lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> REPOSTED FOR Matt Reeves <mattreeves@yahoo.com> Hello everyone. This is a new install, first time run, on a Lancair 320 MKII, ground test. I'm hoping someone who is smarter than me can shed some light on a little problem I am having. I have the new style pump. I blew out all the lines with compressed air, filled the fluid with 5606G, jacked up the plane, and fired up the pump. As soon as I connected the pump, I heard exactly this, "clunk, clunk clunk" just like a hammer tapping fast on the pump. In the gear downmode it is slightly faster and louder. NO fluid moves in the lines. Since this is a first time run, is this some type of plug I forgot to remove on the pump itself? Could this mean my pressure switches are backwards? Someone wrote on the high and low and as far as the writing goes, it is installed correctly. I did check the wiring and it seems to be fine. I did not install the transition light for this initial test. Could that be the problem since it is connected to both high and low relays? Has anyone ever had this happen to them? What did you do about it? By the way, it is "clunk, clunk clunk" just like that. I did write to Parker co and here is their response. I would rather not go tearing the pump apart if it is just something simple I am overlooking. I really appreciate all of your help!!! P.S. Why would my coupling be broken on a brand new motor? Thanks, Matt Reeves Response from Parker. Matt: thank you for your message. You have me baffled by the description of the sounds you are hearing! I'm not sure what could be causing it but you could try removing the electric motor from the power unit and see if there is a problem with the coupling.If the coupling, which goes between the motor shaft tang and the pump shaft tang, is broken that could be the culprit. Attached are two files - one is a generic exploded view drawing, the other the startup and priming instructions. With the motor off the power unit you could energize it and make sure the motor is running properly in both rotations. If the motor and coupling are in good shape, reinstall the coupling back down onto the pump shaft (the small slot end goes toward the pump shaft) and, using a flat blade screwdriver, make sure the pump shaft will turn in both directions. Let me know what you find after this troubleshooting and we'll try to determine where to go next. The pressure switches are not supplied by Oildyne but even if the pressure switch failed it shouldn't cause any type of mechanical noise like you are hearing. With the Oildyne power unit it is critical to follow the priming and startup instructions. If the second port of the power unit is not plugged off (your finger will do) it will pull air into the pump and prevent you from pulling oil from the tank to pump out the first port. Regards, Bryan Anderson Oildyne Division Product Manager : LML website: http://members.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please remember that purchases from the Builders' Bookstore assist with the management of the LML. Please send your photos and drawings to marvkaye@olsusa.com.