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| Mystery Hole http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=86973 |
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| Author: | sbarne3 [ Wed Aug 02, 2017 9:35 am ] |
| Post subject: | Mystery Hole |
Hi all... I'm still trying to put my project crd back together and I found a hole on the side of the block and I can't seem to figure out what it is for or what is supposed to be there. I have looked through the diagrams on the mopar parts sites and can't see any reference to it. Can someone tell me what this is? It is on the driver's side of the engine block just in front of the egr cooler.  
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| Author: | WWDiesel [ Wed Aug 02, 2017 9:57 am ] |
| Post subject: | Re: Mystery Hole |
sbarne3 wrote: Hi all... I'm still trying to put my project crd back together and I found a hole on the side of the block and I can't seem to figure out what it is for or what is supposed to be there. I have looked through the diagrams on the mopar parts sites and can't see any reference to it. Can someone tell me what this is? It is on the driver's side of the engine block just in front of the egr cooler. Block Heater |
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| Author: | papaindigo [ Wed Aug 02, 2017 10:09 am ] |
| Post subject: | Re: Mystery Hole |
If you mean the "orange" looking thing in the middle of the image it's a "freeze" plug and nothing but the plug is supposed to be there. If not try posting a couple of other pictures 1) a bit further back see we can better see where you are on the engine (looks like head with cam/rocker cover off) and 2) with something pointing to or touching the hole in question. |
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| Author: | sbarne3 [ Wed Aug 02, 2017 10:13 am ] |
| Post subject: | Re: Mystery Hole |
Thanks guys I'm at work now, but will try to get some better pictures this evening Sent from my Pixel using Tapatalk |
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| Author: | sbarne3 [ Wed Aug 02, 2017 7:04 pm ] |
| Post subject: | Re: Mystery Hole |
Ok... here are a couple more pictures. One is a close-up (the best I could do because it is difficult to reach) The other is further back than the others to give context (I have circled the hole in red for clarity)  
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| Author: | flash7210 [ Wed Aug 02, 2017 7:29 pm ] |
| Post subject: | Re: Mystery Hole |
I'm going with block heater. I can see some threads in there but it looks rough. |
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| Author: | GordnadoCRD [ Wed Aug 02, 2017 10:29 pm ] |
| Post subject: | Re: Mystery Hole |
WWDiesel wrote: sbarne3 wrote: Hi all... I'm still trying to put my project crd back together and I found a hole on the side of the block and I can't seem to figure out what it is for or what is supposed to be there. I have looked through the diagrams on the mopar parts sites and can't see any reference to it. Can someone tell me what this is? It is on the driver's side of the engine block just in front of the egr cooler. Block Heater I agree. It looks as though it has spent a great deal of time with just plain water, or insufficient antifreeze, to generate corrosion like that. |
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| Author: | sbarne3 [ Thu Aug 03, 2017 9:40 am ] |
| Post subject: | Re: Mystery Hole |
So can I just put some kind of plug there instead? I don't really need a block heater here in Texas, right? Sent from my Pixel using Tapatalk |
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| Author: | papaindigo [ Thu Aug 03, 2017 9:54 am ] |
| Post subject: | Re: Mystery Hole |
Yep. Block heater hole which per engine pics at http://colorado4wheel.com/manuals/Jeep/ ... 0posts.pdf is just in front of the EGR cooler. You definitely need to cleanup the threads and install it (best price for heater with cord is http://www.idparts.com/engine-block-hea ... -4100.html) or you will have a massive coolant leak. Judging by the rusty crud in there I gather the block has been open to the air for a while in which case once you get it buttoned back up I suggest running with a quality coolant system flush or two before filling with the proper HOAT antifreeze. |
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| Author: | WWDiesel [ Thu Aug 03, 2017 12:16 pm ] |
| Post subject: | Re: Mystery Hole |
Pap's good picture of block heater with enhancements! 
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| Author: | sbarne3 [ Thu Aug 03, 2017 1:52 pm ] |
| Post subject: | Re: Mystery Hole |
Thanks... Any suggestions for cleaning up the threads? Sent from my Pixel using Tapatalk |
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| Author: | WWDiesel [ Thu Aug 03, 2017 2:09 pm ] |
| Post subject: | Re: Mystery Hole |
sbarne3 wrote: Thanks... Any suggestions for cleaning up the threads?Sent from my Pixel using Tapatalk A bottoming tap would be nice if you know the thread size and pitch. Otherwise, a small wire brush and some penetrating oil... You may even find a round wire brush that goes on a drill? |
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| Author: | papaindigo [ Thu Aug 03, 2017 3:10 pm ] |
| Post subject: | Re: Mystery Hole |
If you are a hunter/shooter or know someone who is I'd suggest about a 12 or maybe 20 gauge brass bore brush and Hoppe's #9 should do the trick without any chance of damaging the threads. Also if you have access to a bit of phosphoric acid some of that applied via a "Q" tip will help kill any remaining rust (apply liberally; let sit say 15 minutes; rinse with tap water) |
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| Author: | WWDiesel [ Thu Aug 03, 2017 10:18 pm ] |
| Post subject: | Re: Mystery Hole |
Good advice by Pap,  Phosphoric acid is a rust converter, not a remover. It turns iron oxide into iron phosphate, which is very stable. The phosphoric acid changes the reddish-brown iron(III) oxide, Fe 2 O 3 (rust) to ferric phosphate, FePO 4. |
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| Author: | sbarne3 [ Fri Aug 04, 2017 8:34 am ] |
| Post subject: | Re: Mystery Hole |
Thanks guys I'll give it a try. I also ordered the block heater from idparts Sent from my Pixel using Tapatalk |
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