Friday, February 5, 2016

Completing Move Of Oil Pressure Sender To Firewall – Well Almost

The changeover to Aircraft Specialty’s remote oil pressure sender kit has finally been completed (well almost). Covered in a previous post on January 31, 2016, measurements were taken so Aircraft Specialty could make a custom remote oil sender hose for the DOG Aviation RV-12 utilizing a different fitting and length than the one they would normally supply in their retrofit kit. The reason for this, as mentioned in the earlier post, is because a special mounting bracket was fabricated so both the oil and fuel pressure sending units could be mounted on the RV-12’s firewall. Vinyl tubing was used to make the measurements and the information was passed on to Steve at Aircraft Specialty … three days later, DOG Aviation’s receiving department took delivery of a custom, quality built, conductive Teflon hose in fire sleeve. Have to say the customer service from Steve and follow-up has been nothing less than outstanding for each of the five kits that have been purchased from Aircraft Specialty for the DOG Aviation RV-12 … Teflon brake line kit, Teflon Fuel line kit, Teflon remote oil pressure sender kit and the totally slick canopy locking system.
The custom made hose from Aircraft Specialty is a different length and has a 90 degree fitting where a straight fitting would normally have been on their stock hose.

There are two mounting options possible with the hose I ordered … depending on the final location for the voltage regulator. If the German built Silent Hektik  voltage regulator is mounted using the same mounting location on the firewall shelf as the Ducati regulator, the remote oil sender hose can be routed across the top of the Rotax engine, under the engine mount and then sweep over to the oil pressure sending unit on the firewall. This arrangement still allows for a cooling cap to be installed over the regulator so it can be blasted with cool air.
The hose for the remote oil pressure sending unit configured for a voltage regulator mounted on the firewall shelf. Because the regulator sits directly under the oil pressure sending unit, with the hose paralleling the firewall, there is plenty of room for the blast cooling tube used to cool the regulator to pass in front of the oil pressure sending unit.

The other option available which is likely better (especially for those who have followed Van’s latest mounting instructions to move the voltage regulator under the instrument panel shelf) is to run the hose for the remote oil pressure sender following the same path as the hose for the fuel pressure sending unit. The hose length I chose will work for this route, but ideally could be an inch or two longer.
Hose for the remote oil pressure sending unit routed along the same path as the hose to the fuel pressure sending unit. This may be a preferred solution if the voltage regulator is not directly under the oil pressure sending unit..

At this point in time, the final decision has not yet been made on where the voltage regulator will be located, so the engine end of the remote hose will be tightened ... but the fitting on the sending unit will remain loose until a final decision has been made regarding the location of the voltage regulator which will dictate which way this hose will need to be routed.
The Aircraft Specialty conductive Teflon hose for the remote oil pressure sending unit is connected to the adapter/restrictor installed on the Rotax engine.