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MG TD TF 1500 - Worn Splines and Loctite 680

In 2014 the following was posted:

Posted 25 June 2014 at 14:52:43 UK time
R L Schapel, South Australia, Australia

If your rear wheels knock because of worn splines, use "Loctite 680" on the rear tapers (which have been well cleaned with thinners or similar). When tightening the knockoff, turn the wheel rearwards against the splines. Hammer the knockoffs on tight! Give the Loctite time to set before driving the car. Don't get Loctite anywhere but the rear taper! Wheels fitted in this way come off normally when required although once I had to kick the tyre to break the Loctite. Before refitting, scrape off old Loctite.

Does anyone have experience with Loctite 680 in this application? I am concerned with getting the wheels off after using it because the Spec Sheets for this compound do describe it as an adhesive.
Ron Coates

RL Schapel clarifies in the archive posts that he thinks this might be appropriate for minor "clunk" of still good wheel/hub splines, and to help keep them from getting any worse off. See archives (Loctite 680). I would worry about the Loctite ripping away at the surface of the splines-- when the two surfaces are separated from each other. Similar to the damage done sometimes to threads on disassembly, when too strong a Loctite was used. But no, never tried it.
D mckellar

It is not put on the splines, only the tapers.
Ron Coates

Correct. Do NOT put it on the splines! ONLY the hub taper. (Not the knockoff taper.) If you put it on the splines I reckon you would need oxy acetylene to get the wheel off! I would not describe Loctite as an adhesive but an "anti-slipping" agent.

R L (Bob) Schapel
R L Schapel

A diagram Bob has from the original discussion, showing the area (taper) in question. Interesting.

D mckellar

It is very important to let Locktite 680 cure properly.
I have been using on my machine projects for some years,
Works great.
See attached charts.

Jim B.

JA Benjamin

If the wheels are knocking even with the spinner tight, then there is a problem. Greasing the tapers and beating the heck out of the spinners is a good way to distort the wheel hub, and it will then be at risk of coming loose and/or rapidly wearing the splines. Very light grease on the splines and nothing on the tapers. Hammer nice and snug but don't keep bashing once it's already tight.
Steve Simmons

I guess I am still not getting an answer that alleviates my concern. In Bob Schapel's reply he says to put it only on the hub taper not the knockoff taper. By knockoff taper do you mean wheel taper? The instructions for Loctite 680 say to put it on both parts. Did you apply it with a brush?

Also, you mentioned having to kick the tire sometimes to remove the wheel. Which way did you kick it? How difficult was it to break the 'seal'? Was it easy to scrape it off before putting the wheel back on? Thanks for any input.
Ron Coates

You can put the Loctite on the hub AND wheel-centre surface if you like. (Each labelled "Taper" in D McKellar's image.) When you put the wheel on, these two surfaces come together anyway. You could use a brush but I just apply it directly from the squeeze bottle. Enough to spread over the surface when the wheel is fitted but not enough to run off into the splines.

By Knockoff taper (where you DON'T put Loctite) I mean the inside of the chromed "spinner" and the taper on the outside of the wheel-centre that it contacts. These (and the splines) should be greased so that the spinner is lubricated and can be hammered on tightly ... and later hammered off if you need to change a wheel.

On the rare occasion when you need to kick the tyre to break the wheel free, just remove the spinner and kick the side of the tyre. It will come loose easily, as long as you have not put Loctite on the splines. Cured Loctite scrapes off easily with a scraper or screwdriver as it is not a conventional glue ..... Jim's chart mentions the "sheer strength" which Loctite is designed for.

Bob Schapel
R L Schapel

Thanks for the info Bob
Ron Coates

This thread was discussed between 07/01/2017 and 09/01/2017

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