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willysmjeeps.com :: View topic - M38 fuel pump screw torque
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M38 fuel pump screw torque

 
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thomasarnold
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Joined: Jan 26, 2006
Posts: 28
Location: Evans, Georgia

PostPosted: Tue Apr 09, 2019 3:02 pm    Post subject: M38 fuel pump screw torque Reply with quote

Hi! What is the correct mounting torque for the two screws mounting the fuel pump to the engine? OSN G740-73-75385

Thanks
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Thomas G. Arnold
Augusta, Georgia

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dpcd67
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Joined: Nov 25, 2016
Posts: 130
Location: Iowa

PostPosted: Wed Apr 10, 2019 7:19 pm    Post subject: Reply with quote

TM says tighten evenly. I have never torqued a fuel pump; like moat vehicle
attachments, you go by experience and good shop practice.
How tight is tight?
Not sure that a torque can be assigned to such long headed screws anyway.
So, just tighten it to the same tightness as you do for the water pump screws.
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wesk
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Joined: Apr 04, 2005
Posts: 14227
Location: Wisconsin

PostPosted: Wed Apr 10, 2019 9:01 pm    Post subject: Reply with quote

Tom,

The simple rule is whenever the manual fails to specify a torque figure you then determine the grade and size and thread pitch of the fastener, determine if it is being used in a shear or tension mode and apply the appropriate general chart torque. In the case of your bolts which are not an AN, MS, NAS Series it is safe to assume it is a grade 8 or better bolt. Parts book shows 5/16-18NC. Look up standard torque for this bolt size/pitch used in a tension application.

Here's an example chart:

You can view a larger size here: http://willysmjeeps.com/v2/modules/gallery/albums/album326/5_G_002.jpg



Assuming grade 8 and parts list shows it to be zinc plated the torques would be 29 Ft Lbs
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