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Part# 05-03637


The kit is replaces the worn O-rings (2) on the primer pump used on non-fuel injected engine installations. The primer seals frequently are not re-lubricated until someone complains the primer isn't working or the engine is hard starting. This is most evident by the pump being hard or stiff to operate. Generally speaking, by the time the pump stops performing, the seals are worn (to the point that lube is of little value) and must be replaced.


  • Beech 19/23 Series
  • Cessna 120,140,150,152
  • Cessna 170, 172, 175, 177
  • Cessna 180, 182, 185
  • Cessna 190, 195,
  • Cessna 205, 206, 207
  • Cessna 210
  • Cessna 336, 337
  • MK20 Series
  • PA-24, PA-28, PA-28R, PA-44

In The Box

  • 2- O-rings
  • 1 packet of Seal Lube
  • Detailed instructions


Exactly what I needed, very much appreciate the instruction sheet.

April 2, 2021

Helpful sales lady

Tom G
February 25, 2021

Havent yet installed this primer overhaul kit in my 172D, but I put the primer overhaul kit in my 150G and it was perfect.

Bill H
February 15, 2021

The o-rings were the correct size for a perfect fit. Very good and detailed instructions.

Don B
December 21, 2020

Judging from the squeaking that was eminating from my primer prior to the installation of this kit the primer orings had not been lubricated in many years. With the cold weather, the operation was only getting worse. After the installation of the kit, the primer operation is far easier and no more squeaking. The lubricant that comes with the kit is likely enough for a lifetime supply for re-lubricating it which the instructions recommend on a regular basis.

Bill D
November 13, 2020

Excellent kit with good instructions. It included the two O-rings and silicone lubricant. But now that I know how to do the overhaul, I would probably just order the O-rings next time.

Tom B
November 2, 2020

Was an easy fix for a leaky primer. Was only a few minutes and had great directions. Would buy again and sooner than last time!

October 7, 2020

Worked fine. Includes lubricant. EZ fix. Hope it lasts!

September 25, 2020

Good instructions, super simple fix to a frustrating situation.

Jeremy G
September 1, 2020

Fast and easy installation with good directions. Primer works like new.

Marco R
August 31, 2020


Q: What are the dimensions of the o-rings in this Primer Overhaul Kit? I have a Lukenheimer primer on a Cessna 140.

The dims are as follows: 3/8" I.D. x 1/2" O.D. x 1/16" cross width of o-ring.

Q: FYI: I just measured the O-rings on an Essex primer. They are the same dimension as the O-rings in this kit.

Ok thank you for the information. We will post it for other customers.

Q: What is the MS number for the o-rings in this kit?


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