Spark Plug Wrench

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Part# 13-03921
MFR Model# 32-1291


Loosen or tighten your spark plugs with this handy tool.

2 ends: 13/16" & 3/4"
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Kurt R Verified Purchase


November 25, 2021

Unfortunately wrong size. I am looking for 5/8 .

Sergey A
August 26, 2020

The size was wrong as listed on the write up, we did get a replacement one from spruce and it worked great.

Robert A
March 28, 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: Is this for 7/8 spark plugs?

No. They will work on 5/8" plugs which have 3/4" mounting nut.

Q: Part number 13-03921 spark plug wrench: will this fit a 7/8" plug? If not, do you have one that does?

This wrench has 13/16" & 3/4" size ends. We do have a socket for spark plugs. P/N 12-01693 with a magnet or 12-00710 without a magnet will work for 7/8.

Q: Will this work on a Champion REL37B? Other 13/16 sparkplug sockets are to short reach the hex portion of the plug.

Per manufacturer: We are unsure but we can tell you the reach is 3-1/4" long.

Q: Will this work on tempest urhm40e?

No this is intended for automotive type plugs.

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