Tron Posted January 9, 2020 Share Posted January 9, 2020 Valve adjustment procedure on 2002 AI350 when #1 TDC is not known, flywheel has marks 1-6..2-5..3-4..always told when 1-6 are on pointer and #2 cylinder exhaust valve is open..#1 is then at 30%ATC..then start adjustment at #1 Intake and Exhaust... is that right? Quote Link to comment Share on other sites More sharing options...
OldRedMack Posted January 10, 2020 Share Posted January 10, 2020 We have always gone off the flywheel and done it 1 at a time working our way around. Pain if your doing it by yourself, but I would rather only do it once. Quote Link to comment Share on other sites More sharing options...
fjh Posted January 10, 2020 Share Posted January 10, 2020 6 minutes ago, OldRedMack said: We have always gone off the flywheel and done it 1 at a time working our way around. Pain if your doing it by yourself, but I would rather only do it once. AGREE ! Doing it once is best! Valve set 1-6 2-5 3-4 on those marks in engine rotation in firing order! Getting up and down 6 times is better than the alternative ! Just sayin! Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 10, 2020 Share Posted January 10, 2020 (edited) 3 hours ago, Tron said: Valve adjustment procedure on 02 AI350 when #1 TDC is not known, flywheel has marks 1-6..2-5..3-4..always told when 1-6 are on pointer and #2 cylinder exhaust valve is open..#1 is then at 30%ATC..then start adjustment at #1 Intake and Exhaust... is that right? In general, you'd put an engine at 1-6, and intake / exhaust rockers should be loose for either 1 or 6. The loose rockers indicate that the cylinder is at TDC, and you adjust the valve lash on that cylinder to tag specs. If the valves were set too tight last time or the engine is still hot then there may not be any valve lash, but one of the springs on the other cylinder for the paired number should be partially depressed. Thus, you figure out who is at TDC. Older Mack's the firing order is cast into the side of the block, not sure about newer ones. Start with whoever is at TDC and continue through the firing order from there. Edited January 10, 2020 by JoeH Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 10, 2020 Share Posted January 10, 2020 I was always taught to rotate the engine the last few degrees to TDC in the same rotation that it turns when running so that all the timing gear lash is taken up "properly." Quote Link to comment Share on other sites More sharing options...
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