----- Original Message -----

From: Leon

To: Rotary motors in aircraft

Sent: Friday, January 07, 2005 2:46 PM

Subject: [FlyRotary] Oil Pump Drive Key was Re: [FlyRotary] Re: Some things to check

Wendell,

 

Ed Anderson had a problem where the oil pump Wooodruff key wasn't in the keyway.  The drive was just taken by the friction of the tensioned nut. Worked for a while. Sooner or later,  the sprocket will slip on the shoulder of the pump shaft.  The symptom is intermittent loss of oil pressure,  which gets worse as the sprocket wears on the shaft shoulder.

 

So,  as I said in the post below,  always make sure that the key is actually in the keyway before fitting to nut & lockwasher.  The key itself is very tiny,  and it requires a bit of juggling to get it in the keyway in the sprocket.  I normally gently stake the keyway in the shaft so that the key can't slip out.

 

Hope this makes sense!

 

Leon

Thanks Leon, can proper installation be checked by inspection or do you have to remove the pump and start over?

Wendell