I replaced the water pump on my 1989 740 GL (16 Valve). I thought I had dropped the nut on the water pump that is over the lower timing belt cover into the cover. I used the "rope trick" to lossened the bolt that holds the crankshaft pulley in place enough to allow the nut to fall out of the bottom of the lower timing belt cover - it wasn't there. I then tightened the nut on the crankshaft and torqued it to 44 ft/lbs + an additional 60 degrees.

Now the crankshaft pulley woobles - I just pulled it foward about 1/2 inch perhaps a much as 3/4 of an inch. Could this cause the wobble in the pulley? How do I correct it.

Thanks in advance for your help.

Wally

...when bolt was tightened. The notch on the back of the pulley (see pic 1) was not seated on the crank sprocket "nib" (see pic 2)
Loosen the bolt, reposition the pulley, and torque the bolt again.

Pic 1


Pic 2



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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Thanks Lucid - I'll reposition the pulley tomorrow. I didn't realize there was a notch on the back of the pulley. The pictures you included make your explain easy to understand.

Wallym

I followed the advice I received from Lucid last night and now the pulley rotates without wobbling. Had to use a hammer to remove the pulley. I read some of the posts that said to line up the slot in the pulley with the "nib" in the crank sprocket and rotate the pulley until you feel it seat on the nib of the crank sprocket. No way could I twist pulley - I needed to hammer it into place - lucky first try it seated correctly. Should I have put some grease or other lubricant in the center of the pulley so I could rotate it into position instead of hammering into place?

You may have nicked the shaft or the inside of the pulley when you torqued it when it wasn't seated correctly and had a small ridge. If the timing is right and it runs good, you're okay. Fortunately when it wasn't seated it didn't spin on you and jump time. Your motor is an interference engine. It could have been expensive.
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"Fortunately when it wasn't seated it didn't spin on you and jump time."

If the pulley had slipped and spun, the timing belt wouldn't be affected. But the timing notch on the pulley's front edge would no longer be synced to the crank sprocket and belt. So the ignition timing would appear to be off if a timing light was used.


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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Duh..you're dead on....
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