Team-BHP > Under the Hood > Modifications & Accessories > Tyre & Alloy wheel Section


Reply
 
Thread Tools Search this Thread
Old 7th August 2019, 21:19   #1
Tgo
BHPian
 
Tgo's Avatar
 
Join Date: Apr 2011
Location: Pata(l)-Jaipur
Posts: 476
Thanked: 501 Times
Default Generic Tyre Inflator Teardown

A few days ago the 6 year old Coido tyre inflator I had acted up in a strange way. I had to top up the air by 2-3 PSI in each tyre and it seemed to take a good 5 minutes per tyre. I decided to open it apart to have a look at its innards hoping to find something that I would be able to fix.
Generic Tyre Inflator Teardown-06dec57a01334c0f9777b1281f6fe5e1.jpegGeneric Tyre Inflator Teardown-6f7acfef3c2f45f19c23b994010594b6.jpeg

I thought of putting my observations down so that one gets to know how it works and if there are any serviceable parts in it. The first thing i learnt was that it was a simple piston type reciprocating pump where I was expecting it to have a diaphragm as the working element.

Generic Tyre Inflator Teardown-7138855947e046098edf6dc1abdbd2d1.png
  • The motor looks like a brushless (hoping very high) or a non serviceable brush type motor. It is the heaviest part in the whole pump. It is sandwiched between the two casing halves with two rubber isolator pads for damping.
  • The bracket houses the main bearing which is a simple bronze bush. It had too much of a clearance for my liking. But on hindsight it might have been there for the crank to tilt slightly so that the con rod big end can be slid onto it.

    Generic Tyre Inflator Teardown-48bcf3155f9d498380f47c4c8a95f70a.jpeg
  • The crank was the only decently machined part with a hardened surface for longevity.
  • The con-rod had no bearings on either ends.
  • The piston was made from plastic and had a good quality rubber/silicone ring which had a groove to hold up some amount of lubricant.
  • The cylinder bore was smooth but was out of round and this could be felt by touch.
  • The cylinder head had the inlet and outlet valves in-built (press fitted/riveted).

    Generic Tyre Inflator Teardown-656a8a3e61584c948728ecb208607725.jpeg
  • The inlet valve is just a thin sheet of metal allowing air into the cylinder (one direction only, at least in theory).
  • The outlet valve seemed to be spring loaded and built into the outlet stem threaded onto the cylinder head. This had a soft rubber seat which seemed more functional than the sealing action provided by the thin sheet metal of the inlet valve pushing against the cylinder head to seal that port.
  • Rest of the system looked like well built and leak proof plumbing which I did not want to disturb

The only servicable parts in this arrangement was the Piston Ring. Everything else had a consumable like built and quality of material. No bearings to grease, no damping pads that perished, no parts that seemed upgradable.

Before uploading this post, searched the internet to find: THIS

Last edited by Tgo : 8th August 2019 at 20:05.
Tgo is offline   (32) Thanks Reply With Quote
Old 9th August 2019, 10:36   #2
Team-BHP Support
 
Join Date: Feb 2004
Location: Mumbai
Posts: 8,742
Thanked: 32,866 Times
Default Re: Generic Tyre Inflator Teardown

Thread moved out from the Assembly Line. Thanks for sharing!
Aditya is offline   Reply With Quote
Old 9th August 2019, 11:34   #3
Distinguished - BHPian
 
SS-Traveller's Avatar
 
Join Date: Jan 2009
Location: New Delhi
Posts: 7,031
Thanked: 14,356 Times
Default Re: Generic Tyre Inflator Teardown

Quote:
Originally Posted by Tgo View Post
The cylinder bore was smooth but was out of round and this could be felt by touch.
...
The only servicable parts in this arrangement was the Piston Ring
Isn't there an inlet air filter of some kind that needs to be cleaned out occasionally?
SS-Traveller is offline   (1) Thanks Reply With Quote
Old 9th August 2019, 11:49   #4
Distinguished - BHPian
 
paragsachania's Avatar
 
Join Date: Nov 2007
Location: Belur/Bangalore
Posts: 5,612
Thanked: 16,111 Times
Default Re: Generic Tyre Inflator Teardown

Quote:
Originally Posted by SS-Traveller View Post
Isn't there an inlet air filter of some kind that needs to be cleaned out occasionally?
I don't recollect if there was any filter for the inlet.

