Am refreshing transmission extension housing FIPG, shaft and yoke seals.

The shop manual recommends replacing the extension housing hardware..
Attached are images of original transmission extension housing bolts. Two of 90119-10232 and four of 90119-10233.
The original factory bolts have yellow material (threadlock?)
The uniformity of the applied "yellow" material suggests it was applied by bolt supplier.

It feels somewhat pliable...

However, the replacement bolts do not have the coating.
Can anyone identify the yellow material.
Thanks

 

Yes it looks like threadlock to me too, maybe walk into your local lexus dealership and talk to them as it's possible oem bolts had this material out of the factory at this time apparently unless these are aftermarket bolts and were changed out some point thereafter.
Wish I had more info off the top of my head keep posted on your findings.

 

$45 seems like a lot for an ordinary non shielded bearing. I know you didn't necessarily mention it in the OP. Are you replacing it as well...?

 

I've noticed yellow threadlocker on my '91 in a few places. Most recently (that I can remember) was on the drive belt tensioner pulley. So in your case, I'd just use whatever the appropriate threadlocker is (red, possibly high temp) = Permatex 27200 or Loctite 272.

 

Am familiar with Loctite "Red" and "Blue"threadlock.

The yellow compound is something else

The original bolts had uniformly applied yellow compound suggesting it was applied by the bolt manufacturer.

Toyota is informing the Dealer that threadlock was not used or necessary...

They commented without looking at above images

Replacement fasteners did not come with said compound.

Appreciate input specifically identifying the yellow compound.

Thanks

New Toyota fastener on left without yellow compound. As a steel bolt is screwing into Aluminum (transmission housing) may preclude use of certain threadlocking compounds...

 

It is a low mileage transmission (30k) and am freshening up external seals, o-rings and FIPG before installation.

The bearing appears like new so am not replacing

 

The transmission extension housing is affixed to the transmission housing with 6 bolts.
The 4 top bolts are longer, and two lower are shorter.

The longer bolts employ a grip (unthreaded area on shank) while the shorter bolts do not.
Am opposed to using bolts without a grip into a through hole of an affixed part...the threads tend to cut into Aluminum castings.

Determined the grip length of the 4 longer OEM bolts are slightly less than through hole length in extension housing holes using two shorter bolts.
Have ordered two longer OEM bolts and will cut to fit.
Still a fair amount of tolerance between housing through holes and shank of fasteners, but wasn't going to expend additional time and resources fabricating precision shoulder bolts for this application.

 

It's a nylon locking compound applied by the fastener manufacturer. "Nypatch" was a what we used to call it. Although this is a proprietary term.

https://www.ruland.com/technical-res...-screw-coating

 

Acquired two more of longer upper housing bolts with grip and had them shortened.

Original lower housing bolt at bottom and shortened bolt with gril in middle. Not a fan of bolts without a grip used in through holed Aluminum casting.


Lower transmission extension housing bolt
Grip does not bottom out...