CSOBeech - Beechcraft Starter Solenoid Sources


Starter Solenoid Sources
OK, so your >40 year old master relay or starter solenoid is crapping out or has high resistance. Here are some thoughts from Beech Listers on how to get yourself out of a jam. Personally, I carry a serviceable solenoid/relay in my AOG Box for emergency use but if you find yourself in a jam, check out this info: See the Cole Hersey Solenoid Catalog HERE Brad H. suggests checking MarineAir Supply and using "Eaton" in your web searches instead of Cutler Hammer. My B55 uses: Starter Relay - Intermittent 200A - 6041H190 Cutler Hammer Master Relay - 6041H189 Cutler Hammer John M. reports as relates to 12V solenoids: I got a 24041 years ago from West Marine, it was a special order, about $32. There was a discussion about this a few years ago, maybe you could search the archives. Here's part of a message from billvtail: "BTW, for people stuck replacing a 12V starter solenoid, there is a suitable automotive style 12V system starter relay is available from Stancor, p/n 70-901, with a 6V coil, metal can, OK temp range, 80A continuous, 800A inrush, and it's $13 (now up to $19) from Allied Electronics, p/n 576-1017. Only limitation is its max temp spec is +122F. Looks just like what the homebuilders use, or what's on your dad's dad's tractor." Download the 576-1017 Datasheet HERE My understanding is that you 12V folks use a 6 Volt solenoid so that at start time the lower battery voltage allows the solenoid to stay closed. Here is some more solenoid info posted by Beech Lister and Bonanza owner Larry G.: "Cole Hersee 24041 is an intermittent duty relay. Cross references to the original Delco part # used by Beech as a starter relay. 6 volt rating is correct for our 12 volt systems. About $40, available through West Marine special order if you can't find it elsewhere. Gong through West is a strategy for getting around Cole-Hersee's $100 minimum order. Here what is marked on Cessna's starter relay - used for the same basic engine/charging system combo as 12 volt O & IO TCM powered Beechcraft: (maybe E-engines, too - don't know) W-R/RBM 111-138D Coil 12VDC Int. S-1991A1 This Cessna part is also about $40 and it looks identical to both the no-longer-available Delco and the Cole-Hersee. Your "regular" shop should be able to order you one. They might even have one in stock. Delco quit making the "6 volt" starter relay years ago. When Beechcraft ran out of them, they did not buy equivalents from either Cole-Hersee or whoever makes the Cessna part. Instead, they came up with an $800 kit to use another Cutler Hammer Master Relay in its place. Kit includes a little bracket, 2 rivets and installation instructions. This switch is overkill in the starter relay application. Why 6 volt? The original Delco part was designed for cars with 6 volt systems. It can safely carry plenty of current when transmitting power from a large car battery. Airplanes use batteries with less reserve capacity than car batteries. When the starter is energized, the current required pulls battery voltage down. With a 12 volt relay (from the 1950's), that voltage can be pulled slightly below the voltage required to keep the relay energized. Hence the relay will "hammer" open & shut. With the 6 volt relay, the "break" voltage is lower, eliminating this problem. I also suspect Beech bought a boat load of them for cheap when GM quit making 6 volts cars. Worried about approval/paperwork for the Cessna or Cole-Hersee part? A while back, the TCDS changed slightly. For my J35, at least, the note listing a specific part number for starter relay was removed. The Cessna part is clearly "aviation", and I it used for approved applications using the same battery, starter, and charging system. Good enough for me and good enough for my IA. It's logged as "replaced starter relay with equivalent" and includes the part number." Here is more info on 12V solenoid parts interchanges: Delco-Remy 1114213 or 1118823 Superseded part # 1114539 Cole Hersee 24041 Standard SS544A