Engine will not turn over
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Engine will not turn over
Hello everyone! I am working on a 2000 f-150 XLT 5.4L 4x4 Automatic. It tries to crank over but acts like its stuck. things done: New starter, new battery, fixed connections. I can turn the crank counter clock wise but won't turn clock wise. Not sure if i should say the engine is bad or could trans be stuck? Heard 5.4L's have timming chain issues. Is that true? Point me in a direction and i'll go forth.
Brian.
P.S. if i messed a post on this i apologize.
Brian.
P.S. if i messed a post on this i apologize.
More Turbo
Joined: May 2014
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Regardless of the transmission, you should be able to turn the engine over by hand with a socket & breaker bar/BIG ratchet in either direction. If it won't turn over easily with a 1-2ft ratchet, something is massively wrong. Please keep in mind that these are INTERFERENCE ENGINES so valve damage will occur should the timing chain let go.
It sounds like one or more valves are not opening and the piston(s) are hitting them. Since the starter only puts out 1.4 Kw (1.877 hp), it doesn't have the muscle to shred through it like if the engine were running, so it just stops as you are experiencing.
With all of the plugs out, have a friend turn the engine over by hand as you observe each piston's motion one at a time untill the engine stops like you say it is doing. The culprit one will be hitting near the top of its stroke when the engine refuses to turn over further. An inspection camera/boroscope would come in handy for the rear four cylinders
It sounds like one or more valves are not opening and the piston(s) are hitting them. Since the starter only puts out 1.4 Kw (1.877 hp), it doesn't have the muscle to shred through it like if the engine were running, so it just stops as you are experiencing.
With all of the plugs out, have a friend turn the engine over by hand as you observe each piston's motion one at a time untill the engine stops like you say it is doing. The culprit one will be hitting near the top of its stroke when the engine refuses to turn over further. An inspection camera/boroscope would come in handy for the rear four cylinders
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so you think the timing chain let lose in the engine? that makes a lot of sense. so if that is the case, what would you do next? i was looking at used engines on Car-Part.com--Used Auto Parts Market ( all salvage yards in my area that are computerized) or would you get used heads and do a timing chain?
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From: Illinois
so you think the timing chain let lose in the engine? that makes a lot of sense. so if that is the case, what would you do next? i was looking at used engines on Car-Part.com--Used Auto Parts Market ( all salvage yards in my area that are computerized) or would you get used heads and do a timing chain?
it could be you have a leaking intake gasket that has allowed coolant to fill one or more cyl. removing the plugs gives the water somewhere to go.
new intake gaskets are cheaper and easier than engine replacement.
though it could also be a crack in the block or heads that's causing the leak.
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i'll try that. thank you. the coolant in the cylinder makes sense. it will turn one way and not the correct way.
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Remove the serpentine belt to eliminate accessories first. projectSHO89.
You were right! it was the AC compressor. Locked up tighter that a virgin on prom night! lol! But i pulled the plugs first. that is a job! Thanks for everyone's input.
You were right! it was the AC compressor. Locked up tighter that a virgin on prom night! lol! But i pulled the plugs first. that is a job! Thanks for everyone's input.
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From: South Jawja
Wow, glad you found your problem, even though that would have been one of the last things I would have suspected due to the fact that it is driven by an electrically activated clutch that shouldn't have been engaged. And if the clutch and compressor were seized I would have thought it would have provided the same amount of resistance in either direction of rotation. We all live and learn. 
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From: St. Petersburg, Fl
The OP had a locked up AC compressor. "guyina4x4" was just explaining why he could turn it 1 way and not the other.
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From: South Jawja
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From: St. Petersburg, Fl
