Re: Tubeless Tyre issues Dear all - in my opinion, there are two "correct" ways and one "not-preferred" way of repairing punctures in tubeless tires. The two correct ways are as follows: 1. Install a mushroom bung from inside the tire: to do so, it is necessary to remove the tire from the wheel rim, remove the foreign object from the tire, cut a hole of minimum diameter through the tire carcass either by using a very small drill or a thin hand held taper reamer, roughen the inner surface of the tire to increase the friction between the tire and bung to allow the bung to adhere perfectly, choose the correct diameter bung suitable for the application, apply air-drying sealant to the interface of the bung with the tire, insert the bung guide through the carcass till the bung sits concentric with the hole, pull the bung guide through the carcass and hold it for around 1 minute to allow the initial seal to form, let the assembly cure for around 10 minutes (means leave it alone), pull the bung guide again, keep it pulled and at the same time apply a little air drying sealant to the shaft of the bung guide which is protruding from the tire, let it cure for around 10 minutes and then cut the bung guide. Assemble the tire on the wheel rim in such a way so as to ensure that the affected section is the intital portion of the tire going on the wheel rim, so as not to unduly stress this section which happens when the last bit overrides the rim and goes in place. Fill air in the tire upto 80% of the normal tire pressure which should be sufficient to ensure that the bead has located concentric to the wheel rim, remove the air and fill it again exactly upto the recommended tire pressure. Check the pressure with a digital gage and cross-check with another digital gage to eliminate gage error. Balance if required, it is not compulsory to do so if the removed and mounted orientation is the same. Mount the wheel assembly on the car, lower the jack, let the tire take the load of the un-laden car, check for any increase in the projection of the bung outside the tire periphery due to the load on it now and cut-off any small projection, check tire pressure again with the tire on the road, it will be approximately 1psi less than that checked on the assembly machine. Fill the tire to the recommended tire pressure. Check tire pressure and correct in 3 other tires also, without fail. The whole thing takes around 1 hour to do, operator attitude and motivation are very important to do this properly, otherwise it will not get done properly. Cost should be around 300 rupees. 2. Vulcanize the tire in this area: I shall give the details shortly.
Obviously the "non-preferred" way is to have the thread inserted from outside, sticking out of the tire. I am not comfortable with it.
Best regards,
Behram Dhabhar
Last edited by DHABHAR.BEHRAM : 15th July 2016 at 11:46.
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