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Mystery vent hole?

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Bufordjeep View Drop Down
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    Posted: Dec/02/2019 at 10:16pm
Hello AMC forum, new member here...
I'm replacing the clutch on a 1975 CJ5 with a 304.  There's a hole in the block on the same surface as the oil pan & behind it & appears to go directly into the crankcase. Is that a vent & should it have a connection or tube or something?  Perhaps a plug?  Round milled hole on the underside of the block??  
Any insights would be most appreciated.  
Thank you
Bob
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mixed up View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mixed up Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 12:03am
pic of location might help
69 amx 290 auto
65 220 290 4spd
80 ford fairmont
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Bufordjeep View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bufordjeep Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 3:44am
Good point, will figure out how to post one.
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bwamx View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bwamx Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 11:27am
Passenger side ? If so it's a register hole, used to locate the block during machining at the factory.
There is one also at the front of the block on the same side.  No need to plug it.
Welcome to the forum.

Bob 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMXFSTBK390 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 11:42am
Threaded Hole for the oil pick up tube?
The most powerful tool is the question.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMXFSTBK390 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 11:48am
Photo of oil pic up tube
The most powerful tool is the question.
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tufcj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 12:00pm
I think the hole he's talking about is in the upper left of your pic.  It's just a register hole that was used during the machining process.  It's a blind hole, no plug required.

Bob
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Bufordjeep View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bufordjeep Quote  Post ReplyReply Direct Link To This Post Posted: Dec/03/2019 at 6:24pm
That's exactly the hole!  Should have figured it out with a simple, stick a screwdriver in there - I'm a dope...
Thank you gentlemen.  Really appreciate you guys helping an old Jeep guy out.
Thanks!
Bob
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