need help with dads truck kinda urgent

2.8broncoII · Oct 2, 2009

its a 98 f150 4.6 ohc
ok so we had the head off to do the head gasket. we maked the timing chain up at the head and also marked the sprocket. put all the new parts in went to turn it over heard a few knocks then it stopped turning over.

is there any was the timing could be off if we lined the marks up? we never moved it from the crankshaft sprocket so i dont see how the chain could be off? the motor did get spun around the wrong way while installing pulleys and things. does that matter?

i would just like you guys opinions on how the valves could be hitting the pistons. also we only hit 2 of the valves and not hard, we were just bumping the starter. think we hurt the valves? i wouldnt think so.

sorry for long post, all help appreciated.

thanks

dan

kemicalburns · Oct 8, 2009

gonna have to pull it apart and inspect.

fordwheelinman · Oct 30, 2009

if you spun it backwards, the chain had no tension on it from teh tensioner being removed for head removal. This could have caused that heads timing gear to skip teeth and give you the condition you have now. Best i can tell you is pull it apart, reset the timing, then do a compression check after the covers are back on with no accessories. Just "bumping" the start shouldnt have hurt anything, but then again anything is possible.

Nater · Oct 30, 2009

Yes, bumping the starter while it is out of time will cause problems.... This is the reason my 5.4L swapped Mustang is down now....4 valves were completly snapped when they smacked the pistons. Most likey the knocks you heard was the pistons and valves making contact. You definately need to pull the head off again! I hope that you are not in the same situation I am currently in...

need help with dads truck kinda urgent

2.8broncoII

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kemicalburns

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fordwheelinman

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Nater

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