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Author Topic: 572  (Read 367114 times)

mr.mindless

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Re: 572
« Reply #1410 on: September 21, 2015, 04:56:03 PM »
My motor went electrically open. still spins free.
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M4wdFab

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Re: 572
« Reply #1411 on: September 25, 2015, 08:14:58 AM »
Moved last night out of the trailer.  Cylinder #2 def a COLD HOLE.   

Boooo.   

Probably do compression check after confirming no electrical issues, then pull that head, its the easy access side. it will be less than an hour of work on that side, and either a new head would fix (if combustion chamber isnt box of rocks) or with the top end removed, maybe the motor would lift out without chassis cutting.  meh. 
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M4wdFab

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Re: 572
« Reply #1412 on: October 03, 2015, 04:43:44 PM »
#2 has compression (same finger check pass as cylindar next to it) and spark. 

plug is black and wet.  still a cold hole with plug swapped. 

not sure what that means?   going to pull exhaust manifold and watch valves  on cranking. 

addition 5.3 doner or heads for 6.0 build acquired.  4l60e 4x4 core also came with it.  350$ complete
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mr.mindless

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Re: 572
« Reply #1413 on: October 03, 2015, 07:26:04 PM »
Swap wire and coil... Seems weird.

Score on truck.


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M4wdFab

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Re: 572
« Reply #1414 on: October 04, 2015, 09:36:10 PM »
power washed and hot lapped back to the shop.  starting to think this thing was on 7 cylindars for a while.  it feels the same fine.  #2 is dead. 


still need to do compression but everything else is ok.  no fire. 
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M4wdFab

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Re: 572
« Reply #1415 on: October 04, 2015, 10:53:19 PM »
seems like there are alot of junkyard LM7 with Ebay turbo builds that are pushing 600hp



sounds like something worth investigation. 
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M4wdFab

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Re: 572
« Reply #1416 on: October 05, 2015, 06:53:03 PM »
WTF


125psi compression in the #2 cold hole

running down the head back to front, 120,120,118
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M4wdFab

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Re: 572
« Reply #1417 on: October 05, 2015, 06:56:11 PM »
Quote
What is common, if you have a very high mileage engine... is low compression across the board. Low usually means anything under 120 PSI (although the service manual says 100 PSI is the minimum). If your engine has reached this point... it's also smoking from the quart of oil it's burning every few days. The other symptoms you'll see is that the idle will be very rough.
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M4wdFab

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Re: 572
« Reply #1418 on: October 05, 2015, 06:59:02 PM »
i guess next is swap an injector.  maybe the wetness observed on the plug is oil and not fuel? 


coil pack, wire, plug swapped to another cylinder, work fine after some at work suggest spark loss under compression.

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gif

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Re: 572
« Reply #1419 on: October 05, 2015, 07:58:03 PM »
must be fuel based on the above findings
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M4wdFab

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Re: 572
« Reply #1420 on: October 05, 2015, 11:57:44 PM »
injector resistance good.  pulled injector.  minimal debris in 30um inlet filter.  flushed and verified function.  cranked and fired motor with bank of injectors out of the intake.  no fuel spray from the cold hole.

ground good to injector.  pulled ECM pinouts... no dice for continuity to the pin it is supose too be! 


wire harness failure. 


bingo, jumped in a new wire for testing, V8 status returned. 

now to assemble, and fill with water / fix radiator / remove trail fix hacks and see if head gaskets blown at temp. 
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Re: 572
« Reply #1421 on: October 06, 2015, 08:29:24 AM »
Nice work!
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JEEPWERX

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Re: 572
« Reply #1422 on: October 06, 2015, 08:37:47 AM »
Let's hope that was it!

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M4wdFab

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Re: 572
« Reply #1423 on: October 07, 2015, 12:20:14 AM »
reassembled and filled rad with water.  heat cycled to 240 and runs like rapped ape.  i think she is ready for KOH round 2...... 



yessssss.
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mr.mindless

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Re: 572
« Reply #1424 on: October 07, 2015, 08:41:13 AM »
I hope so! Damn thats weird. You find the actual short/ wire damage? Look fresh?

The change in exhaust note is whats staying with me here, would love to explain that.


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