DIY casting (rubber, silicone, cement, polyurethane etc casting)

[440bbm]

that would be my pic. make it the same shape as the arm hole not the rubber replacement, with a nominal amount of squish in all measurements. 

[Hyperblade]

11 hours ago, kws said:

Bringing this back from the dead as casting my own bushes might be the only way to get bushes for my rear axle reaction arm since they are long NLA. Has anyone had a go in the last 5 or so years?

I would want to cast them in a similar hardness to rubber, since it does need to flex and not be so rigid it breaks the arm (apparently a risk). The stock bushes are a weirdo shape, typically. The attached photo is what I need to replicate, and I could probably cast it in place in the arm if I needed, using some 3d printed moulds.

Just to give you another option.

You might be able to just 3d print it direct in TPU.

Tricky thing is probably getting the stiffness dialed in, which could be done via amount of infill or TPU type (probably better in this case for strength).

Here's a steering rack bush i did in TPU 95a.

[ThePog]

I printed some shore 90 TPU bushes for someone on here, as far as I know they work fine. Hardness is more like poly than rubber obvs

[kws]

Problem with poly and similar hardness is allegedly because the bushes need to twist when the axle moves, if they are too stiff the cast alloy arm can actually break, and like the OE bushes, it's also long since NLA.

It'd be easy if the inside of the hole where the bushes go was perfectly round, but it at least has the two flats inside it and i suspect it tapers in at the middle too, although I havent removed my bushes yet to check. I won't be modifying the arm to fit anything different. 

[ThePog]

Yea I way prefer rubber over poly, the materials compliance is why it is used.

Having said that I would still use a printed part if it the real one was difficult to find...

[tortron]

https://lep.co.nz/shop/industrial-plastics-rod-sheet-tube/rods/lurethane-rod/

 

can get any duro rating you like of this stuff, (again if you wanted to machine it)

[smokin'joe]

thread dredge....... again.

as this is a foreign material to me, and part is NLA (even aftermarket), is there anyone capable/wanting/desperate for cash to have a go at replacing the rubber with a form of polyurethane to repair this mount ?  unsure if it would need casting or does it just need a 2-piece bushing of correct hardness/elasticity........ cannot even find a 2-piece bush in a similar usable size in the Nolathane book

[NickJ]

One of these with an ecentric adapter to locate? Bore is 10mm, 60mm OD

https://ladapower.com/catalog/transfer-case-2/lada-niva-transfer-case-mounting-oem-detail

[smokin'joe]

18 minutes ago, NickJ said:

One of these with an ecentric adapter to locate? Bore is 10mm, 60mm OD

https://ladapower.com/catalog/transfer-case-2/lada-niva-transfer-case-mounting-oem-detail

whatever way i rungi it up, gotta be tidy as WOF guy knows they unobtainium..... they also tried for a customer 6-9 months ago.
must say, did they copy these off the rear engine mount from and Imp ?
https://ladapower.com/catalog/transfer-case-2/lada-niva-transfer-case-bracket-detail

[NickJ]

What are they from originally? Lada pretty much copied everyone that had suspect ideas

[smokin'joe]

1 hour ago, NickJ said:

What are they from originally? Lada pretty much copied everyone that had suspect ideas

looks like rear engine mount from Hillman Imp

 

[kws]

looks like its the trans mount for a 100 series Hi-Ace. A quick google shows a 200 series hi-ace mount might work?

https://cartune.co.jp/notes/5TcC2wXkxG

I believe its this one, but double check before ordering anything https://www.amayama.com/en/part/toyota/1238030030

[smokin'joe]

8 hours ago, kws said:

looks like its the trans mount for a 100 series Hi-Ace. A quick google shows a 200 series hi-ace mount might work?

https://cartune.co.jp/notes/5TcC2wXkxG

I believe its this one, but double check before ordering anything https://www.amayama.com/en/part/toyota/1238030030

kzh116 4wd. mount was only in the 4wd up to 2004.
reads like 12380 is only the bore diameter that is different

[Bearded Baldy]

What od is the bush section?

2 piece voided diff mount bushes from falcon/subaru/etc could be a go.

[smokin'joe]

1 hour ago, Bearded Baldy said:

What od is the bush section?

2 piece voided diff mount bushes from falcon/subaru/etc could be a go.

ended up using a common Honda control arm bush as nothing available in NZ (even though genuine stupid cheap) and added 6mm spacer to each side to centre it.
found a metric sh1ttonne of stuff that fitted, but nothing in NZ