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desertjoe 
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Joined: 23 Sep 2013
Location: New mexico
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 Topic: bet none of ya'll seen this,,,,,,,
Posted: 01 Mar 2020 at 3:59pm |
In all my years of rebuildin engines of all makes and models,,I came up on something that must be rare as I've never heard of it. I finally got my cam bearing remover/installer tool machined out of the snout off a 4.0 (gasp) Ford 4.0 cranksshaft. I cut the crankshaft snout plus part of the first bearing journal, then machined down to fit the BBC cam journals. The sob works like a chaRM and I knocked the old cambearings out pretty as you please.  THEN,,,I was dropping a long allen wrench into the oil holes on the block so I could mark the exact center of the entry hole of the cam bearings on the block and when I get to #1 cam journal,,,,the friggin allen wrench would not go all the way down into the bearing area,,,,WTF,,,?? Finally got a HF light to see thru the oli hole in the block and the sob is not drilled all the way thru,,,!!!! WTH,,?? How did that engine last all them years in that farmer's trk without spinning a bearing almost after the very first time the engine was started up at the factory???? I looked at the original cam bearing that was in #1 journal and believe it or not,,,it was just as good as the rest of the bearings, This engine had never been apart as it still had the GM cam, rod and crank bearings. Plus the PO told me he bought the trk new and engine never been opened up,,,,,? Well,,after breaking 4 drill bits, I finally got the hole opened up,,,,, Thas just weird,,,,,
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im4racin
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Joined: 12 Jun 2017
Location: Garrison ND
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Posted: 01 Mar 2020 at 5:13pm |
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Is the cam drilled for oil to come from another journal?
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desertjoe
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Posted: 01 Mar 2020 at 6:57pm |
Thats the first thing I looked at,,but all the other supply holes are at the 6 O'clock position except #5 which is at the 5 O'clock position,. While I was trying to see the oil hole at #5,,I noticed SHP cast into the block between the crank journal and the cam journal,,,?
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im4racin
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Location: Garrison ND
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Posted: 01 Mar 2020 at 7:00pm |
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Look at the cam...do those bearing journals have holes in them? Is it taking oil from another bearing and routing through cam to get to the one not drilled?
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Thad in AR.
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Joined: 12 Sep 2009
Location: Arkansas
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Posted: 01 Mar 2020 at 7:21pm |
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Can you get an air chuck up to that hole? Bend a wire in an L and poke around some. What year is that motor? 65 and 66 bearings were different. You got me digging. I think you’ll find everything is as it should be.
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desertjoe
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Joined: 23 Sep 2013
Location: New mexico
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Posted: 01 Mar 2020 at 9:59pm |
From what I've read,,the early 396's had a different thrust bearing oil hole location than the later 427's and the 454's.
I had the crankshaft removed getting ready to install the new cam bearings, and block was upside down on the stand. I was dropping a long thin allen wrench in each oil hole from the crankshaft side of the block down into the camshaft area in order to mark a "sharpie" mark on the block so I could see where the oil hole was on the block as it is NOT visible from either end. That's when I discovered that the #1 cam journal had not been drilled all the way thru because the small allen wrench would not go thru into the cam area like all the others. AND,,I could NOT see the camshaft area even with a light shining into cam journal,In thinkin this out some more,,,,I'm wonderin if those oil holes are sand casted in the blocks and then machine drilled out during the final machining process?? THAT maybe explains why I broke like 4 drill bits while trying to drill the oil hole out to same size as the other 5,,,,???? Same goes for the GM machinist NOT finishing drilling it all the way thru and just let this block go on down the assembly line,,,,,Good quality control, huh,,,??
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HD6GTOM
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Joined: 30 Nov 2009
Location: MADISON CO IA
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Posted: 02 Mar 2020 at 1:05am |
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Them Chevy engines is the toughest ones made. Just ask ol Shamless! I don't know why it wasn't right. It had to be getting some lube from somewhere. Are you sure there wasn't an oriface in the hole to prevent over lubing that part of the engine? Some AC tractors have 1 in a oil line to prevent it.
