Subject	Someone would have to do some analysis on the metal.
Posted by	Red Hawk (CO) on February 18, 2016 at 5:21 PM
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In Reply To	The washers were stacked. posted by ILoveBoost on February 18, 2016 at 03:11 PM
Message	But what is happening is we are reaching a stress in which the aluminum is actually yielding, and assuming the head are not some super cheap grade of aluminum, that is some decent force. The force required for a metal to deflect vs. yield can be pretty significant, it does not surprise me at all that the washers deflected enough to cause a head gasket failure without showing further aluminum yield. Like Greg said, if this happens, the only way to fix the issue is to have the heads machined, there is no Band-Aid fix.
Follow Ups	PSA RE: Head Washer Size / Head gasket Failure - Greg D. (Specialty-Z) 14:50:42 02/17/16 Re: PSA RE: Head Washer Size / Head gasket Failure - Bad Fish 15:09:15 02/17/16 Re: Re: PSA RE: Head Washer Size / Head gasket Failure - Greg D. (Specialty-Z) 15:38:11 02/17/16 wow (n/m) - LJZTT 15:59:46 02/17/16 2nd. (n/m) - spicyZ 08:41:29 02/18/16 yeesh! that's ugly. (n/m) - Dallas DamonZ 16:07:39 02/17/16 Great find Greg, I would like to add... - Red Hawk (CO) 16:11:49 02/17/16 Yikes! Thanks for the post. Glad I switched to stock - MixManMash 17:05:30 02/17/16 Glad I used Z1's upgraded washers on both my engines. - ForceFedTT (SoCal) 20:27:13 02/17/16 Interesting - Ashman2k2 14:00:25 02/19/16 EP Racing posted this a few years ago (n/m) - toykoz32 21:06:11 02/17/16 Although this makes sense to me, so - ILoveBoost 08:41:34 02/18/16 Thank You for the knowledge sir!!!!! (n/m) - NUTTZ(EPTmotorsports) 10:09:53 02/18/16 Re: Although this makes sense to me, so - Placuch 14:21:47 02/18/16 The washers were stacked. - ILoveBoost 15:11:32 02/18/16 Where do you read the washer are stacked?? (n/m) - itsa300zx 16:10:52 02/18/16 I worked on the car after the first HG let go, - ILoveBoost 16:56:21 02/18/16 Someone would have to do some analysis on the metal. - Red Hawk (CO) 17:21:20 02/18/16 Have dimensions? - BlackholeZ 12:49:44 02/19/16 I do have a spare set of z1 washers, no small arp ones tho - Red Hawk (CO) 15:33:31 02/19/16 What is the OD of the Z1 washers? How much larger than OEM? (n/m) - ZXoltan 15:39:39 02/19/16 We have similar issues on MR2s. - dogpile 13:55:09 02/18/16 Similar issues on Miata as well. (n/m) - ztunerz 23:40:06 02/18/16 Curious if you have any data on the required torque to - Ashman2k2 13:38:20 02/19/16 Why would washer OD affect preload? - ZXoltan 15:38:45 02/19/16 Torque is torque. Washer size just spreads the force - BlackholeZ 23:27:31 02/19/16 I'm pretty sure that Ash is talking about.... - tiale11 06:54:15 02/20/16 Correct. Using the matching flange nut to larger OD washer - Ashman2k2 22:36:48 02/20/16
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