Question about 2005 Mazda 3

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I want to replace Head Gascet, but have to remove Cam chain. How can I do it? I also want to remove Crank Pully. Bolt very tight.

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Crank Pulleys are generally removed with an impact wrench connected to an air compressor.

I don't have data for replacing the head gasket on the 2005 Mazda 3, but one might try Alldata.com, but it will cost.

Posted on Sep 02, 2010

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WHEN REPLACING THE HEAD GASKET.


Yes, the chain has to come off. The cam gear that is driven by the chain is mounted on the cam, inside the head, and the crank pulley down at the bottom is what drives it via the chain. The chain has to be removed in order to remove the head.

Usually the pulleys are mounted onto their shafts with a bolt through the center of each pulley. That will have to be loosened and removed (which is much easier if it's loosened before you remove the chain, so that the chain holds the pulley still and keeps it from moving). My question is, why do you need to remove the pulley? Once the chain is off, and everything else is disconnected, the head will lift off with the pulley intact, and the crank pulley doesn't need to come off as it has nothing to do with a head gasket service. Is there another issue that requires the pulley to come off, or are you replacing the head with one whose cam pulley is missing?

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