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Fitting ploy bushes


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I guess the Triumph engineers had an idea why they made the dust covers with some more effort like they are...

But there cannot be a problem as long as you not turn the steering wheel fully right or left, so stay your day in the garden, please.

Edited by Z320
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Thanks Marco, I suspect it would be OK, but mentally I can’t know about something incorrect and not sort it out, it’s like OCD. Anyway, I prefer garages to gardens, any excuse!

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OK, here are some photos, some are new from items from my scrap boxes, others are from 2011 and 2012.

First of all you have to know this for the TR4A - TR6 construction:

the castled nut has to be locked on the bolt to have one metall unit with the trunnion,

so the distancers are fixed between the hardened washers and slide in 2 x 2 nylon bushes.

Therefore the dimensions of all parts have to be in small ranges,

no rust or paint has to be IM the wishones (bore 7/8") and not too much paint on them where the dust covers are in contact.

P1170037-b.JPG.46b4c2195324005d3e090dd782b464c8.JPG

The white and black items are nylon bushes, as I use them (not the Superflex items) on my TR4A.

Their diameter is about 22.3 mm, this is to fit 7/8" with a slightly tight fit, the flange is about 1.7 - 1.9 mm, the distancer is about 30 mm.

P1170040-b.JPG.8e8fa8a7c1a9af34011f2d5a4dadc531.JPG

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The nylon bushes slightly pressed in the wishbones with the dust covers, then the distancer,

the distancer must be about a minimum longer and they have to be moveable with some reasonabel power.

P1120855c.JPG.0125815402916e9bf7f0c80bf73a4672.JPG

In the little plastic bag left on top of the first photo you see 4 distancers from a english supplier, they are 29.6 mm long - and with this lenght too short.

Their anser about my complaint: "We sell them since ages and never had any problem". Well.....

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On both sides of the distancer there has to be a washer (and the seal) made of hardened steel, right side of the first photo,

next a test with a old one. If you force them - they must brake.

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The delivered new ones from 2012 have been of mild steel, this cannot hold the forces from the steel distancers.

If you force them - they bend. Probably they did not tell the Chinese folks all specifications.

P1120811-c.JPG.6b71d1159536cade908002e8e9b42719.JPG

Next you see my old trunnions, left an original one with damages, probably a previous owner thought the bolt is a nail and uses a hammer.

You better not give the forces of the distancer direct on the trunnion, it is too soft. Use the hardened steel washer!

Right already a old replica, you see how deep it is countersunk, there is no surface at all to base the distancers on!

P1170050-b.JPG.b481d8e741f6c9502692c7de53b592da.JPG

This are the PU-inserts / parts from Superflex from 2012, the diameter about 0.3 mm too big.

You can press them in the wishbones but you will have problems to get the spacers in with a reasonable power!

P1170045-b.JPG.434ef28ced741798e554f69b9614d169.JPG

The flange is about 1 mm too solid, while the disancer has the correct lenght of 30 mm, so the spacers are too short for the PU-inserts.

So I was not able to lock all metall parts together to on unit with the castled nut, and the distancers did not slide in the PU inserts.

P1170046-b.JPG.9e7a192b27f929552d7fb6a5e1f61d12.JPG

P1170047-b.JPG.f7755ad26b8832c6649c9414da858bb5.JPG

This simply does not fit at all, so I used new standard nylon inserts. This was an expencive experiense....

But with the Superfelx order also came the PU bushes for the other end of wishbones.

They are LOVELY with the "slotted" surface, this keeps some of the silicon grease in while with the left one all grease is wiped away.

P1140692c.JPG.f360cb46ff4b23af5d3afa63f86c94e9.JPG

Now you know all about and I hope to spend this time and expalin makes sence - and I'm not only the annoying German.

Ciao, Marco

as usual: because of limited data memory at this forum I sadly have to delete all 13 photos very soon again

 

 

Edited by Z320
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Hello Marco,

Super !!!
I've been talking my mouth linty for years.
But one is not believed.
Always buy the parts for the swivel bearings individually (Rimmer), only then are there hardened black disks.
The man in the video doesn't know what he's doing. It's just botch!

Ralf

Edited by Schnippel
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Marco, all sorted this morning, bolts directionally correct and hardened steel washers x 4 on each LW/ trunnion. It was fiddly and took some time, but I feel happier knowing all is as per spec. Thank you for sharing your knowledge. 

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Michael

Put the car on Jack stands, remove wheel, then trolley jack under the shocker and take up sufficient play in the spring to move the lower wishbones into line with the trunnion and then ‘juggle’ the trunnion until everything lined up.  Simply tap the bolt through very carefully, torque up and split pin.  It was fiddly but pretty straightforward. I also managed to get the inner washer in place.

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Hi Marco,

excellent explanation. You get a like, a hug and a heart fr this effort!

Gruesse,

Waldi

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  • 5 months later...

Seasons greetings. 

Having spent these tough times reviewing threads on trunnion kits and installation, it appears that it might be a challenge to source a good kit with SS sleeves, good washers square O-rings and accurately dimensioned nylon bearings etc.

Given the content of this thread, can anyone recommend a good source who might offer the best kit to use.  I have looked at Revingtons, Rimmers, TRShop, TRF, BPNW et al but nothing stands out in the descriptions to give confidence as to dimensional accuracy relative to OEM specs

Cheers,

Alf

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