Turning the crank by hand?


Information and questions on GL1000 Goldwings (1975-1979)
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98wingman
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Turning the crank by hand?

Postby 98wingman » Mon Jan 11, 2010 7:00 pm



I was told there was a method of turning the crank with a wrench on my '79 GL1000 (no kick starter since it is a '79) without tearing things down. The engine is stuck and I am trying the Marvel Mystery oil treatment but don't know where I can turn the crank. Any suggestions?



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Re: Turning the crank by hand?

Postby WingAdmin » Mon Jan 11, 2010 9:09 pm

Whatever you do, don't try to do it using the pulley on the front of the engine - you'll run the risk of loosening it off.

First, remove the spark plugs, so you aren't fighting against compression.

Now, there's two ways of doing it. First, you can put the bike in fifth gear and turn the rear wheel.

Second, you can remove the small cover from the back of the engine, insert a 12mm socket, and turn the engine this way.

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Re: Turning the crank by hand?

Postby Old Fogey » Fri Jan 22, 2010 10:31 am

Since the engine turns clockwise, from the front, there is no harm in turning it using the front crank bolt. The rear cover Admin talks about is the one on the back of the alternator housing. The bolt inside holds the alternator rotor on. Again, make sure that is is only turned clockwise from the back or you risk loosening off the bolt with disastrous consequences for the stator.
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Re: Turning the crank by hand?

Postby WingAdmin » Fri Jan 22, 2010 1:40 pm

Old Fogey wrote:Since the engine turns clockwise, from the front, there is no harm in turning it using the front crank bolt. The rear cover Admin talks about is the one on the back of the alternator housing. The bolt inside holds the alternator rotor on. Again, make sure that is is only turned clockwise from the back or you risk loosening off the bolt with disastrous consequences for the stator.


You can't turn the engine clockwise from the back AND the front! :) The engine rotates clockwise from the rear, which is why you turn the rotor clockwise:

Turning engine from the rear
Turning engine from the rear


However, viewed from the front, the timing belt pulley turns counter-clockwise. So if you attempt to turn the engine using its bolt, you risk loosening the bolt off, which is very bad.

So use the rear rotor to turn the engine over and you'll be OK.

Or, put the bike in fifth gear, and slowly rotate the rear tire forwards.

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Re: Turning the crank by hand?

Postby Old Fogey » Fri Jan 22, 2010 2:14 pm

Sorry, you are wrong!
The engine turns clockwise from the front! The rotor turns clockwise from the rear. It turns in the opposite direction to the engine because it is geared directly to the crankshaft!
It was designed this way by Honda to minimise the torque reaction which due, to the longitudinal positioning of the engine, would tend to rock the bike sideways.
If you don't believe this, remove the timing and alternator covers, put a 12mm wrench on the alternator bolt and turn the engine by the crank pulley bolt clockwise. The wrench will also then move clockwise! You can also watch the timing marks come into view as you go clockwise.
Trust me, I really do know what I'm talking about.

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Re: Turning the crank by hand?

Postby WingAdmin » Fri Jan 22, 2010 3:09 pm

Of course, you're absolutely right. I completely forgot about the gearing of the stator rotor - which is obvious, when you look and realize that the rotor is offset from the crankshaft.




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