M38 Tie-rod Clamp Bolts
Posted: Thu Sep 12, 2019 10:02 pm
I'm getting ready to replace the busted rubber grease boots on my tie-rods and happen to notice the bolts for the end clamps look original and a bit thin with pitting. Might as well change them while I'm at it.
So.....as is my habit (thanks Wes!) before I touch a wrench I review the TM to make sure I understand what's involved, and to try and determine if the stuff I'm about to handle matches what the ORD9 and Reference Guide says about it.
My September 1955 ORD9, page 263, says these four bolts (1 per clamp) are 7/16-20NFx1-7/8 and 85,000 psi yield. Ord part number 181673. Doesn't compute. I look again at the bolts on my clamps. No way they're that big 7/16. They're actually 5/16-24NFx1-3/4. And 1-3/4 length leaves a good 1/2-inch plus of threads hanging out there past the nut for no apparent reason.
Unless I missed something huge, it looks like there's a mistake in the ORD9? OMG
The M38 Reference Guide appears to repeat the error.
I bought four new Grade 8, 5/16-24NFx1-1/4 bolts, nuts, and locks to install. And as much as I'd like to use the factory grease seals and springs instead of $2 rubber boots ---- it'll have to wait until next time I service them and save some more coinage.
Just a thought......maybe we could use a sticky thread to discuss and post TM pen changes of any kind in one place for easy reach? I mark up my manuals when I stumble on them in the forums and they appear to be proved true (Wes' good housekeeping seal of approval), but I'm pretty sure I don't have them all.
So.....as is my habit (thanks Wes!) before I touch a wrench I review the TM to make sure I understand what's involved, and to try and determine if the stuff I'm about to handle matches what the ORD9 and Reference Guide says about it.
My September 1955 ORD9, page 263, says these four bolts (1 per clamp) are 7/16-20NFx1-7/8 and 85,000 psi yield. Ord part number 181673. Doesn't compute. I look again at the bolts on my clamps. No way they're that big 7/16. They're actually 5/16-24NFx1-3/4. And 1-3/4 length leaves a good 1/2-inch plus of threads hanging out there past the nut for no apparent reason.
Unless I missed something huge, it looks like there's a mistake in the ORD9? OMG
I bought four new Grade 8, 5/16-24NFx1-1/4 bolts, nuts, and locks to install. And as much as I'd like to use the factory grease seals and springs instead of $2 rubber boots ---- it'll have to wait until next time I service them and save some more coinage.
Just a thought......maybe we could use a sticky thread to discuss and post TM pen changes of any kind in one place for easy reach? I mark up my manuals when I stumble on them in the forums and they appear to be proved true (Wes' good housekeeping seal of approval), but I'm pretty sure I don't have them all.