Leaking primer causing black pipes

How to keep the Cessna 170 flying and airworthy.

Moderators: GAHorn, Karl Towle, Bruce Fenstermacher

Post Reply
cfiatzph
Posts: 123
Joined: Sat Nov 19, 2005 11:04 pm

Leaking primer causing black pipes

Post by cfiatzph »

What exactly has to be replaced on a primer that is making black soot on one side of the engine (the side the primer is in) Is it the two o rings at the engine of the plunger or is there more?

Thanks
User avatar
blueldr
Posts: 4442
Joined: Thu May 02, 2002 3:16 am

Post by blueldr »

IF YOUR PRIMER IS PUSHED ALL THE WAY IN AND TURNED TO THE LOCKED POSITION, THE FUEL SHOULD BE LOCKED OFF. IF IT IS LEAKING, THERE MAY BE SOME FOREIGN SUBSTANCE UNDER THE SEAT AND YOU WILL HAVE TO FLUSH IT OUT. THE EASIEST WAY TO DO THIS IS TO DISCONNECT THE LINES TO THE PUMP AND REMOVE THE PUMP FROM THE PANEL TO CLEAN IT ON THE BENCH.
BL
cfiatzph
Posts: 123
Joined: Sat Nov 19, 2005 11:04 pm

Post by cfiatzph »

So in the entire primer there is only two o rings that are on the plunger. I don't have a black exhaust I was just doing a little PM because the primer stuck so I replaced the o rings a viola just want to make sure everything was set.

Thanks
User avatar
Bruce Fenstermacher
Posts: 10422
Joined: Tue Apr 23, 2002 11:24 am

Post by Bruce Fenstermacher »

Just the 2 o-rings. That is it.
CAUTION - My forum posts may be worth what you paid for them!

Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Post Reply
Cessna® is a registered trademark of Textron Aviation, Inc. The International Cessna® 170 Association is an independent owners/operators association dedicated to C170 aircraft and early O-300-powered C172s. We are not affiliated with Cessna® or Textron Aviation, Inc. in any way.