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  #16  
Old January 17th, 2018, 07:46
burntkat burntkat is offline
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Re: Documenting My Crank Walk - Jeep 4.0

Quote:
Originally Posted by BALTANAKT View Post
Does 2-97 = month-year? Trying to understand how we know for certain this was rebuilt.

I'm currently swapping in another motor in.
Yes, I'm nearly certain it does.

See pic and article at: https://www.google.com/search?q=date...tgO7EIru8V02M:
(sorry, can't get to the tinyurl service from work)
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-89 S-10: SAS, D44s front/rear. 5.7L V8. 700R4 with 4L60E upgrades. Built in my driveway.
-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Rehabbing with D44s, RE spring packs, RE 4.5" coils, and ACOS.
-94 ZJ: Budget boost, 31s. The wife's DD.
-97 XJ: Son's DD. 4" lift, ACOS, 4" spring pack, Upcountry coils, 31s
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  #17  
Old January 17th, 2018, 08:28
trippled trippled is offline
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Re: Documenting My Crank Walk - Jeep 4.0

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Originally Posted by burntkat View Post
Yes, I'm nearly certain it does.

See pic and article at: https://www.google.com/search?q=date...tgO7EIru8V02M:
(sorry, can't get to the tinyurl service from work)
Yea I kinda thought the same.plus the .010 undersize marking pretty much makes it definitive it's at least had the crank out.
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  #18  
Old January 17th, 2018, 08:36
burntkat burntkat is offline
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Re: Documenting My Crank Walk - Jeep 4.0

Concur.
Since the bearings are marked Clevite, and their Tech guru just told us in that video how to read them, it has most definitely had the crank out.

While the rest of it has possibly not even been touched, pulling a crank and putting undersize bearings in tells us there has been very significant work done- the bearings are crucial to the oiling system, which is itself cruical to the entire engine, after all. I would go so far as to say if anyone yanked the crank and didn't do anything to the rest of the motor, they're idiots.

The very fact we know the crank has come out, and there is now an endplay issue owing to bearing "Failure" of a Clevite bearing, makes the quality of the work highly suspect. Clevite is a highly respected bearing manufacturer, and their quality control, while not infallible, is a known quantity.

IIWM, I would send these pics into their tech guys and ask them what they thought. I bet they can tell us more than we'd ever imagine, just from a few pics.
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-89 S-10: SAS, D44s front/rear. 5.7L V8. 700R4 with 4L60E upgrades. Built in my driveway.
-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Rehabbing with D44s, RE spring packs, RE 4.5" coils, and ACOS.
-94 ZJ: Budget boost, 31s. The wife's DD.
-97 XJ: Son's DD. 4" lift, ACOS, 4" spring pack, Upcountry coils, 31s
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  #19  
Old January 17th, 2018, 11:16
BALTANAKT BALTANAKT is offline
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Re: Documenting My Crank Walk - Jeep 4.0

So they have been replaced. Interesting.

Still unsure how the shoulders of the thrust bearing self destructed.

But it makes sense that there was work done - Never have known factory 4.0's to have issues like this.
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  #20  
Old January 17th, 2018, 22:10
blu3fan's Avatar
blu3fan blu3fan is offline
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Re: Documenting My Crank Walk - Jeep 4.0

245k on my motor.
2 rebuilds. new crank. new cam. on first.

4.0's do not have factory issues like this.
the head gaskets blow if you have any cooling issues.
and sometimes the heads crank if you have a specific casting.
but they are pretty bulletproof.

cant beat cast iron man.
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  #21  
Old January 18th, 2018, 09:49
burntkat burntkat is offline
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Re: Documenting My Crank Walk - Jeep 4.0

Quote:
Originally Posted by blu3fan View Post
...
4.0's do not have factory issues like this.
the head gaskets blow if you have any cooling issues.
and sometimes the heads crank if you have a specific casting.
but they are pretty bulletproof.

cant beat cast iron man.
Concur.

I have a junkyard pull in my 90, replacing the stock motor that the DSPO hydrolocked and installed a window in.
I had a fuel wash issue (my fault, didn't know enough about EFI at the time and put overly large injectors out of a 5.0 Mustang in, thinning the oil), which resulted in a hot/high-RPM knock in the mains.

Dropped the pan, washed out the mess, reassembled with new cheap oil. Kept driving it.

I did park it 8 years ago. I'm presently resurrecting it and going to try to limp this same motor along a bit longer. I haven't inspected the journals, and am in fact looking to beat on it a bit to see how much abuse it will take before it is dead. It's been overheated pretty hard a couple times asa well.

Had a similar issue in my 4.3 in the S10, due to the "professional mechanic" that helped me change the motor in '02. He didn't secure the oil pump pickup and it fell off. I drove it for years unaware of this issue till the front seal failed. Reinstalled a new OP and timing set and continued to drive it for a year till I got the bits together for a 5.7 transplant.

Cast iron takes a beating... in my trucks, hibachi, smoker, and on my kitchen stove.
__________________
-89 S-10: SAS, D44s front/rear. 5.7L V8. 700R4 with 4L60E upgrades. Built in my driveway.
-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Rehabbing with D44s, RE spring packs, RE 4.5" coils, and ACOS.
-94 ZJ: Budget boost, 31s. The wife's DD.
-97 XJ: Son's DD. 4" lift, ACOS, 4" spring pack, Upcountry coils, 31s
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  #22  
Old January 19th, 2018, 05:22
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Hypoid Hypoid is offline
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Re: Documenting My Crank Walk - Jeep 4.0

What markings are on the upper half? Have all the mains been replaced?
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