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Old 04-21-2018, 11:53 PM   #1
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Default Timing set and valve seals

Need some advice from the motor guys. My plan is to do both of these at the same time. I'm going to remove the old timing chain and use the rope method for the valve seals. Doing this will only move the bottom end during valve seal replacement. Then #1 TDC and put the new timing set in.

Does anyone see any issue with this plan? Any opinions welcomed.
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Old 04-22-2018, 02:26 AM   #2
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I don’t see a problem as long as you have a firm understanding of how to find TDC again on the #1 cylinder after you’re done with the valve stem seals and ready to reinstall the rocker arm shafts. You’ll have to make sure the cam is installed such that the top end is on the compression stroke of #1 as you’re tightening the cam tower/rocker arm shaft bolts.

If will also be a great opportunity to clean any sludge from inside the cam, inside the rocker arm shafts, and inside the rocker arms. I used a syringe and a piece of vacuum hose to force oil into the rocker arms to prime them after I’d cleaned them.
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Old 04-22-2018, 03:53 PM   #3
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As long as the #1 piston is at top dead center and the cam is unmoved everything should still be in time mechanically correct? This should be just like a fresh build even though I'm not removing the head. I've never moved the bottom end when messing with the chain, just making sure my thinking is right. Thanks
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Old 04-22-2018, 10:54 PM   #4
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Yeah as long as you don’t move the crank and the cam is in the same position you’ll be fine.
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Old 04-22-2018, 11:16 PM   #5
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I have to rotate the crank to do the valve seals. Wouldn't I just return the crank keyway to 12 o'clock and set the crank and cam timing per the link and sprocket marks?
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Old 04-22-2018, 11:36 PM   #6
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Yeah basically. I wouldn’t rely on the visual position of the crank keyway. I would use a dowel or screwdriver to feel the top of the piston to make sure it’s at TDC
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