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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Rcgreaves on November 07, 2016, 10:15:27 PM
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Twice today I needed to drop the bike in gear rock the bike to get the starter to engage. What's the common fault? What should I expect to R+R?
Just add it to my growing list of winter projects... :musicboohoo:
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See http://www.motobrick.com/index.php/topic,2272.0.html http://www.motobrick.com/index.php/topic,5678.0.html http://www.motobrick.com/index.php/topic,4087.0.htmlhttp://www.motobrick.com/index.php/topic,5933.0.html it is a known problem with easy fixes.
Regards Martin.
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Dump a full can of engine cleaner like SeaFoam in the crankcase. Do a backspin to get it started and go for a ride, 20-30 miles should do the trick. Drain the oil, change the filter and refill with a high detergent diesel motor oil like Rotella T6. Did that on my K100 last spring, and 6000 miles later I haven't had anymore sprag issues.
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Drain the oil, change the filter and refill with a high detergent diesel motor oil like Rotella T6.
Have a cup of Ovaltine, too. Do you mean the starter spins but won't engage, the starter won't spin or what, Rc?
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Laitch et al: Starter sprag-- I remember reading that in the manual... to clarify, I depress the start buttom I hear the relay click.....no spin. roll it 10 feet drop clutch ( I suspect this re positions the brush on a dirty or faulty starter motor commutator and presto, engage starter switch, and it spins/starts engine. intermittent problem. I can put up with this for awhile pre snow. Nothing here that will strand me by the roadside... I'll review the youtube video from Martin, Thanks Martin. sounds like the starter brushes are contaminated or worn out.
I'm having another electrical issue but I'll post it separately. I recently traced and replaced load shed relay in another recent closed thread... when the headlight stayed on even with key off. new load shed relay..check.. Now reassembled, the headlight is randomly turning off while rolling down the road, in fact everything on the instrument cluster goes black. Pretty spooky the other morning heading off to work at "zero dark thirty" and poof no headlight on a no moon night... :mbird flickered on and off enough for me to limp it home to the garage and replace it with 4 wheels for my commute.
Just an added note about this flickering headlight- I removed side cowl fairings and "thwacked/wiggled all the connectors ahead of the headstock ie headlight, blinkers, instrument. No readily apparent loose connections.
I seem to be ramping up a gaggle of electrical gripes that may or may not be related. Isn't there a system that when it sees too low voltage shuts things down ( maybe the load shed relay??) Last night I put a trickle charger on it to see if the headlight poltergeist is chased by a peaked battery. In any event I'm suspicious of the battery and alternator systems. I had plans to roll the K 75 north to St Paul this weekend, but I'll have to use a car alas, these issues are too spooky to be tested on a night ride out of town. Time for work!
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You're describing some of the symptoms of a failing starter. Consider a thorough overhaul or replacement of the starter. Be sure that all leads, ground and mounting bolts are attached and secure first.
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Starter brushes. Also goes along with the headlight not coming on or lights flickering. Happened to me before and I'd bet money that's the issue you're having. When you order at the dealer make sure you buy both brushes...the "kit" does not have both (there's two brushes)
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:clap: great help but it will have to wait. Borrowing a friends cycle to get the last gasp of fine fall riding in and around St Paul tomorrow and Sunday.
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saving for brushes
found this that precisely described my symptoms.
http://www.motobrick.com/index.php/topic,7630.0.html
I have yet to study my manual or view the youtubes but do I need one set or two?
http://www.euromotoelectrics.com/Starter-repair-kit-for-Denso-Starter-BMW-K-p/bmw-strk007tk.htm
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rebuilding starter, stay tuned.
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searching for narrow puller for bearing and slide hammer for bushing. Oil seal came out tonight so the day is not for naught!
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For the starter? I'd just add a little grease to it and swap out the brushes dude
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In hindsite I certainly wish I had taken the advise of F14crazy.... the rebuild kit comes with all these nice new bits so why not replace them all...well because they're a bitch to remove.... that's why dumb !#s!
So I purchased a seal puller and that came out cleanly ..check.. Next a slide hammer for the bushing which admittedly shows little or no sign of wear etc..only a tiny healthy deflection with the shaft seated... Only when I insert the double hook puller to put in a fresh one it doesn't budge .
So I move on to the bearing which whilst smooth- the roller cage is covered with goo...that's a technical term for a good working dirty part.... when I go to pull it no puller clears the armature a mere 1/4" away so I buy a low profile puller ( translation "cheap") grind the jaw to clear the armature sort of... and manage to slightly ding the armature coating in several places and bend the puller arms.
First question today is can I touch up these abrasions with say a smear of hot melt glue?
So I pulled on the bearing enough to distort the jaw...yeah this bearing is not coming off anytime soon....only on more careful inspection there appears to be an E clip around the shaft between the bearing and armature. That didn't show up in the manual :mbird
Is that retaining the bearing or is it serving as a travel stop?
So in sum: a reman starter is about $100 and I've dropped $60 so far... I've marred the armature coil wire but only cosmetically. I've marred the bushing but everything goes together the same. Id like to use all the bits I paid for, but at this point I'm ready to as f14crazy suggested, just clean, lube, and install the brushes to at least before the year ends tonight, know if my headlight will stay on.
Advice?
Cheers. Happy New Year.
PS- buying a Brick was the highlight of my 2016.
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Hot glue will melt, try a two part epoxy.
Regards Martin.
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So I made some starter progress today and had a satisfying life experience to boot....All part of the adventure with a classic bike right?
So I touched up my dinged coating on the armature with epoxy..check. e clip is a travel stop only so off to find a proper puller.....
Next I dropped by my local auto repair shop Haase Auto in greater metro Montfort WI population 600ish for help or advise... he directed me to an Amish fellow out in the country but only 5 miles from my home.
Lavern the charming proprietor of an auto electic shop emerged from the shop with a lovely locking puller that made quick work of my bearing swap. check. And no the E clip behind the bearing doesn't need to be touched, it's just a stop to keep the bearing away from the armature....glad I didn't dork that up... Next the shaft bushing was pulled on his press... adn the new shiny replacement pressed in its place check....original was still snug after 105k but hey, a new one came with the kit and I'm determined!
"So what's it worth to you"? He asked after a 15 minute how do you do chat.... my reply? Priceless. "How's $5 sound?" My reply "$20 sounds better". He would only take my fiver and once again I discover a hidden gem in a sea of corn fields. I'll be back.
The weatherman forecast 46 for today so I was motivated to work on the brick, but 33 and rain was what I got.
By Saturday we may have a true break in the weather here and a chance to test if failing brushes have been the verifiable source of all this hassle. Cheers.