I had dismantled this 5 years back when one of my friends asked me to repair it. Exactly then I realised how these "inflators" are designed and whatever casing/covering you see externally is merely a design to attract buyers and label with different models .

The construction of every inflator, right from the one that costs 900 bucks all the way to 5000/- is exactly the same. The only differentiating factor would be the quality of the motor that drives the pistons in the cylinders. I have noticed that even the Cylinder+Piston set-up is same for most of these inflators thus draining the claims of "Heavy-Duty" and et al that sellers advertise.
paragsachania is online now   (11) Thanks Reply With Quote
Old 9th August 2019, 12:30   #5
Distinguished - BHPian
 
SS-Traveller's Avatar
 
Join Date: Jan 2009
Location: New Delhi
Posts: 7,031
Thanked: 14,356 Times
Default Re: Generic Tyre Inflator Teardown

Quote:
Originally Posted by paragsachania View Post
I don't recollect if there was any filter for the inlet.
Okay. Because my tyre inflator has a felt-like washable air filter, which needs to be cleaned out occasionally. Goes a long way to protect the cylinder and piston from wearing out, I'm sure.
SS-Traveller is offline   (4) Thanks Reply With Quote
Old 10th August 2019, 08:38   #6
BHPian
 
Join Date: Mar 2014
Location: Bangalore
Posts: 122
Thanked: 273 Times
Default Re: Generic Tyre Inflator Teardown

Quote:
Originally Posted by paragsachania View Post
The only differentiating factor would be the quality of the motor that drives the pistons in the cylinders. I have noticed that even the Cylinder+Piston set-up is same for most of these inflators thus draining the claims of "Heavy-Duty" and et al that sellers advertise.
Manufacturers might be using different bore/stroke numbers to make it heavy-duty. Needless to talk about RPM at which the motor runs (more RPM, the better). Other differentiating feature is number of cylinders. I use a twin cylinder for long which has faster air filling capability compared to single cylinder ones.

Last edited by vinodvayyat : 10th August 2019 at 08:40. Reason: Added more.
vinodvayyat is offline   (4) Thanks Reply With Quote
Old 10th August 2019, 08:43   #7
Distinguished - BHPian
 
paragsachania's Avatar
 
Join Date: Nov 2007
Location: Belur/Bangalore
Posts: 5,612
Thanked: 16,111 Times
Default Re: Generic Tyre Inflator Teardown

Quote:
Originally Posted by vinodvayyat View Post
Manufacturers might be using different bore/stroke numbers to make it heavy-duty. Needless to talk about RPM at which the motor runs (more RPM, the better). Other differentiating feature is number of cylinders. I use a twin cylinder for long which has faster air filling capability compared to single cylinder ones.
Twin Cylinders is something I have come across too and this is the case even with Heavy Duty foot pumps.

However, when it comes to size the cylinder most of them I have come across are one and the same. This is not something I am referring to on this thread. I have been telling about it on the inflator thread since quite a few years. Whether it is Coido, ResqTech, Windeck, Michelin or any other.
paragsachania is online now   (2) Thanks Reply With Quote
Old 13th August 2019, 11:12   #8
Tgo
BHPian
 
Tgo's Avatar
 
Join Date: Apr 2011
Location: Pata(l)-Jaipur
Posts: 476
Thanked: 501 Times
Default Re: Generic Tyre Inflator Teardown

Quote:
Originally Posted by SS-Traveller View Post
Isn't there an inlet air filter of some kind that needs to be cleaned out occasionally?
Do share a picture of your inflator. The filter seems like an illogical exclusion in my case.
Tgo is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tyre pressure gauge and portable inflator pump / foot pump adityapd Modifications & Accessories 760 5th June 2019 19:17
Review: Goodyear RCP-B31C Digital Air Compressor (Tyre Inflator) Stryker Modifications & Accessories 30 24th August 2017 05:55
An inflator that seals flat tyre! rajesh1868 Tyre & Alloy wheel Section 51 2nd January 2014 12:05
MotoGP bike teardown at embedded.com prasadee Technical Stuff 2 24th August 2007 08:49


All times are GMT +5.5. The time now is 22:20.

Copyright 2000 - 2019, Team-BHP.com
Proudly powered by E2E Networks