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Discussion Starter · #1 ·
The time has come to replace my wheel hub assemblies. The Land Rover manual says to use STC 50554 sealant on the driveshaft splines on reassembly. Apparently an equivalent of this sealant is Loctite 648 retaining compound. My concern is removing the hubs in the future. It sounds like Loctite 648 is almost considered permenant, requiring high heat and a press for disassembly.

Anyone ever used Loctite 648 on their hub splines and then later taken it back off? Any thoughts on this issue?
 

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It's the proper equivalent to the OEM number. It is what it is and does what it does because it was designed to do that. If it came apart easily it couldn't do its job. If you have to disassemble in the future, it just takes some heat- less than 500 degrees. That's propane torch, not glowing metal. No press needed. At that temp it's got zero bond strength.
 

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The time has come to replace my wheel hub assemblies..... The Land Rover manual says to use STC 50554 sealant on the driveshaft splines on reassembly. Apparently an equivalent of this sealant is Loctite 648 retaining compound. ....
RAVE says to use Loctite 640 though, which if you check it's data sheet it's better for that purpose than 648
 

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640 works the same, but has a shorter cure time, which is good. Same yield temp to remove parts. I think 640 also has a tighter requirement on part cleanliness as well.

After a couple experiences with RAVE, I no longer take anything it says as the gospel truth. If something doesn't exactly sound right, I usually will look at other sources to confirm.

IMO- either will work, as will other products. You shouldn't be concerned about disassembly.
 

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shoot.. i never put anything on them, i just hit them with the impact gun and move on.

rear hubs i add rtv to the rubber gasket.
 

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Visit a truck shop sometime. Some of the fastener torque specs are over 1,000 ft/lbs.

How do you do it? A big torque wrench. And "get some assistance" means enlisting someone to pull on that big SOB wrench while you're getting beers.
 

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Discussion Starter · #9 ·
Here is the info I found in the RAVE and service bulletins.The bulletins indicate to use 648 (as opposed to 640. Also I wonder why the torque specs in the two attached documents is do different (360 ft/lbs in RAVE vs. 250 ft/lbs in the bulletin)?

Bulletin N o : 0001
CDS. ref: L8431bu
Range Rover
Discovery Series II Issue: 2
Date: 26.04.2000
AFFECTED RANGE:
All Range Rover up to VIN: YA 434637 YA 435750
All Discovery II (System 2) up to VIN: Introduced at Job 1 YA 260194
All Discovery II (System 1) in VIN range: Introduced at XA 900000 to XA
907212


PROBLEM:
CLICKING NOISE FROM REAR AXLE
When pulling away from rest in either direction, a clicking noise may be
heard from
the rear of the vehicle.
CAUSE:
Excessive spline movement on either:
a) The rear axle shaft to hub spline, (Range Rover).
b) The rear differential flange to pinion spline, (Range Rover and Discovery
II).
ACTION:
At the above VINs, the application of Loctite to the above spline locations
was
introduced during manufacture.
· In case of customer complaint on a vehicle within the affected range,
apply Loctite
648 to the axle shaft or pinion spline as detailed below.
NOTE: Loctite 640, previously specified on Issue I of this bulletin, has
been
cancelled for use on vehicles in service due to its extended cure time.
· When reassembling rear hubs or rear diff flanges for any other reason,
regardless
of VIN, apply Loctite 648 to splines as detailed below.
 

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