When they break....

simtech

En-Route
Joined
Aug 15, 2012
Messages
3,080
Location
mississippi
Display Name

Display name:
Simtech
They break good! First time replacing a vacuum pump and I was very surprised to see the spline and everything else in there being plastic. I guess thats good so it can shear and not break stuff in the case but still I was surprise.

Think it's still usable? I'll tell you what the nut on the bottom left by the tach cable is absolutely a pain in the butt as is changing the filters behind the panel!

But I have vacuum so all is good.


20170224_172420.jpg
 
The shaft is designed to shear like it did when the pump fails to protect the gears in the accessory case. The new pump will have a new coupler installed.
Bob
 
Gate clicker doubles as a billfold since once inside the gate it cost money!

200 hrs on the broke one! I don't understand that but whatever now all lines are clean, new filters, and a new tempest pump.
 
200 hrs on the broke one! I don't understand that but whatever now all lines are clean, new filters, and a new tempest pump.

What happened to the pump previous to the one that just broke? If a pump wears out and self-destructs, there's enough volume of vacuum in the instruments to cause a brief suction back into them, sucking broken bits of pump vanes and rotor back up the lines. The next pump gets to eat that stuff, and it usually fails it early.
 
What happened to the pump previous to the one that just broke? If a pump wears out and self-destructs, there's enough volume of vacuum in the instruments to cause a brief suction back into them, sucking broken bits of pump vanes and rotor back up the lines. The next pump gets to eat that stuff, and it usually fails it early.

I don't know, didn't own the plane then. I cleaned out the lines and even last annual replaced my AI and doing DG this annual. Thankfully they have screens on them.
 
Here's a little secret for getting that bottom left fastener. First, there' a special tool you can buy, or make if you're so inclined that has a 90 degree bend in the shank to get around the pump. Second, take a little super glue and glue the washer to the nut and get 'em on the stud both at the same time. The washer helps to hold the nut on the threads until you can get it started. And of course, you gotta hold your tongue just right.

Turns it into a 20 minute job.
 
Here's a little secret for getting that bottom left fastener. First, there' a special tool you can buy, or make if you're so inclined that has a 90 degree bend in the shank to get around the pump. Second, take a little super glue and glue the washer to the nut and get 'em on the stud both at the same time. The washer helps to hold the nut on the threads until you can get it started. And of course, you gotta hold your tongue just right.

Turns it into a 20 minute job.

yeah ill have to make a special tool like that and the super glue trick would have been premium! As it was it turned into an hour job, and lots of swearing! Funny thing was when I removed it that bottom left nut was already backed off to where the pump was holding the nut in place!
 
those are not rebuildable.
 
Even back in the late 70s when I was there they were having difficulties. Figured it would've happened many years ago.

It was actually kind of a shock to us. Now he has him a young gal with more kids.
 
yeah ill have to make a special tool like that and the super glue trick would have been premium! As it was it turned into an hour job, and lots of swearing! Funny thing was when I removed it that bottom left nut was already backed off to where the pump was holding the nut in place!
Last mechanic probably thought "the HELL with this"

Sent from my LG-LS997 using Tapatalk
 
Maybe they happen in 3s, like that old saying about plane crashes. So two down, who's up?

I was the first back in January so that's three. All is well with the world again. I had the tool but I didn't know about the super glue trick. I reverted back to my jet engine mechanic days and used beeswax.
 
Losing vacuum sucks.


Go back with an airwolf...
 
What happened to the pump previous to the one that just broke? If a pump wears out and self-destructs, there's enough volume of vacuum in the instruments to cause a brief suction back into them, sucking broken bits of pump vanes and rotor back up the lines. The next pump gets to eat that stuff, and it usually fails it early.

Don't know if these things work, but I installed a CV1J4 “Clear View” Inline Vacuum Filter just for the purpose you describe.

000583.jpg
 
Back
Top