[NSRCA-discussion] DZ160/170 check valve

[Dave Harmon]

I just went through this same thing this afternoon.

The top half of the check valve unscrews..hold the fuel nipple and unscrew
the top.

There is a diaphragm in the top and a plunger and spring on the back side if
the diaphragm.

Check it for trash and ensure that it works freely.

Look into the hole of the other half and make sure nothing is down in
there.you can back flush the injector tube by pressurizing the intake tube
when the engine is at TDC. 

The air and whatever else may be in there will blow out the top of the
injector tube.

If there is something wrong with the top part of the check valve you can buy
a new valve and just replace the top parts leaving the main housing still
attached to the engine.

The main part of the valve is a one-time use part..if you remove it.you have
to replace it with a new part.

If you have another engine with an injector check valve you can swap the top
parts and see wha' happens.

 

Regards

Dave Harmon
NSRCA 586
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok. 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Michael Cohen
Sent: Monday, July 05, 2010 3:35 PM
To: NSRCA
Subject: [NSRCA-discussion] DZ160/170 check valve

 

Lately, my 170DZ has been leaving quite a lot of fuel residue on the
airplane.  Following Richard Verano's advice, I ran the motor with the cowl
off upside down while my wife held the airplane.  The fuel is quite
obviously coming out of the black check valve on top of the motor.  I have
seen on this list before that the check valve can be lived without.  So
first question.  Does fuel coming out of the check valve means it has failed
in some way?  Second, how do I intentionally remove the check valve without
damaging the engine?  Third, once removed, do I still need one somewhere
along the fuel inlet path?
 
Mike Cohen 

  _____  

The New Busy is not the too busy. Combine all your e-mail accounts with
Hotmail. Get busy.
<http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28
326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20100706/19d43434/attachment.html>