bearbalu Posted December 14, 2004 Share Posted December 14, 2004 On DOHC 2.5 liter interference engines. Does anyone know if it would make valves collide. The endwrench article on timing belt replacement actually suggests rotating crank counter clockwise 90 degrees and then rotating it 180 clockwise (step 23) http://www.endwrench.com/pdf/engine/FtTimingBeltReplaceF00.pdf Link to comment Share on other sites More sharing options...
svxpert Posted December 14, 2004 Share Posted December 14, 2004 EndWrench is a Subaru publication. no reason to doubt the techinical article. Link to comment Share on other sites More sharing options...
mrtoyou7747 Posted December 16, 2004 Share Posted December 16, 2004 If you think about it - the relationship between the crank and thus the pistons and the cam(s) and thus the valves is fixed by the timing belt (why is clled a timing belt) so moving them together in any direction would make no difference Link to comment Share on other sites More sharing options...
NorthWet Posted December 16, 2004 Share Posted December 16, 2004 Actually, there is cause to reflect on whether this might cause a problem. The "timing" relationship depends on the pull side of the belt; when you rotate the engine backwards, there is the chance that the tolerances on the slack side might cause the crank-to-valve relationship to be different. On a tight-tolerance design, this could cause problems. I am NOT saying that this is a problem with this or any particular engine, just that it is good to think and ask first. Link to comment Share on other sites More sharing options...
bearbalu Posted January 2, 2005 Author Share Posted January 2, 2005 Seems like most manuals suggest don't rotate crank counter clockwise...I am not sure why... Link to comment Share on other sites More sharing options...
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