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Re-Tourquing Head Bolts

 
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sailingphotag



Joined: 11 Jul 2000
Posts: 332
Location: lugoff sc

PostPosted: Thu Aug 23, 2001 2:43 am    Post subject: Re-Tourquing Head Bolts Reply with quote

Hey, dont do it.peroid. cause the bolts arnt set at a specific value rather torqued to a number then spun a number of degrees....also your car most likly has hex head bolts if this is tthe case lots of people recomed replacing them...jeff
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charliesmith



Joined: 07 Jul 2001
Posts: 738
Location: Dallas, Texas

PostPosted: Sun Aug 26, 2001 2:47 am    Post subject: Re-Tourquing Head Bolts Reply with quote

I agree with Jeff. If your engine still has the hex head bolts, they are failure prone. Get rid of them. Seems the hex bolt heads have a tendency to pop off. Best case is a blown head gasget. Worst case is many 528e owners must replace the head assembly after a hex bolt head pops off and gets lodged under a cam lobe and mashed into the water jacket destroying the head and subjecting the timing belt to severe stretching trauma.

For ~$30 you can purchase a torx head bolt kit (14 bolts) from your local BMW dealership. Check the earlier bulletin board postings as several owners have reportedly installed the torx head bolts without removing the head. If you elect to replace the hex bolts this way, REPLACE AND FINAL TORQUE ONE TORX BOLT AT A TIME using the maintenance manual head bolt torque + degree procedure and criss-cross pattern. Remember, the torx bolts are torque-to-yield. Once torqued (stretched) they cannot be reused.

If your engine already has the torx head bolts installed, my years of experience tells me to leave well enough alone.

Good Luck

Charlie Smith
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