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desertjoe
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Posted: 02 Mar 2020 at 2:19am |
I don't know,,Tom,,,I could not poke the allen wrench all the way thru to to camshaft area. The allen I was using was bout an 1/8" size,,and I could not see past the drilled part of the hole. When I first tried to drill the rest out,,the drill bit hung on something and snapped the bit like right now. Tried three more times and broke them too,,,!! Then,,I tried a hardened punch ground on an angle and I could slowly chip away little bitty pieces of what looked like cast iron. I really think there must of been some oil passing thru that hole even tho it was not "drilled" all the way thru. I was finally able to drill thru using a cobalt bit but goin very slowly so not to hang it up and break it too,,,
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shameless dude
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Joined: 10 Apr 2017
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Posted: 02 Mar 2020 at 10:21pm |
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if it ain't broke...DON'T FIX IT! it musta been working before this
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desertjoe
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Posted: 03 Mar 2020 at 1:33am |
 shameless dude wrote:
if it ain't broke...DON'T FIX IT! it musta been working before this |
Well,,Shameless,,I usually follow that advise but I also like to thinkl if I touch it ,,,,,it gonna be at least better than how I fount it,,,,,,
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tadams(OH)
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Joined: 17 Sep 2009
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Posted: 03 Mar 2020 at 1:30pm |
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If that bearing wasn't wore out then it was getting all the oil it required, now will it get that oil since you changed things? You're the one that's got to live with that
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desertjoe
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Posted: 03 Mar 2020 at 3:26pm |
tadams(OH) wrote:
If that bearing wasn't wore out then it was getting all the oil it required, now will it get that oil since you changed things? You're the one that's got to live with that |
Why would you think that I "changed" anything and that this block is gonna go to chit simply because I finished drilling the oil hole out,,?? I'll wager that there have not been any more than a single handful of blocks that have ever left the factory with this screwup. I cannot count how many engines I have tore down in my life that have EVER had one of the oil holes like this one,,,and I seriously don't think anybody else has either. At least none of the people commenting here have said so. Well,,,MY glass has ALWAYS been half full,,,altho,,,there are those that their glass always seems to be half empty,,,,, 
Edited by desertjoe - 03 Mar 2020 at 3:34pm
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steve(ill)
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Posted: 03 Mar 2020 at 4:48pm |
Joe, i am wondering if they drilled the hole and the drill bit BROKE and a piece stuck in the hole... Maybe you were getting a few drops now and then to the bearing.. You tried to DRILL and you were hitting the broken bit... Cast iron aint that hard... When you hit it with the pointed chisel, you busted up the broken bit into little pieces..
NICE FIND !!
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Like them all, but love the "B"s.
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desertjoe
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Posted: 03 Mar 2020 at 9:44pm |
You might be right,, Steve,, cause when I first noticed it,,I could NOT see thru the hole into the cam journal area, I first thought that the hole just had some trash build up, so I chucked up a drill bit just a tad smaller than the drilled hole and ,,,,,,promptly broke the bit,,!! I had a small pair of needle nose that were bent and I was able to turn the broken bit back out without any trouble at all. I chucked up two more bits and broke them off just as quick. I shined a light into the hole and could not see thru it at all. I got a small drift pin and ground the tip at an angle and slowly chipped away little bitty pieces of metal. After several hours of thet chit,,I borrowed a cobalt drill bit with lots of cutting fluid and VERY slowly managed to drill a hole all the way thru. The machinist I borrowed the cobalt bit from told me he had never seen a block like this,,,and I hope this is the last one i do too,,,
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shameless dude
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Posted: 03 Mar 2020 at 9:51pm |
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and I have a perfectly good 454 just sitting here! could have picked it up when/if you ever come for that tractor!
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desertjoe
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Posted: 04 Mar 2020 at 3:10am |
shameless dude wrote:
and I have a perfectly good 454 just sitting here! could have picked it up when/if you ever come for that tractor! |
Well,,Shameless,,,it would sure help matters a whole bunch if ,,,,if,,,you would just load up all your "treasures" and move on down here,,,that way I could "help" you with your culinary chores and even volunteer to be "Chief Tester",,,,,yeah,,,I could do that pretty easy,,,,what'cha think,,,???
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