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Primer Overhaul Kit

$7.75/Each
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Part# 05-03637

Overview

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.
   
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Application

  • 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
  • Frequently Purchased With
  • Customers Also Viewed

Reviews

Perfect. Excellent product and instructions.

Daryl P Verified Purchase

Primer Overhaul Kit

September 23, 2024

Michel C Verified Purchase

Primer Overhaul Kit

August 15, 2024

Perfect fit. Included directions made this overhaul so easy to do myself. Highly recommended.

Jonathan H Verified Purchase

Primer Overhaul Kit

August 7, 2024

Great product and fast shipping.

John M Verified Purchase

Primer Overhaul Kit

June 27, 2024

Did the trick for our 172N!

Logan E Verified Purchase

Primer Overhaul Kit

May 28, 2024

My fuel primer had no resistance when pushing and pulling. The old o-rings were old and dry. The new o-rings were easy to install. You just unscrew the nut on the outside, then pull the plunger out. The rest of the plunger body stays in the dash. After reinstalling the plunger, my primer still did not work. I was lucky to find a tip on an online forum that the check ball could be stuck in the body. They said to pull out the primer very quickly several times to try and break it loose. It worked! After a few fast pulls, the primer works like new.

Eric F
May 24, 2024

Rod H Verified Purchase

Primer Overhaul Kit

May 11, 2024

OMG ! this is the easiest and best $10 you will ever spend. My primer was so stiff, I could barely unlock and pull it out. I read about this kit in a discussion forum, and they said it was so easy and a 10 minute job. Based on that review and the courage to do it, I bought it. If you have NO handy ability at all then have your mechanic show you the first time, but if you are the least bit handy, you can do this. repalce the O rings, clean the interior with acetone, regrease with the provided grease, and OMG it work just like butter. So good. Unbelievable. Highly recommended. Why the hell didnt the last annual do this? So easy.

Brent B Verified Purchase

Primer Overhaul Kit

April 16, 2024

Inaebnit Verified Purchase

Primer Overhaul Kit

April 2, 2024

*****

James M Verified Purchase

Primer Overhaul Kit

March 28, 2024

Q&A

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 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?

MS29513-012

Q: Are the o-rings in the kit Viton?

No they are 70 Duro Nitrile material.

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