What A Harmonic Balancer Does - Saab 900 Bulletin Board - Saabnet.com
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What A Harmonic Balancer Does
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Posted by JD From LA (more from JD From LA) on Sun, 18 Mar 2001 22:41:32 Share Post by Email
In Reply to: It's a special kind of crackshaft pulley, Fimum Fit, Sun, 18 Mar 2001 15:35:28
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Mathias:

When the fuel-air mixture is ignited and the piston starts back down the cylinder, it's like hitting the crankshaft with a ball-peen hammer. Without the "harmonic" balancer, the crank would ring like when a wrench hits the garage floor. That ringing could start stress cracks in the crank, especially when you consider a combustion stroke occurs 25 times in each cylinder at 3,000 rpm.

The rubber surround and the mass of the pulley dampens the ringing like putting your hand on a ringing bell. However, there are better designs out there. SAABS have had a problem with the rubber parts separating from the steel parts for thirty years at least.

That's the main reason for replacing the harmonic balancer/front crank pulley on a SAAB. the other reason is the crankshaft oil seal located in the oil pump wears a groove in the balancer where they make contact so it leaks even with a new seal. However, if the wear is slight, a new seal will take care of it.

JD

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