(shhhh..... it's really a "Universal Valve Shim Calculator" tool)
To jump to the Current Version (see disclaimer and link at bottom of page)
(Having found this page) you likely already know what valve clearances are. You may already have been warned of the dubious joys of calculating what size shim to install, in order to correct out-of-spec clearances.
The math is REALLY simple. Pluses and minuses. Loose clearance requires a thicker shim to fix (and vice versa)
Q: What's worse than doing it up to SIXTEEN TIMES?
A: Doing it another sixteen times, when trying a different target clearance.
This is the only tool of its type that I'm aware of to comprehensively deal with the process, right through to saving the service record and re-use for next time. As a bonus it's also entirely web based. There are a plethora of excel-based tools, with only basic functionality.
You may set a shim "strategy" for inlets and exhaust shims (eg. "tight", "midrange" or "loose"). The tool will provide a shim to match that profile.
You can also specify the shim increments range. Your supplier may only provide shims in 0.05mm increments. Or choose an alternate supplier with 0.025mm.
Each valve shim can also be manually specified instead.
Immediate notification as to whether a shim will be over-, under- or in-spec.
Just follow the numbered steps and print off your new shim sizes (plus old sizes and clearances) for a complete record.
Also generated is a shim table so you know what quantities of each size shim to order (that you don't already have installed or in the tool box).
Or save the URL (email it to yourself) for next time. You won't need to re-type all the measurements in again.
Latest News -
29 March - New features...
19 March - Now supports FOURS as well as TWINS and TRIPLES.
15 March -
Major formula breakthrough, enabling full web-version functionality.
Order Sheet now works for web version. Now functions same as Excel version.
An appropriate date for the Triple version to go live!
My original Triumph (3 cylinder) Valve Shim Calculator (Excel version only) was launched in January 2003 and still resides on the Triumph Torque website (formerly T595.net).
Screenshot - 2003 Excel version
The layout is significantly improved. Needless to say, a web version also greatly improves accessibility.
It works on a range of browsers and devices; Firefox/IE8+/Chrome/Safari, iPad, android tablets, PC's, mobiles.
Is it overkill for something you may use only once every couple of years?
Well, hopefully it frees up some thought space for the task at
It's also useful to try on some what-if scenarios with switching shims, or seeing whether you can get by on shims already in the toolbox.
Scroll down to bottom and select the Calculator button after reading the Disclaimer.Other Projects
If you have a need for developing a similar
(commercial or otherwise) project, requiring the functionality of
a spreadsheet provided via a web interface, please contact me to
discuss. I have developed various solutions including registration
forms (e-commerce payment gateway integration), online estimator/calculators
and checklist/reporting solutions.
Ant (Triumph Rats) for initial layout and test bed (Bonneville T100). Yeah, that '04 spreadsheet layout has bugged me for ages too!
The Grovel Bit
This is where I grovel for spare dosh so I can get a sulking Triumph back on the road and pay some bills.
If you think this tool took some of the headache out of keeping track of all the shims, clearances and what size to put in, consider the hours I should have spent down in the potting shed with the Triple, instead of finessing Excel formulae :-)
Thanks and trust you find this useful! Scroll to bottom for a link to the web version.
Copyright AGBUZZ (2003-2013)
This Valve Clearance Shim Calculator (the "tool") should be used as a guide only.
No guarantees or warranties are provided as to the suitability of this tool to your situation.
You are strongly advised to refer to service documentation, detailing the correct procedures and specifications, for undertaking any aspect of engine service covered by this tool.
In particular, satisfy yourself that the estimated shim sizes required are as recommended by your service manual.
Nothing presented in this tool should be considered as professional
advice, including the target clearances, recommended shims or the use
of non-OEM shims.