Out of time ? - JeepForum.com
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post #1 of 28 Old 06-03-2017, 08:20 PM Thread Starter
maggiemay
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Out of time ?

I just purchased a project.
2003 jeep grand cherokee overland.
4.7 high output.
Body is flawless but the engine is not.
The person I bought the jeep from had the engine looked at by a mechanic. The mechanic said the engine jumped time due to being 2 quarts low on oil.
I had to verify his diagnosis.
It's getting fuel. It's not getting spark.
I did a compression test. Cylinders 1,3,5,7 have 0 compression.
2,4,5,8 have 175psi.
So would you say the engine jumped time ?

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post #2 of 28 Old 06-03-2017, 09:01 PM
WJChris
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It seems as if you have a problem with the 1-3-5-7 side head. The cam could have been damaged when a lash adjuster failed... common....

just a wild guess. Pull the valve cover and have a look.
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post #3 of 28 Old 06-03-2017, 09:19 PM Thread Starter
maggiemay
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I pulled the valve cover. The cam and lash adjusters look good.
With the engine at TDC, the v8 mark is slightly NOT at 12 o'clock. Like its a tooth off advanced.
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post #4 of 28 Old 06-03-2017, 09:55 PM
pinky2252s
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Quote:
Originally Posted by maggiemay View Post
I pulled the valve cover. The cam and lash adjusters look good.
With the engine at TDC, the v8 mark is slightly NOT at 12 o'clock. Like its a tooth off advanced.
I would remove the chain and inspect the cam gears and crank gear for any damage. If something is damaged, replace the chain and tensioners and guides. Plus what ever is damaged. Then see if you have correct compression across all cylinders.

Is it broken?

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post #5 of 28 Old 06-03-2017, 10:08 PM
wadewen
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The V8 marks need to be dead center on the top on both sides. I'd say make the adjustment, and try your compression test again.


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post #6 of 28 Old 06-05-2017, 08:18 PM Thread Starter
maggiemay
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I pulled the timing cover to check timing. It was off a tooth . I reset the timing and checked compression again. Still 0 psi. I'll pull the head tomorrow to see if I find anything.
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post #7 of 28 Old 06-05-2017, 09:19 PM
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If you have access to a borescope, you can just pull the plugs and look for damage to the tops of the pistons.

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post #8 of 28 Old 06-06-2017, 02:06 PM
keith20mm
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Did you rotate crankshaft to see that the valves are operating? How can it be 0 compression on entire bank? Can you hear hiss-down when you let off the air?

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post #9 of 28 Old 06-06-2017, 05:15 PM
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Will 1 tooth off have valves hitting Pistons? It's the only one of a very few explanations that all 4 cylinders are dead.

Another is something bad happened and that bank leaned out and melted holes in all 4 Pistons.

Do watch the cam rotate with the crank. I'm thinking it will.
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post #10 of 28 Old 06-06-2017, 06:07 PM Thread Starter
maggiemay
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I pulled the head today and all 4 exhaust valves hit all 4 pistons and bent all 4 exhaust valves. To my surprise it left a very small indent on the piston. Thought for sure I was gonna see a cracked or broken piston.
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post #11 of 28 Old 06-06-2017, 08:04 PM
wadewen
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Nice work. Do you know what your next steps will be?

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post #12 of 28 Old 06-06-2017, 08:57 PM Thread Starter
maggiemay
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I'm gonna take the head apart and send it to the machine shop to have them check for cracks and have them check the camshaft Then I'm gonna replace all the valves If no cracks in head. Damn shame this hsppened, the previous owner had the whole engine overhauled less than a year ago.
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post #13 of 28 Old 06-07-2017, 01:44 AM
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Any idea how the timing jumped? Are the chains and tensioners FUBAR?
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post #14 of 28 Old 06-07-2017, 05:16 AM Thread Starter
maggiemay
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I'm assuming since the previous owner was a few quarts low on oil, the timing tensioners had no oil pressures to pump them up, which made the chains have extra slack which made the chains able to jump a tooth or 2
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post #15 of 28 Old 06-07-2017, 05:47 AM
HarryH3
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Quote:
Originally Posted by maggiemay View Post
I'm assuming since the previous owner was a few quarts low on oil, the timing tensioners had no oil pressures to pump them up, which made the chains have extra slack which made the chains able to jump a tooth or 2
If it was run THAT low on oil, you should consider dropping the oil pan and pulling a few main and rod caps so you can have a look at the bearings. It would totally suck to spend a bunch of money on the top end and then find out that the bottom end is garbage.
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