[luke4010]

[quote=”EricTheCarGuy” post=162190][quote=”luke4010″ post=162179]Eric, I seem to remember something I read when I was replacing the 4.7 V8 in my friend’s 2002 Grand Cherokee about how the 4.7 can’t be turned over by the crank pulley, only with the starter. I believe they said it was because of the three timing chains since the 4.7 is OHC. What happens when you try turning it over with the starter?[/quote]

I don’t know of any engine that can’t be turned over by the crank. Think about it, how would that be possible? If you can’t rotate it, the starter sure can’t.

This engine has a mechanical issue that won’t allow the engine to rotate fully. It DOES rotate, it just reaches a point where it stops. Turn it the other way and it will rotate till it stops again.

Some suggested a valve seat that may have dropped out. I think that might be plausible. Worth looking into anyway.[/quote]

That makes sense. I just remember reading that somewhere, my bad. The valve seat dropping is a VERY common problem on these 4.7s. That was the problem with my friends engine. The 3rd cylinder dropped a valve seat. It still started and ran though, just ticked like crazy and wouldn’t fire on the 3rd cylinder.

[luke4010]

Eric, I seem to remember something I read when I was replacing the 4.7 V8 in my friend’s 2002 Grand Cherokee about how the 4.7 can’t be turned over by the crank pulley, only with the starter. I believe they said it was because of the three timing chains since the 4.7 is OHC. What happens when you try turning it over with the starter?

[Author]

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