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Old 04 December 2007, 12:50   #21
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I knew I had something missing in my life. You wont believe it, but i've been using my fingers all these years!
Agreed but those Infrared thermometers are great - got mine from Maplin. So many uses - checking exhaust pipes - engine blocks - the woodburner flue - all sorts of things - the fridge - the cat's arse(definitely not fingers)...........
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Old 04 December 2007, 13:10   #22
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the cat's arse(definitely not fingers)...........
You git. You just gave me an image that made me spray coffee at the screen....
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Old 04 December 2007, 13:27   #23
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That works, up until you get a bearing that is failing. Then you can't check again until your fingers heal.

jky
OK, in my experience , the no.1 thing that cooks the hub is the brakes binding. This is an issue with bearing buddies, savers etc, as it boils the grease and causes it to blow out through the pressiure relief holes. If you're in a binding situation you really wont need a gadget to let you know. Practically all of the five senses will be clued in to the fact. If, on the other hand the bearings are so shot that they are getting hot, they'll also be rumbling like billiow.
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Old 04 December 2007, 13:37   #24
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on the other hand the bearings are so shot that they are getting hot, they'll also be rumbling like billiow.
Have to agree with Mr mollers on that one.
Last time I had a bearing on the way out (on a non braked trailer) it sounded horrible through the tow bar and wasn't even that bad yet.

I think the shot bearings allow enough movement for the brakes to rub, which makes everything worse.

I have one of the infra red temp guns that I've used for all sorts of things, including balancing multi-cylinder bike engines by equalizing the temperature of the header pipes. And it makes taking the kids temperature a bit of fun when they are feeling ill.

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Old 04 December 2007, 14:04   #25
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Have to agree with Mr mollers on that one.
Last time I had a bearing on the way out (on a non braked trailer) it sounded horrible through the tow bar and wasn't even that bad yet.

I think the shot bearings allow enough movement for the brakes to rub, which makes everything worse.

I have one of the infra red temp guns that I've used for all sorts of things, including balancing multi-cylinder bike engines by equalizing the temperature of the header pipes. And it makes taking the kids temperature a bit of fun when they are feeling ill.

Nasher.
Have you tried it on a cat - they get pretty hot...........
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Old 04 December 2007, 14:06   #26
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Have to agree with Mr mollers on that one.
Last time I had a bearing on the way out (on a non braked trailer) it sounded horrible through the tow bar and wasn't even that bad yet.

I think the shot bearings allow enough movement for the brakes to rub, which makes everything worse.

I have one of the infra red temp guns that I've used for all sorts of things, including balancing multi-cylinder bike engines by equalizing the temperature of the header pipes. And it makes taking the kids temperature a bit of fun when they are feeling ill.

Nasher.
Iam with Mollers too , you can hear and feel bearing going and if the hub is hot it smells if unsure spit on it .jack it up and spin the wheel It will feel rough long before it gets hot or sounds bad on the road .

Nasher
How the hell do you balance carbs with a heat detector ??
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Old 04 December 2007, 17:38   #27
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OK, in my experience , the no.1 thing that cooks the hub is the brakes binding. This is an issue with bearing buddies, savers etc, as it boils the grease and causes it to blow out through the pressiure relief holes.
Could very well be. But it's not the only cause, and is much more lokely to happen to a disk brake-equipped trailer than a drum equipped one.


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If you're in a binding situation you really wont need a gadget to let you know. Practically all of the five senses will be clued in to the fact. If, on the other hand the bearings are so shot that they are getting hot, they'll also be rumbling like billiow.
Not necessarily true. Water in the grease will decrease it's lubricity, and heat will develop. The friction of the rollers grinding will generate heat long before the bearings fail and your wheel goes careening into the weeds. Insufficient grease will also cause a period of overheat before failure. Any warning is better than a sudden failure.

Don't know about your trailer, but I can run over the Bott's Dots (the little raised lane marker thingies) and not feel it in the truck. I suspect I'd never feel a bearing going, either.

jky
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Old 04 December 2007, 17:46   #28
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Could very well be. But it's not the only cause, and is much more lokely to happen to a disk brake-equipped trailer than a drum equipped one.




Not necessarily true. Water in the grease will decrease it's lubricity, and heat will develop. The friction of the rollers grinding will generate heat long before the bearings fail and your wheel goes careening into the weeds. Insufficient grease will also cause a period of overheat before failure. Any warning is better than a sudden failure.

Don't know about your trailer, but I can run over the Bott's Dots (the little raised lane marker thingies) and not feel it in the truck. I suspect I'd never feel a bearing going, either.

jky
Disks??!! You're going to tell me that trailer wheels in the US aren't made of wood next!
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Old 04 December 2007, 18:54   #29
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Jky - are you suggesting that you can get a very early warning of an impending bearing failure by measuring running temp, and watching for a change of a few degrees, rather than waiting for a temperature change that is obvious to the hand (or eye)...

I certainly had a previous (unbraked) trailer where there was a noticeable temperature difference between the two hubs after towing for a while - the off side hub was hot but not unbearable to touch (50-60 C?) - the near side was warm (40-45 C?). IIRC the bearings were repacked/greased after that rather than replaced as there wasn't any movement or significant wear. They then seemed to be equal temps for the rest of the season (and then she was sold). Perhaps I was lucky? Perhaps I spotted it early? Perhaps there wasn't really a problem and it was just facing the sun or something?

Is your point not that if it is too hot to touch or smoking you should have spotted it earlier before it became "critical"?
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Old 04 December 2007, 19:10   #30
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Because when the air/fuel ratio is the same the header pipes run at the same temperature. Quite accurate really

Its obviously easier with Bikes cos they have 4 seperate header pipes rather than a manifild

Nasher
I have this sort of ogri cartoon vision in my head of you wheeling a superbike out of the garage warming it up then pointing your thermometer at the wheels and exhausts etc , not touching a thing and zooming off down the road .
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