Timing Belt Cover Repair


Information and questions on GL1500 Goldwings (1988-2000)
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Elmobile
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Timing Belt Cover Repair

Post by Elmobile »



One of the 3 nut for the cover to the timing wheel on the cover for the timing belt is loose.
Do we know if this cover is made out of ABS. If that is the case I could rebuilt it with an ABS slurry...




If not is there any glue which would keep the nut in place?



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minimac
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Re: Timing Belt Cover Repair

Post by minimac »

Just some good old JBWeld.

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CrystalPistol
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Re: Timing Belt Cover Repair

Post by CrystalPistol »

I don't know about the timing belt cover on the 1500, never had cause to look other than I know it's not metal and that it's black. Usually, looking closely, if I'm in doubt, I've found "ABS" cast in the piece someplace though.
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Re: Timing Belt Cover Repair

Post by MikeB »

I use a couple of ABS repair products. They are called called Plastex https://www.plastex.net/ and Plastaid https://www.plast-aid.com/. The solvent that comes with them can be used to test the plastic you intend to work on. I'm not sure what the solvent is but it may me Methyl Ethyl Ketone (MEK). Anyway, if you put some of this solvent on the plastic and the plastic starts to become tacky to the touch, the plastic repair product will work for that plastic.

These products have worked very well for me on all my ABS repair work. It is strong and fast drying, unlike normal ABS glues.
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Re: Timing Belt Cover Repair

Post by Solo So Long »

Curious, I just checked Fleabay. Looks like a nice selection of timing covers for less than $20.

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Re: Timing Belt Cover Repair

Post by WingAdmin »

Yes it is ABS, and yes an ABS slurry will fix this, better than J-B Weld and Plastex.

The problem with using J-B Weld and Plastex to repair ABS is threefold: They are both much, much harder and stiffer than ABS, they expand and contract with heat at different rates than ABS, and they adhere to ABS - they don't bond WITH it. When the ABS expands or bends, the J-B Weld and Plastex don't, and the bond eventually breaks, so the repair will fail. Same goes for people attempting to use fiberglass and/or resin to repair ABS, for the same reasons.

When you make a repair to ABS using ABS slurry and cement/MEK, it chemically melts the ABS into one contiguous new piece, that can be as strong (or stronger!) than the original piece. It bends and expands exactly the same as the original piece, because it's ABS. And, because it chemically bonds to the original piece, it can't come apart due to a failure of the adhesive bond like non-ABS repairs can.

All that said - I have repaired problems like this before using a soldering gun. I heat the brass insert until the ABS surrounding it gets very soft, then move it around to reseat it into place, then let it cool.

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Elmobile
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Re: Timing Belt Cover Repair

Post by Elmobile »

Thank you WingAdmin to confirm that the material is ABS. I get to this repair once I get my carbs issues resolved. See my post "Timing wheel".
I will use an ABS slurry and post pictures once done...

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Elmobile
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Re: Timing Belt Cover Repair

Post by Elmobile »

Repair done.
Not the best looking but should do the job...


What is a good recipe for ABS slurry? I just chopped an old piece of plumbing pipe in plumbing cement. While it is good enough for this repair, I would need something finer for some of the body parts...
Any suggestion?

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Re: Timing Belt Cover Repair

Post by WingAdmin »

Elmobile wrote:
Wed Apr 15, 2020 12:05 pm
What is a good recipe for ABS slurry? I just chopped an old piece of plumbing pipe in plumbing cement. While it is good enough for this repair, I would need something finer for some of the body parts...
Any suggestion?
That's exactly what I use. I add a bit of MEK to thin it out as required. I will typically drill holes in the ABS and use the drillings to melt, as they are quite fine and have lots of surface area, so they melt completely.

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Elmobile
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Re: Timing Belt Cover Repair

Post by Elmobile »

Thank you, I make note of it. Acetone would be good for thinning, would it?

My next winter project will be to remove and repair all the body parts in needs of attention. I will remove a bunch of chrome bars which means that I will have to close a fair number of holes... I was reading with a lot of attention the thread about "Painting the 1500". While the result is impressive, it is a lot of work...
I am contemplating doing some wrapping instead. Other than the lid for the trunk, It seems to be a reasonable project.

Has anyone attempted this process yet on a 1500?



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