hot problem no 2

[Dignity]

Coming home today I checked the hubs and tyres as I normally do and although the hubs were cold 2 of the tyres were quite warm. The trailer is a tandem axle with brakes on the front axle. The tyre that was hot on the left side was the front one with the brake drum yet on the right side it was the rear tyre without the brake. Checked the air pressure just now after several hours and they are all at 32 lbs so am perplexed what could be causing this. They are LT type tyres and about 2 years ago had changed one as it had a big bubble form on the sidewall. Wondering if these are going the same way.


sam

[gone_fishing]

if the hubs werent to hot
and tyre pressures are the same it sounds like a load distribution issue between the axles from side to side
depending on how hot is hot its not a real concern just note that those tyres getting hot are bearing a greater load than the other wheel on the same side as your boat rocks on the trailer whilst traveling
personal i dont really know how you could rectify with out a bit of trail and error
usally tyres get hot due to flex so try runnning those tryes at a slightly higher pressure

[Kleyny]

OK.
when you said you had to buy a new tyre because one got a bubble are they the same brand. If so are they known brand.

How long does your rig sit in the same spot??? If it sits idle for some time there will be allot of load on the side walls at the bottom of the tyre. this will weaken the tyres side walls to the point of causing defects on the inside. unusual heat and bubbles are both symptoms.

This sitting for too long is also no good for your bearings. (can leave inprints in outer race and flatspots on the needles.

IMHO i think you need to replace those tyres ASAP.

The way to combat the problem in the future would be to use you rig more or jack the trailer up so your axles/tyres are dangling and spin them every now and again.

hope this help

neil

[FNQCairns]

Sam that's a riddle to be sure! consider increasing the two warm tyres by 2 psi cold But really you need to do cold pressure an all tyres then check again well into the trip, the tyres with the biggest change in PSI will need a bit more air, in your case it's a fair guess it will the ones that are getting warm.

Forgot what PSI the pressure increase cold to hot is considered OK.

Everything is an individual today - getting hard to keep up!!

cheers fnq

[gone_fishing]

just somthing i though of
are the trye the same brand and size
also tread depth a larger diamiter tyre in in one corner will cause this
try a experiment and rotate your tyres front to back see if the prob stays on the same spots or follows the tyres

[Dignity]

gone_fishing, not sure that on a 20' boat the distribution of weight is such that the opposing tyres would get hot. Thought about what I had in there for the trip home anf there was an empty esky and the reef pick on the port side which was the only extra weight. The cooler tyres were luke warm after a 2 hour run but the other 2 would have been twice the temp.

Neil, going fishing more often sounds like the best solution, will have to check with work and see if they agree . Will look at putting the trailer on jacks while not in use. All 4 tyres are the same size and brand - Dunlop Highway 6.5 x 13 LT.
Will keep and eye on themfor now but will get an extra spare in the meantime.



sam

[Dignity]

Sam that's a riddle to be sure! consider increasing the two warm tyres by 2 psi cold But really you need to do cold pressure an all tyres then check again well into the trip, the tyres with the biggest change in PSI will need a bit more air, in your case it's a fair guess it will the ones that are getting warm.

Forgot what PSI the pressure increase cold to hot is considered OK.

Everything is an individual today - getting hard to keep up!!

cheers fnq

fnq, the tyres were cold when I checked the pressures late this afternoon but will do a progressive check on my next trip which unfortunately won't be till June sometime as I am heading to Fraser for the comp in about 10 days time and have put put a water tank into my mothers this coming weekend.

[Sea-Dog]

Is the trailer running straight?

No broken welds anywhere on "A" frame or spring mounts?



Imagine if one of the sides was allowed to slip backwards a little.
I'd imagine that the forward tyre of the leading side and the rear tyre of the trailing side would bear the most stress, and heat up accordingly.



Or................ dunno

[Kleyny]

An after thought on my theory with the weight taken off try pushing your sidewalls. You should have a constant feel all the way around on both sides. if you have a soft spot the tyre could be RS.

I would take all the tyres down to a reputable tyre dealer to get them to check them out.
I couldn't think of anything worse than going on a big fishing trip and blow out a tyre that could have been prevented.

Only my thoughts

neil

[Dignity]

sea dog, will check the alignment during the week. Forgot that I did do some adjustments a couple of months ago but it was ok then, maybe there has been some movement

sam

[Dignity]

An after thought on my theory with the weight taken off try pushing your sidewalls. You should have a constant feel all the way around on both sides. if you have a soft spot the tyre could be RS.

I would take all the tyres down to a reputable tyre dealer to get them to check them out.
I couldn't think of anything worse than going on a big fishing trip and blow out a tyre that could have been prevented.

Only my thoughts

neil

same here - wouldn't consider the tyre too hot but the difference in temps had me thinking as previously they used to all run about the same

[BM]

Light truck tyres are usually rated up to 60psi. Check the rating on the sidewalls. 32 psi is way too low for a light truck tyre. If it has a 60psi max I would put them to at least 50psi.

The bubble in the sidewall was most likely an impact fracture. These are caused by hitting an object with the sidewall (typically a gutter will do it). The impact fractures the nylon cords in the sidewall and then the tyre bulges as its only the rubber retaining the pressure within. Kind of like a hernia really.

Take some quick measurements from the frame to the axles to check that your axles are parallel and you aren't crabbing and check the loading inside your boat.

Cheers

[Dignity]

BM - have checked everything out and is Ok except there may have been a bit more load on the port side but it wouldn't have been more than 20kg in a 2 tonne boat. Will increase the tyre presuure and try that.