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Unread 11-30-2008, 06:35 PM   #1
Leans93
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What is the purpose of this hole above the starter?

So I'm still in the process of my 4.0 swap. It's going along well but I think its going to set a record for the longest swap in history. With work and school I just don't have much time.

Anyways today I'm going to bolt in the starter, when I crawl under there I find this hole above the starter. It is perfectly milled so I know its factory plus there is a picture of it in the FSM. Unfortunately there is nothing to tell me what it is.

So what is this hole for? Should there be anything in it? Is it for a freeze plug that is missing?

I can stick my entire pinky finger in it so I'm sure oil will spill out of it?










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Unread 11-30-2008, 06:49 PM   #2
thetrashman
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It’s for the compact flux compactor that comes stock with the 4.0,
seeing as its the only jeep(engine) that can get to 88mph









srsly i have no idea.
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Unread 11-30-2008, 06:56 PM   #3
ghost183
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dude, i just looked at a motor i have on the floor.. it has a freeze plug there..
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Unread 11-30-2008, 07:03 PM   #4
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Dude--don't panic yet. I just checked mine, there is no freeze plug in mine, just an open gaping hole. I know for certain that I have an original motor, I bought mine in such a state of total neglect that nothing had EVER been done to/for mine and it had to have come this way factory.

Anyone else have any input.
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Unread 11-30-2008, 07:26 PM   #5
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It might be a casting hole so the could put hooks to move the block around. I could picture two chains with hooks holding the engine in a casting plant assy line. That would be the quickest way of moving the block
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Unread 11-30-2008, 08:01 PM   #6
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Thanks for the replies guys!

Quote:
Originally Posted by Opihi59 View Post
Dude--don't panic yet. I just checked mine, there is no freeze plug in mine, just an open gaping hole. I know for certain that I have an original motor, I bought mine in such a state of total neglect that nothing had EVER been done to/for mine and it had to have come this way factory.

Anyone else have any input.
So you're saying you drive your Jeep around daily with this open hole and nothing leaks out of it? The last post said possibly a spot to grip in the factory. If nothing leaks out of it that's good enough for me. If a freeze plug goes there as another post lists then I would assume coolant would leak out?


Quote:
Originally Posted by thetrashman View Post
Itís for the compact flux compactor that comes stock with the 4.0,
seeing as its the only jeep(engine) that can get to 88mph



srsly i have no idea.
Funny you mention that as I started this engine swap on November 5th 1955!



Any other input anyone?
Thanks!!!
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Unread 11-30-2008, 08:13 PM   #7
SonoraDetective
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ha ha ha

It is a milling hole. It is actually one used actually they use four of them to set the engine into the frame during construction.


How's that guess sound...ha ha ha ha ha

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Unread 11-30-2008, 09:10 PM   #8
letitloose06
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If I remember correctly there is a TSB about this hole causing premature rear main seal leaks. Jeep's solution was putting a rubber plug in that hole.
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Unread 11-30-2008, 09:17 PM   #9
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Quote:
Originally Posted by letitloose06 View Post
If I remember correctly there is a TSB about this hole causing premature rear main seal leaks. Jeep's solution was putting a rubber plug in that hole.
its too late for me to go and check, but mine could be a rubber plug, i cant tell just by looking at it due to all the grime thats there, but regardless, rubber or freeze, mine is plugged up
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Unread 12-01-2008, 07:43 AM   #10
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So ghost has a plug in this hole and opihi has a gaping hole, I then assume this is not part of the coolant or oil systems?

I guess then my question is do I need to find something to plug this with? Do I need to worry about this hole at all?

I just don't want to start her up and have something spewing out of it.
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Unread 12-01-2008, 08:06 AM   #11
idaholtby
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"So ghost has a plug in this hole and opihi has a gaping hole"
That just doesn't sound right
My '91 block does not have a plug either. You should be fine. I am curious about the TSB that letitloose mentioned. I don't ever recall reading that one. Can anyone confirm it?
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Unread 12-01-2008, 08:46 AM   #12
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Mine is open and I've always assumed it was a casting hole for lifting purposes at the factory.
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Unread 12-01-2008, 09:17 AM   #13
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Quote:
Originally Posted by Leans93 View Post
So ghost has a plug in this hole and opihi has a gaping hole, I then assume this is not part of the coolant or oil systems?

I guess then my question is do I need to find something to plug this with? Do I need to worry about this hole at all?

I just don't want to start her up and have something spewing out of it.
That hole is nothing. It is simply a way to hold the block. Look further toward the front of the block behind the timing cover and next to the fuel pump boss and there should be another hole of the same size coming out of the side of the block. I used these points to hoist my block. There was never anything in mine.

Good Luck
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Unread 12-01-2008, 09:35 AM   #14
Leans93
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Thanks all!

I'll leave it alone then and continue with the swap!
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Quote:
Originally Posted by Mike Jones
Catch me on the highway or about to tear the mall up.
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Unread 12-01-2008, 10:46 PM   #15
ghost183
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my curiousity got the best of me, and i yanked it.. turns out..

and DONT LAUGH!!!

it was caked in mud, grease, oil, weeds, and whatever that made it into a rock hard plug of sorts when i tapped it yesterday..

SHHHHHHHHHHHHHH!!!!!!!!

i was upside down and hurrying to get back in the house!!
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