balencer shaft replacement help - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 22 (permalink) Old 07-07-2013, 06:33 PM Thread Starter
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balencer shaft replacement help

OK so if you frequent this part of the forum in another discussion I mentioned that I broke the head off the reverse thread bolt on the flywheel side of the balencer shaft. After putting the entire engine in a drill press, multiple attempts to weld a head on it I have given up on extraction.

Question. Do you have to split the crank case to replace the balencer shaft?
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post #2 of 22 (permalink) Old 07-07-2013, 06:40 PM
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Quote:
Originally Posted by tgell001 View Post
OK so if you frequent this part of the forum in another discussion I mentioned that I broke the head off the reverse thread bolt on the flywheel side of the balencer shaft. After putting the entire engine in a drill press, multiple attempts to weld a head on it I have given up on extraction.

Question. Do you have to split the crank case to replace the balencer shaft?
As I know it - yes...view it here
P/N: 13107-1146

http://www.cheapcycleparts.com/oem-p...750/crankshaft

There must be an Extraction tool for LH threads ! Worth the $$$ / Time

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 07-07-2013 at 06:44 PM.
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post #3 of 22 (permalink) Old 07-07-2013, 06:54 PM
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Left Hand Extractor

Google it, You will come up with several options. They are available.
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post #4 of 22 (permalink) Old 07-07-2013, 08:20 PM Thread Starter
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I have a tap and dye set. Easier said than done. Even have a cobalt bit that does very little to screw, hole isn't straight (even when I put the engine under the drill press) cuz you have to press so hard the bit bows
I really don't know what else to do except replace the shaft or scrap the project all together.
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post #5 of 22 (permalink) Old 07-07-2013, 08:36 PM
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A self tapping bolt/screw would work as a left handed extractor. if you need a new shaft I have one from my parts motor yet.

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post #6 of 22 (permalink) Old 07-07-2013, 09:04 PM
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Im at this point too, got the covers off, gaskets cleaned off just need to pull the rotor and gear over the balancer I believe, but the thought of renting the pullers and chance busting a bolt I'm tempted to put the covers back on and fix the oil leak I pulled the engine for in the first place and ride it till it slings a balancer through the case. it was not vibrating nor did I have chunks in my oil. any thoughts?

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acct to mcct mod https://www.vn750.com/forum/showthread.php?t=17917

rekeying locks, https://www.vn750.com/forum/showthread.php?t=7309

stator replacement walkthrough, https://www.vn750.com/forum/showthread.php?t=11369
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post #7 of 22 (permalink) Old 07-08-2013, 04:18 AM
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Here are my thoughts. Yes you will need to split the cases to change the balancer shaft, but, it is quite straight forward. You also get to inspect the oil pump chain and with a little work you can inspect the oil pump rotors. you can also clean the sump and inside of the cases, replace the base gaskets (they can be suspect and leak coolant). You get to check the bores, pistons ,rings, main and bearings.You can inspect the inner gear shaft and all the gear shaft washers and circlips. You can inspect the water pump inner bearing. you only need a puller for the alternator rotor and a bolt will do that if you don't want to get the type you hammer round (I got the hammer round type from ebay, not expensive and worked beautifully ). They are not that complicated as motors go, do your homework and read the manual. You just need to be methodical and get the cam timing procedure straight in your head before put it back together. Trust me, once you have done it all you will feel very pleased with yourself and will have a lot more faith in your motor.

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post #8 of 22 (permalink) Old 07-08-2013, 08:59 AM Thread Starter
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Thinking about buying motor off ebay. They have one posted right now for like 800 with shipping out of a 95 w/ 11K miles on it. Then rebuilding the one i have now at my own leisure and either swapping out motors when i'm done or getting another bike w/ a blown motor and putting it in that. I just am afraid that a purchased used motor will have a bad head gasket too (or something else wrong) and i'll be right where i started and in the hole even deeper.

Just want this thing to be up and running dont have a ton of free time or money. Frustrated that my project came to a screeching hault because of this one epic mistake. Was going well too just prior haha
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post #9 of 22 (permalink) Old 07-08-2013, 09:15 AM
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Like others have said, a standard RH bolt/screw works like an easy out on LH threads. If you're bowing the drill bit, it's either dull our just too small for the application. You might have better results using a bigger bit/tap combo. With hardened steel, unfortunately, you have to be patient and can't lean too hard on it.

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post #10 of 22 (permalink) Old 07-08-2013, 12:10 PM
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get a good expensive bit that doesnt dull easy then drill slow with a lot of pressure once your hole is all the way thru the bolt spray pb blaster in the hole and wait ten mins then get a torx head bit and using a hammer drive it into the hole and with a bit of effort it should come out

i just did this with mine and it worked great

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