration process makes the seats too wide and the valve ends up not settling well on the seat. Also, did you restore/replace the guides. When these get loose the valve rather orbits the seat having a hard time setting itself down.

Bogie
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-12-2012, 07:54 PM
Augusto's Avatar
From the middle of the world
 
Last wiki edit: How to rebuild an engine Last photo:
Join Date: Mar 2006
Location: Ecuador, South America
Age: 51
Posts: 1,312
Wiki Edits: 6

Thanks: 4
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by BOBCRMAN@aol.com View Post
You did not state the year of your engine. Early 300 six engines use guided cast rockers that can be lashed. Similar to the 289-302 early rockers.
it's a 1987 engine, came out of a E350 Econoline, it's installed now in my son's Granada.

I don't know about the early 289-302 rockers, this is my first time I deal with Ford engines.

the rockers are cast not stamped like the chevy units.

you mean there's a way to adjust them valves? shims or something?

the truth is I would love having a chevy-like system, adjustable by turning them loose 'til they make noise then tigthen down 1/2 turn, you know what I mean right?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-12-2012, 07:58 PM
Augusto's Avatar
From the middle of the world
 
Last wiki edit: How to rebuild an engine Last photo:
Join Date: Mar 2006
Location: Ecuador, South America
Age: 51
Posts: 1,312
Wiki Edits: 6

Thanks: 4
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by oldbogie View Post
I'm not to sure that lapping if that's all you did will be adaquate, especially if this is a heavy duty or an emissions head with hardended seats.

So that leads me to the question as to whether you used a seat cutter/ grinder before lapping? Lapping alone as a seat restoration process makes the seats too wide and the valve ends up not settling well on the seat. Also, did you restore/replace the guides. When these get loose the valve rather orbits the seat having a hard time setting itself down.

Bogie
I just lapped them to clean up the grime, the engine sat down for several years, the seats and valves are ok, not worn, so are the guides, they didn't need a restoration, the engine has low millage, they are not too wide now, I lapped them not to correct any problem, just a clean up job.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-12-2012, 08:43 PM
BOBCRMAN@aol.com's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,130
Wiki Edits: 0

Thanks: 25
Thanked 267 Times in 250 Posts
Early ( late sixty-early seventy) 300 use a crimped nut, similar to chevy. That can be used with the guided cast rockers. These adjust just like a chevy.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-13-2012, 06:49 AM
Augusto's Avatar
From the middle of the world
 
Last wiki edit: How to rebuild an engine Last photo:
Join Date: Mar 2006
Location: Ecuador, South America
Age: 51
Posts: 1,312
Wiki Edits: 6

Thanks: 4
Thanked 2 Times in 2 Posts
the nut just bottoms out and can't be adjusted any further, do I need longer push rods or do I have to machine down the head bosses or the rockers?
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need info on a 300 inline 6 Ford bowtieorbust Hotrodding Basics 37 06-09-2011 12:33 AM
Ford Inline 6 300 ( most miles ? ) crystalbluevib Engine 4 03-02-2010 01:37 PM
300 inline six ford steve stearsman Engine 5 12-23-2008 02:47 PM
1983 ford inline 300 robmccolery Engine 4 02-04-2007 05:36 AM
removing valve springs on inline ford 300 vistastudio Engine 1 10-09-2002 07:24 PM


All times are GMT -6. The time now is 06:39 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.