16 replies to this topic

[Ruth's Mini]

can anyone tell me how the trumpet is attached to the cone? is it a threaded fit?

 

I can imagine it's probably seized on there pretty tight after years of pounding. I need to preserve the trumpet, don't really care if I destroy the cone getting them apart.

 

tips, suggestions much appreciated

thanks

 

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[nicklouse]

Plus Gas and then a masonry chisel between the rubber and the alloy.

[Ruth's Mini]

Plus Gas and then a masonry chisel between the rubber and the alloy.

so it not threaded, pressed together?

[alex-95]

 

Plus Gas and then a masonry chisel between the rubber and the alloy.

so it not threaded, pressed together?

 

yep just a good fit.

[imack]

They'll be corroded together, they can be a pig to separate the cone from the trumpet without inadvertently tearing the bonded steel 'cup' out of the rubber cone. As above, plenty of plus gas and a chisel. Once you get a gap between the the steel 'cup' in the cone and the flange of the trumpet the normally lever off relatively easily.

[AeroNotix]

Here's a thread regarding the knuckle joint: http://www.theminifo...-joint-removal/

 

For the cone itself, for when mine wouldn't come off I burned off the majority of the rubber (disgusting, I know, sorry Captain Planet) and it eventually unsiezed. Submerging the whole pow wow in penetration fluid helped. 

 

FWIW I love these threads because it reminds me of the first few months of my own mini ownership. Commiserations because I know exactly how frustrating issues like this can be. Keep at it and don't be tempted to go nuts on it because it's easy to break things you didn't intend by whacking it too hard.

[jomaoliveira79]

This week it happened to me on 1967 mk1 converted to cone suspension... Front cone (Dunlop branded, certainly with over 40 years) was severely atached with trumpet!
Imperial thread compression tool failed due to corrosion on cone thread; also did some wacking on the cone and trumpet with no success.

Solution: multiple trumpet drilling in order to break it and fitted new cone and HiLo.
It's a pain in the ass job; certainly the hardest I did on the car because there is no manual explaining you what to do.

[Rorf]

Why not install hilos with new cones and knuckle then you don't have to do all that hard dirty work

[Ruth's Mini]

Why not install hilos with new cones and knuckle then you don't have to do all that hard dirty work

I'm restoring the car back to original, no modifications.

With Canadian winters it'll mean 5 months storage so will be a low mileage sunny weather driver.

 

thanks to all who responded!

[Ruth's Mini]

here's an update on my original post...

 

No amount of soaking in penetrants, hammering or levering would budge the trumpets and of course heat wasn't an option. After knocking out the knuckle joints I thought maybe a 3 arm gear puller might work. Separated in under a minute!

 

I think these cones are original to the car as they're Imperial thread and quite compressed compared to the replacements.

I couldn't get a 1/2 x 20 NF cap bolt long enough  to thread right thru the top of the cone to the bottom of the trumpet so used 2, one from each end that met midway.

 

here's some pics...

 

regards,

Brian

 

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[imack]

Good thinking, I spent ages separating my cones from my seized front hilos.
The rear hilos weren't seized and I was able to just wind the adjuster anti clock with the allen key until the top of the adjuster pushed the cone off the hilo body.

[whistler]

 

Plus Gas and then a masonry chisel between the rubber and the alloy.

so it not threaded, pressed together?

 

Not threaded. As nicklouse said Plusgas and a chisel. Leave the p;lusgas soak for a day or so first.

[Spider]

Ingenious method.

 

They can be difficult to hammer apart using a Chisel or Masonry Bit as Nick suggested, (but is also how I usually do them) as the Rubber flexes so much is absorbed the Impact of it. If you can support the pair by the Trumpet, I found that works best.

 

When re-assembling, to stop the same happening down the track, if you smear a small lick of grease around the spigot of the Trumpet before assembling, next time they'll just come apart as the weight comes off them.

[Homersimpson]

I've always found an air chisel works wonders to separate these.

[Bobbins]

I've always found an air chisel works wonders to separate these.

But then again an air chisel will separate the whole car if that's what you need!