Aircraft Timing Indicator - Model E25

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Part# 12-01014
MFR Model# E25


The Aircraft Timing Indicator Model E25 is a unique device that locates the relative relationships between the crankshaft, magneto point openings, camshaft and valve timing.

Easily attached to the propeller spinner with mounting bands that are included with the unit, the E25 quickly and accurately (within degree!) locates top dead center. The result: the all-aluminum Model E25 speeds up and improves the process of timing magnetos to the engine.

With its easy-to-read dial and 18mm, hardened aluminum piston stop, the E25 is a snap to use.

Note: Piston Stop is included.

California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


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Great product! Engine must be level (as if airplane is in flight)! Conventional gear airplanes will require the tail raised appropriately. Also, in case your wondering why you Must do the math correctly , it is because the engine stop plug is indiscriminately screwed into #1 cylinder (it is possible to use without the engine stop plug by determining exact top dead center with a screwdriver or socket extension), in which case , just set dial to TDC upon determining TDC on compression stroke! Lloyd

Lloyd M
October 6, 2023

have had one for a long time, cant find one one needs repair

Jack B Verified Purchase


May 12, 2023

Natron A Verified Purchase


February 22, 2023

Made timing much easier, especially on the old continentals where the timing marks line up on the bottom of the case. Would suggest putting a rag over spinner, the sharp aluminum left small scratches the first time I used it.

Michael P
October 20, 2017

Works like a champ! Simple easy to use. Simple, easy to follow instructions come with it.

Carl S
June 4, 2017

Another great easy to use product for what has always been a issue. Would be great (5 stars) if it came with two extra lugs to allow it to be used on a three bladed prop. Was easy to convert now mine does two and three bladed props real easy

Rory H
February 10, 2018


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the diameter of the "pot" where it meets up with the spinner? Thanks!

Per vendor: Approx 4-3/4"

Q: Does this work with a 3 blade prop?

This attaches the nose cone or spinner with elastic bands, it will work with a 3 blade prop.

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