Merle Coggins Posted March 16, 2019 Report Share Posted March 16, 2019 Both #1 and #6 pistons are at TDC as you state. Both tappets loose on #1 indicates that this cylinder is at the top of the compression stroke. This means that #6 is at the top of the exhaust stroke, which puts the valves in an ‘overlap’ condition. The exhaust valve is closing and the intake valve is opening. Depending on the valve timing of this particular engine the exhaust valve could have just closed, allowing the tappet to be loose, but the intake valve is probably beginning to open, hence the tight tappet. 1 Quote Link to comment Share on other sites More sharing options...
maok Posted March 17, 2019 Report Share Posted March 17, 2019 And if you turn the engine back and forth past TDC , you will find that #6 inlet and exhaust valves will open and close accordingly, ie. tighten and loosen on the tappets. This should confirm that your timing chain is installed probably correctly, could still be off by a tooth but unlikely. 1 Quote Link to comment Share on other sites More sharing options...
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