View previous topic :: View next topic |
Author |
Message |
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
Posted: Fri Sep 29, 2017 11:10 am Post subject: Correct pressure plate bolts |
|
|
Ok.
My bolts are takeouts.
They are 5/16NC x 1-1/16" with a 3/8" long shoulder.
I just received a package of new bolts from one of our suppliers.
They are 5/16NC x 7/8" with a 3/16" long shoulder.
The manuals show WO-630129 matches my takeouts.
Has anyone else run into this discrepancy?
Do I send these back and try and order Ford 1" long sccews?
What a mess. I may never get this thing back together.... _________________ Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16241 Location: Wisconsin
|
Posted: Fri Sep 29, 2017 12:54 pm Post subject: |
|
|
Shank left with washer on the bolt is not the important issue. The most important issue is overall length. You have a required engagement length of the threads that must be met. It must engage all the threads in the flywheel.This should be the main driving force in your search. Grip length, if a consideration, will equal the combined un-threaded thickness of the parts that will be joined. You will be best off with grade 8 bolts of the proper dimensions with at least a rating of -2 on close dimensional tolerance. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
Posted: Fri Sep 29, 2017 8:45 pm Post subject: |
|
|
So,
The Ord 9 G503 shows all the same numbers
as the G740, with the addition of a Ford part number.
Length is 1-1/4" as opposed to the 1-1/16" listed
in both the Ord 9 G740 and Ord 9 G758.
No superseded parts or dimensions other than the
1-1/4" to 1-1/16" from 1946 through the 1955 G740
and the G758 shown on our website.
Does anyone know if the dimension was reduced
further to .77 and have the documentation?
Thanks, _________________ Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16241 Location: Wisconsin
|
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16241 Location: Wisconsin
|
Posted: Fri Sep 29, 2017 9:45 pm Post subject: |
|
|
Quote: | How can they go from a 1-1/4" to 3/4" long bolt and still use
all the threads in the flywheel? |
Obviously they screwed up on the new bolt selection they are selling you.
This is one of those issues you simply do the math yourself and buy what the math dictates. I don't have a flywheel and pressure plate sitting here tonight but I can explain what needs to be done:
1-measure the depth of the threaded portion of the hole in the flywheel.
This will dictate the threaded length of your new bolt.
2- with the press plate tight against the flywheel use a depth gauge to determine the distance from the top edge of the pressure plate to the beginning of the first thread in the flywheel. Add to that distance the measured thickness of your lock washer.
This will dictate the maximum length of shank or grip length you need.
3-Select a grade 8 bolt with a -2 dimension tolerance and buy them. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16241 Location: Wisconsin
|
Posted: Sat Sep 30, 2017 10:50 am Post subject: |
|
|
We all have a depth gauge!
You take anything even a 12 penny nail can be a depth gauge. You stick it in the hole and draw a line on it then take it out of the hole and measure the tip to your line with a ruler.
The most important dimension will be the shank / grip length. It must NOT hit the threads in the flywheel. With the lock washer installed and tightened flat the shank must end in the pressure plate housing and not in the flywheel hole. If you do make sure of this the shank can bottom out against the first threads in the flywheel and give you a false sense of torque.
Dial calip can use it's tail rod as a depth gauge,
Depth Micrometer is mad for the job
Standard micrometer. Not much use in measuring depth. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
Last edited by wesk on Sun Oct 01, 2017 3:58 pm; edited 7 times in total |
|
Back to top |
|
|
Kendall Member
Joined: Feb 25, 2006 Posts: 344 Location: Wichita, KS
|
Posted: Sat Sep 30, 2017 5:07 pm Post subject: |
|
|
"I do not have a depth gauge but will do the best I can."
Do you not have a micrometer? I had overlooked the depth gauge of a micrometer until working with a machinist on another project. The "tail" portion of the micrometer is your depth gauge (depending upon the type of micrometer you are using).
Kendall _________________ 1951 M38
1952 M38
1952 M38A1
1942 Dodge WC-55
1951 M100 trailer
1942 Ben Hur trailer |
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
GPA Member
Joined: Aug 07, 2008 Posts: 216 Location: Hungary
|
Posted: Sun Oct 01, 2017 2:18 pm Post subject: |
|
|
Kendall wrote: | "I do not have a depth gauge but will do the best I can."
Do you not have a micrometer? I had overlooked the depth gauge of a micrometer until working with a machinist on another project. The "tail" portion of the micrometer is your depth gauge (depending upon the type of micrometer you are using).
Kendall |
There are micrometers made to measure depth, but the ordinary micrometer is not one of them.
The tool with the "tail portion" to measure depth is called a slide caliper. _________________ 1960 M38A1, M100 Trailer |
|
Back to top |
|
|
4x4M38 Member
Joined: May 30, 2014 Posts: 3444 Location: Texas Hill Country
|
|
Back to top |
|
|
|