

| Subject: | Re: Trying to understand starter stuff |
| From: | Marc Perdue |
| Date: | Tue, 23 Dec 2014 13:19:54 -0500 |
Because of the number of replies suggesting the Jay Brown Hard Start Relay, and because of the great reviews it's gotten and the fact that it makes sense to me, I ordered it about 4 hours ago. Thanks everyone! I'm so looking forward to having some warm, dry weather to install some upgrades on my van!!! Heck of a Christmas present, in my mind . . . Marc On Tue, Dec 23, 2014 at 12:57 PM, John Rodgers <jrodgers113@gmail.com> wrote: > I have one of Jay Browns starter relays on both of my vans. Recently I > discovered that I could pull the relay cover and actuate the relay by hand, > thus making it work as a remote start switch when working onthe engine. > Very handy. > > John > On Dec 23, 2014 10:49 AM, "Stuart MacMillan" <stuartmacm@gmail.com> wrote: > >> Here is a nice relay setup: >> http://www.thesamba.com/vw/classifieds/detail.php?id=1119534 (Won't work >> with an automatic with factory cruise control for some reason though.) >> >> Stuart >> >> -----Original Message----- >> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of >> David Beierl >> Sent: Monday, December 22, 2014 9:46 PM >> To: vanagon@GERRY.VANAGON.COM >> Subject: Re: Trying to understand starter stuff >> >> At 11:03 PM 12/22/2014, Marc Perdue wrote: >> >Hi all, >> >> Excellent! I now have three verified cases of a starter control lead >> coming >> off without causing a hard start failure: your Van, my '89 2.1l, and my >> '71 >> Fiat 128. I solved that one after running out of gas in an uphill line to >> buy gas somwehere in upstate New York, when it became clear that the motor >> would crank if it were torqued slightly sideways. >> >> Starters have some challenging necessities. They have to have big cables >> direct to the battery; a heavy switch that can switch them on and off under >> load without burning up quickly; a means of engaging the pinion into the >> flywheel ring gear; and a positive means of disengaging it when the motor >> starts, so the starter doesn't burst from overspeed. >> >> Back when the world was new the electrical switching was done by a >> heavy-duty relay that would today be called a contactor but was commonly >> known as a solenoid. It was mounted somewhere between battery and starter, >> and a light wire from the starter button or key switch used to activate it. >> For testing you could use a screwdriver to jumper between the big battery >> cable connection and the control terminal. Starter "solenoids" were a >> commonly available FLAPS part and no doubt still are; as they regularly >> failed in use. Last one I bought cost three or four dollars. Excellent >> for >> switching a couple hundred amps DC but not rated for continuous duty. >> They're meant for starting cars, once per trip segment, plenty of time to >> cool in between. >> >> Engaging and disengaging the pinion was accomplished by a clever invention >> called a Bendix drive. The pinion was mounted on the starter shaft and >> engaged a pair of helical slots in the shaft. It was kept wound down to >> the >> bottoms of the slots by a light spring that pressed it away from the end of >> the shaft. When you hit the button, the shaft would spin violently and >> hurl >> the pinion into engagement during the first few revolutions. And when the >> motor started, the ring gear would spin the pinion back down the track out >> of engagement. It worked a treat, so long as you kept it clean and not >> gucked up with oik or grease. The Bendix Corporation waxed fat and happy. >> >> Came the day that someone thought it would be better to combine actions. >> If >> the contactor were mounted on the starter it would simplify wiring, and it >> could be used as a real solenoid, to physically throw the pinion into >> engagement as well. Or rather a solenoid could be thus used, and with some >> contacts added could perform the contactor function as well. An >> overrunning >> clutch would handle decoupling the starter from the engine, leaving the >> pinion in engagement but not forcing the starter to keep up with it. Full >> disengagement would happen when the key was released. Over a decade or two >> this method largely took over for starting cars, and that's how Bosch did >> it >> on our starters. >> >> The big cable goes direct from battery to starter, where it meets the >> thinner wire from the alternator that supplies charge. That connection is >> subject to corrosion. The ground connection through the starter, bell >> housing, transmission ground strap may be defective. The solenoid itself >> wears and gets crudded up; you have to take the starter apart to clean it >> up. Non-A/T versions of this starter have no bearing at the pinion end; >> the >> shaft inserts into a sleeve bearing that's in turn inserted into the bell >> housing of the engine. That wears and needs renewal. And the solenoid >> gets >> its operating power not from that fat cable but from battery to panel to >> ignition switch and back to the starter. It only needs two or three amps, >> but it's a long trip. It's easy to see if a relay could help it -- just >> jumper the alternator B+ post to the starter control terminal. You can >> reach it by reaching your hand over the top of the bell housing, quite a >> way >> forward and then to the right. There's probably a spare terminal to latch >> on to. If it cranks snappily that way and listlessly by the key, add a >> relay. If it makes no difference, neither will the relay. >> >> Yours, >> David >>
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