1993 3L80 Transmission Filter Change (bolt loose to filter) Correct or not?

[dskupi01]

I went to change the filter on my 1993 AM General M998 Humvee HMMWV. Opened pan,
and filter was loose. I've done other GM transmission oil changes (4l60 I
think). For them, the filter was press fit into the pump with no
bolt.

Looking at the bolt, (see attached pics) it appears too long. I
assume the bolt should moderately clamp the filter to the underside of the
valve body. As it is now, there's play. Correct? Anyone
do a recent change? Is the bolt for assembly only & remains loose after torquing, and the bottom of the
pan holds the filter in location?

Part 13 in second pic. Shoulder is 1 5/16" and overall length is 2 3/8". Bolt is NLA from GM, or I would just buy a new one. Option B, junkyard, but I wanted to ask here first.

Also, planning on using Dextron 6.

Thanks for the help.

 

[NormB]

TM 9-2320-280-20-2 pages 5-2 to 5-6.

 

[Wire Fox]

And as for the part, I checked all the sources I know of and couldn't find it, but I can at least link you to a page that has the technical specs of the bolt. If you needed to replace, you might be able to take this to a fastener supply house and they can get you a compatible bolt. http://www.parttarget.com/5306-01-1...8&searchoption=sku&originalsearchtext=8633208

 

[dilvoy]

Does the hole in the pickup/filter have an enlongated hole to allow it to float up and down along the thick shank of this bolt that you are speaking of?

 

[mudsharkangler]

FWIW, I just did a 3L80 transmission service...exact same thing.

 

[Cobra38]

Just did mine a few weeks ago and the bolt tightened up before the filter got tight.

 

[dskupi01]

Thanks. I was a little concerned. Less now. Everyone's reply helped. I will measure and reply. Roughly, looks correct. Hole is elongated with shoulder fitting in elongated hole.

 

[dskupi01]

Bolt and spacer right. Thanks again,

 

[NormB]

FYI: Check parts book 24P-1 (or 2), search for short part number or NSN.

NSN-Now.com search here;

http://nsn-now.com/Indexing/PublicSearch.aspx

Looks like they're available, just not "the usual places." GM part shown too.

Glad you got it worked out.

 

[dskupi01]

Thanks. Like the site for finding nsn parts.

 

[Duster06]

Thanks guys. I just did the exact same thing and was concerned. I'm curious now as to the rational behind designing the filter to be lose while the bolt is tight. My only thoughts are that the manufacturing engineer was worried that if you could tighten the filter, you would torque the plastic suction tube and break it.

 

[NormB]

Thanks guys. I just did the exact same thing and was concerned. I'm curious now as to the rational behind designing the filter to be lose while the bolt is tight. My only thoughts are that the manufacturing engineer was worried that if you could tighten the filter, you would torque the plastic suction tube and break it.

I don't understand engineers. Hung out with some as an undergrad. Mostly EECS types, but some mechanical and bioengineering types. I - and my friends in the bio sciences - thought they were absolute "grinds," found out they held similar opinions of us in the pre-med fields (chem-bio), but they don't seem to think like real people.

As evidence, I present MS-DOS and the PC computer. Plus this one HMMWV "issue," among many others.

QED.

I had exactly the same question when I changed my filter.

WTF?

NOTHING in the manual states "WTFO" much less a more informative "by the way, YES, the filter WILL be loose on the retaining bolt, it was designed that way for reasons mankind and Skippy the motor pool monkey just weren't meant to know. Don't worry about it, just torque to spec., finish this job, go get a grape soda and sneak another Kool cigarette while Top's not watching."

There was never - to my knowledge - a PS magazine update cartoon with Connie Rod talking about floppy filters either.

But this seemed to be a common enough concern it was fairly easy to find references to it on this website so I could move on to buttoning everything up and refilling the transmission.