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  #13  
Old 05-13-2011, 05:51 AM
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Re: 02 4.7HO headgasket?

Thanks scjeep, thats what I was eondering. Got most of it off, gotta work but the timing chain cover is the only thing left then off with its head! Sunday. Just info, the compression check was fine but when i had all the plugs out antifreeze shot out of #8! Also there were 3 rocker arms laying under the valve cover, hence the severe miss. Pretty gummy under there, any suggestions on what to clean it with? dont want to do this again!
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Old 05-13-2011, 08:03 AM
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Re: 02 4.7HO headgasket?

The machine shop can clean them real nice for a small fee. Also have them checked for any warping. If one has any warping machine both heads the same amount. If you are not replacing the timing chain (which I would at this point) if you aren't then there is no reason to remove the timing cover.
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Old 05-13-2011, 09:36 AM
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Re: 02 4.7HO headgasket?

So I can remove the head without opening the cover? Theres enough room to pull the chain/sprocket off without doing that? Sweet, give me an idea on how?
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Old 05-13-2011, 11:02 AM
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Re: 02 4.7HO headgasket?

The only sprocket that has to be removed is the ones on the cams themselves.

There is a bolt on each head that has the timing chain tensioner guide held to the head and block which will not let you remove the head until you remove the tensioner from the head, because the other end of the tensioner in bolted to the block.

You have to move the power steering pump out of the way on the drivers side and there is a access cover you pop out and you can remove the top bolt on that sides timing chain tensioner guide. There are two tensioners. You want to remove the lower one on the drivers side and the upper one on the passenger side or vice versa.

The passenger side is very similar so look for the same thing. Once those are removed and all the head bolts, and the exhaust header collector bolts are removed you can pull the head out. I pull mine with the exhaust manifold still on the head. It is a little heavier that way but much easier then trying to remove the exhaust manifold from the head while it is still in the jeep.

Also there is no need to remove the cams to pull the head. If you do remove the cams, Mark the cam caps for direction and placement. They cannot be mixed up or positioned backwards. Most i have seen are numbered but just make sure before you remove the cams.

EDIT: Oh and of course you have to remove the intake manifold first. Drain the coolant also. There are plugs on the sides of the engine i addition to the radiator petcock.
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Old 05-13-2011, 11:41 AM
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Re: 02 4.7HO headgasket?

Excellent! You just saved me a few hours. The book shows the tensioners but says to take the whole cover off, essentially the front of the motor. All is off except the dampner (i didn't get the puller, was gonna rent it after work saturday night) so it's all out of the way already, I even took the bolts off the bottom of the manifold (at the 'Y') because its about impossible to get the manifold bolts out on the passenger side in the truck. PB blaster'd those at the beginning of the job, they came right off! So I'll be sure to mark the chain at the 12 oclock(where the v8 is), but what holds the chain up when you are pulling the head off?
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Old 05-13-2011, 06:16 PM
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Re: 02 4.7HO headgasket?

So the tensioner thats attached toi the block will hold the chain on the lower pulley? I don't want to mess this up, just trying to clarify that when I pull the sprocket off the cam I can let the chain go and it wont fall off the lower pulley? Thanks for your patience.............Scott
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Old 05-13-2011, 08:02 PM
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I zip tied the chain to the cam sprocket in a few places which keep it in three correct position when you get ready to put back together.

Then all you truly need is upward pressure to keep the timing chain tight against the idler sprocket. I used a bungee cord.

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Old 05-14-2011, 05:43 AM
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Re: 02 4.7HO headgasket?

Okay thats exactly what I was asking, thanks again! Then just gotta be sure no-one goes near it until the head/sprocket is back on!
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Old 05-16-2011, 05:55 AM
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Re: 02 4.7HO headgasket?

Yup, that worked! I didn't use a bungee though, I just marked the sprocket in 2 places, zip tied the chain to the upper chain guide as it sticks out into the valve cover, then removed the sprocket and zip tied the chain tight to itself on the guide again. Replaced the head and most of the bolt-ons, gotta work until Wednesday, then I'll finish up, change the oil, fill antifreeze and start it up!
Thanks for your help, I appreciate it
Scott
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