Re: The Big Fat Panda - Story of our Hyundai Creta SX+ Petrol Investigating a slow leak.
So the Panda had developed a slow leak in the rear right tyre for past few weeks.
Initially it was observed when I was dusting her and took her to a nearby fuel pup for a top up. I was not concerned much because when I got it inflated, the machine started from 29psi instead of the 31 in all other tyres.
However, the a couple of weeks later, I observed that the same tyre was sitting lower than the other one on the left. Took her again to the pump and this time the machine started from around 28 psi whereas for the other tyres it started from 32 psi. The same routine repeated the next week also. So, I was sure it was a slow leak, maybe a nail or screw embedded in the tyre but not serious enough to warrant any sudden intervention. Also, I was busy and I thought I'll get it fixed if it gets too much.
There is something called tempting fate and guess what, the next morning itself it got too much and I had to make time for it. The tyre was almost flat and I had to fill it up using my kid's cycle pump to get it to some sort of operational pressure. I was reaffirmed of my hate towards cardio.
This time I took her to a puncture repair shop in the evening on my way home and told him of the slow but now fast leak. However, the tyre had held the pressure from morning till evening and I was not sure anymore as to how the leak behaved. So he removed the tyre and first inflated it to 40 psi. The machine started from 19 psi. On visual inspection of the tyre , no nail, screw or any other object was seen to be embedded in it. He started on the soap water test and covered entire tread, sidewalls, valve and rim with it but still no bubbles. Since he had other customers he went to help them and I decided to step in and paint the tyre soapy and discover the elusive bubble. I too failed spectacularly.
Now he came and dunked the whole wheel in a tub filled with water to see any escaping bubbles and guess what, no bubbles. He was now giving me a look that said 'are you wasting my time? or is there really a leak" and I was like, believe me it's there. He took the tyre out and kept it there and I was almost sure that it is some black magic is causing this. I asked him to put the tyre back since it was a waste of time to investigate it anymore and I was mentally preparing myself to dedicate 10-20 mins of my time every morning for a new cardio regime.
Before, he started the work, I tried putting the dust cap on and there it was, a small spit, the water in the nozzle squirted out when the dust cap went in. We both saw that and looked at each other. I was like, see!! and he was, 'I didn't expect that'. So the cause of the leak was the pin inside the valve hitting the dust cap when tightened. The amount of leak depended on how much you tightened the dust cap.
When I did the tyre rotation, they might have put the wrong pin in the valve or the pin might not have been tightened fully. The tip of the pin was gitting a rubber stopper inside the dust cap. May be the dust cap was not tightened much previously and the leak escaped observation as I usually topped up every two weeks. He told me that he will tighten it but I asked if he could replace it and he did. Did the pressure check and bubble check again and yay, no more bubbles, even with the dust cap on. For safety, he gave me bigger dust caps with more depth.
Paid the man Rs. 120/- for his efforts and time and brought Panda home. It has been a week since and its holding.
Last edited by BLACNWYTE : 5th February 2024 at 12:52.
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