Worked amazing on my Continental O470R that had no other timing marks on it.

Charles A Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Works well and very simple to use.

Adam Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Works great. Just put a little engine oil on the grommets and you are good to go, otherwise it is very difficult to get onto the bolts

Bobby M Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Quick technique to see if mag timing may be an issue.

Jared K Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

This FAA A&P, the greatist thing since sex. Very easily used by the owner, check by the owner for engine timing, Change by A&P only. Many engine coughs and sputters affect engine timing, I could name 10 very quick. And keep you from walking home. Nice to have, 60 years ago. Worth $$$$. Havent checked Lycoming yet.. CH

These are a great quick reference for verifying timing. No complaints.

Eric S Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Love this tool!

Samuel J Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

I saw an ad for this in the Cessna Pilot Association magazine and the ad said the tool for the 470/520/550 was also for the IO 360 ( which I have on my R172K Hawk XP) . Turns out that it works fine but with some exceptions. The clearance between the prop hub nuts and the front of the engine is too tight to insert the tool with the friction grommets in place. I removed the grommets and could slide the aluminum gauge in the gap and over the nuts. There was some minor side-to-side slippage, so I used some double sided foam tape to secure the gauge exactly when the #1 cylinder was at TDC to align the TDC mark on the gauge . Without the play, the 20deg notch was solid and good for timing the IO360KB engine. Happy with this

Steve K Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Works great with no moving parts!

Andy K Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Great tool, everyone with a continental should have one. Most A&P and IA have one

Dan B Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Awesome tool. Works great.

Keith P Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

nice tools ill be more precise while timing

Great tool. Works as advertised. So easy, just set engine near tdc and slide gage over prop hub bolts. One negative, on Bonanzas where cowl does not remove, they should print timing marks on both sides of gage for siting down the case centerline. I had to duplicate marks on other side of gage. Still not a big deal. So much easier than timing with a cone. no leveling, no spinning prop.

This is a great tool if you want to do a quick check on your magneto timing for the recommended engines.

The O-300D has the same propeller bolt pattern an the O-470, IO-520,& IO-550 which is 6 1/2 holes in a 4 diameter. The tool works on the O-300 D!

I had set my timing using the older method. Then used this to check. I was very pleased how easy and I think more accurate using this tool is. There are too many steps in the old method where you can make 1 to 2 degree errors. This is right on. I use a mirror to sight down the spine of the case. Very accurate

After using the flower pot and piston stop this tool is fantastic! get #1 on TDC, Install this tool set 22 degrees and install and set the mags.

One of the most useful tools for working with Continental engines. Much better than the traditional timing indicator (dial on the prop). A must have item due to its simplicity, ease of use and speed.

Arrived promptly. Compared tool with flowerpot timing device. Very accurate on the O-300D. Tool fit and worked great. Only downside is the finish was rather rough. Appears to have been cut on bandsaw and had some sharp edges. Sanded down. Did not affect functionality.

Daniel B Verified Purchase

Continental Engine Magneto Timing Tool O-300 C D / 470 / 520 / 550

Doesn’t work on a plane with prop electric de-ice.

Used 12-05514 timing tool one time and the magnet fell off during removal from the crack. It appeared the glue was brittle and applied with 50% coverage.

Will only work on certain aircraft with access to the crankshaft hub. No can do on my Cirrus.

Doesnt work on TCM O-300D. According to web site it does. Tool only lists 470,520 & 550 engines. Actual attempt failed.