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850 Valve Job, New head Bolts or Not 850

posted by  someone claiming to be Tim on  Sun Apr 22 01:58 CST 2007 [RELATED]

Removed the head on my son's '96 850 with no compression in #1 cylinder to find a burnt valve. Question is are people replacing the cylinder head bolts when you are doing a valve job. Haynes says new bolts but then again they want you to replace every bolt when taking things apart.

what have bricksters been doing.








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850 Valve Job, New head Bolts or Not 850

posted by  dick on  Sun Apr 22 10:26 CST 2007
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last visit: Sun Aug 3 15:24 CST 2014
[RELATED]

Yes, replace them all with new ones. These are 3 stage tightening bolts. Two different levels of torque followed by a 130 degree pull. This has the effect of weakening or streatching the bolt rendering it questionable. I just did a head job on son's S-70 and the bolts are expensive but makes me feel good as I did not want to break one off. I used Volvo bolts buy fcp groton has new ones which are most likely less expensive.

Good luck and have fun,

dick







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