Bent pushrod? 2004 4.7L WJ - JeepForum.com

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post #1 of 20 Old 11-24-2013, 12:43 PM Thread Starter
three_jeeps
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Bent pushrod? 2004 4.7L WJ

Temps dropped into teens and my water pump died. Not having garage to work in, I took car to local mechanic. After R&R of the pump, he tells me he thinks I have a bent rod - hears too much tapping/slop in valves...says this is 'common' on the 4.7L mine has 85K miles on it.
My brother has identical car/engine. I listened to both...I can't hear a difference.
So,1) how does one diagnose a 'bent rod' w/o tearing off the valve covers and removing the push rods?
2) what would be the most likely cause of bent push rod? (for this version of engine?)
Things in know of include sticking valve, sticking lifter, wear on the arm, and fuel hydrolock...but...this engine has never been abused, maint on plugs, oil chg, etc done on schedule (5K oil, 30K plugs)...

Aside from a 2nd opinion, I want to be a little smarter about this, so any experience info would be really useful

I even hate to ask....price range to R&R?

Thanks
j

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post #2 of 20 Old 11-24-2013, 01:11 PM
Darnice
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4.7 does not have pushrods. it's a ohc engine.
Is it a ticking noise? The 4.7 "growls" a bit, thats normal.

Ticking, if you can't tell the diffence is just the injectors firing.

Did it overheat? Did he blead all the air out of the system.
Considering he did not know it has no pushrods, doubt he has much experiance with the 4.7
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post #3 of 20 Old 11-24-2013, 01:14 PM
wconkle
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?
I guess you could start with the info that there aren't pushrods in this engine. Here is a photo of my heads:

img_2230.jpg

And here is a link with some good description of the engine.

http://www.allpar.com/mopar/47.html

I would recommend getting another opinion before you authorize or begin any work!

Wes
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post #4 of 20 Old 11-24-2013, 01:28 PM
car5car
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Did your mechanic say pushrod or rod?
If he said rod, he could mean connecting rod, bent connecting rod is result of water in cylinder.

01 XJ 2wd 4.0
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post #5 of 20 Old 11-24-2013, 01:29 PM
car5car
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Quote:
Originally Posted by wconkle View Post
?
I guess you could start with the info that there aren't pushrods in this engine. Here is a photo of my heads:

Attachment 866730

And here is a link with some good description of the engine.

http://www.allpar.com/mopar/47.html

I would recommend getting another opinion before you authorize or begin any work!

Wes
You bought that fancy chain tool? I used rope, it worked fine for me.

01 XJ 2wd 4.0
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post #6 of 20 Old 11-24-2013, 02:38 PM
doorjamm
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Quote:
Originally Posted by car5car
You bought that fancy chain tool? I used rope, it worked fine for me.
Not to steal a thread, but what is the chain tool/ rope used for? I rebuilt my 4.7 from the ground up and didn't use anything like that, so I'm curious
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post #7 of 20 Old 11-24-2013, 03:37 PM
Bandit84
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I'd look for a different mechanic..

85' CJ7
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post #8 of 20 Old 11-24-2013, 04:57 PM Thread Starter
three_jeeps
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Quote:
Originally Posted by Darnice View Post
4.7 does not have pushrods. it's a ohc engine.
Is it a ticking noise? The 4.7 "growls" a bit, thats normal.

Ticking, if you can't tell the diffence is just the injectors firing.

Did it overheat? Did he blead all the air out of the system.
Considering he did not know it has no pushrods, doubt he has much experiance with the 4.7

Whoops, yes, very clear, it is a OHC engine.

Thank you!

Yes, it did overheat...once. Hope it didn't damage the head gasket...
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post #9 of 20 Old 11-24-2013, 06:34 PM
86cj74.2L
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Their is a air pump operated by vacuum that makes a pretty loud tapping sound. Its mounted on the drivers fender. You can't miss it.

Put your hand on it and you will be able to feel the tap. If its in time with the engine noise forget about it. That's what I did.

On a side note my work partner has a old ford ranger. When you tell him his engine is making noise. He says its made that same noise for 20 years. When it stops he will worry.
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post #10 of 20 Old 11-24-2013, 06:39 PM
99_wj_QD
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definitely get a different mechanic, a better mechanic...I am a mechanic and let me tell you straight up, if you had a bent rod you would know because that engine would not run right, at all!

the ticking noise is actually lifter tick, it is very common with the non adjustable hydraulic lifters that are used in many engines including the 4.7L...the only way to fix that tick is new lifters but honestly lifter tick is normal and no big deal.
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post #11 of 20 Old 11-24-2013, 07:56 PM
gcjeeping
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Originally Posted by 99_wj_QD View Post
I am a mechanic...
That didn't take long.
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post #12 of 20 Old 11-24-2013, 08:47 PM
doorjamm
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Quote:
Originally Posted by gcjeeping

That didn't take long.
Hahahahahahahaha
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post #13 of 20 Old 11-24-2013, 09:01 PM
car5car
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Quote:
Originally Posted by doorjamm View Post
Not to steal a thread, but what is the chain tool/ rope used for? I rebuilt my 4.7 from the ground up and didn't use anything like that, so I'm curious
You can see the tool on his picture, it holds chains on intermediate sprocket.
It took me awhile to figure out how to install chains w/o it.

01 XJ 2wd 4.0
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post #14 of 20 Old 11-24-2013, 09:04 PM
car5car
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Quote:
Originally Posted by 99_wj_QD View Post
definitely get a different mechanic, a better mechanic...I am a mechanic and let me tell you straight up, if you had a bent rod you would know because that engine would not run right, at all!

the ticking noise is actually lifter tick, it is very common with the non adjustable hydraulic lifters that are used in many engines including the 4.7L...the only way to fix that tick is new lifters but honestly lifter tick is normal and no big deal.
It usually takes about 1 min to fix lifter tick and I did it probably 50 times.

01 XJ 2wd 4.0
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post #15 of 20 Old 11-24-2013, 10:11 PM Thread Starter
three_jeeps
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Quote:
Originally Posted by doorjamm View Post
Not to steal a thread, but what is the chain tool/ rope used for? I rebuilt my 4.7 from the ground up and didn't use anything like that, so I'm curious
well ya, ya did....thread envy???
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