Whats up with this main bearing? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 5 Old 02-24-2008, 10:46 PM Thread Starter
 
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Whats up with this main bearing?

I'm in the middle of putting a 3.8L together and am right in the middle of plastigauging the mains. The first one went in great and mesured a bit loose, but still in spec.

Onto the second main. The upper (block side) snapped into place and centered just fine. When I looked at the lower (cap side) it doesn't look like the notch is centered like the other 19 bearings (used and new). For the sake of a better visual I loaded the cap onto the crank and took a picture. You can see the bearing sticking out. I don't think I have feelers thick enough to read the distance between the bearing and the counter weight, but I'd say it sticks out roughly 1/32 of an inch from the cap.



The crank was polished and the bearings are new. Cutting the bearing isn't an option, I might as well buy a new bearing kit if thats your answer. I just don't see this being right.

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post #2 of 5 Old 02-25-2008, 12:03 AM
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can't tell much from the pic, but are you sure the cap and the bearing are oriented correctly? did you disassemble the engine to begin with? possibly the wrong cap?

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post #3 of 5 Old 02-25-2008, 12:43 AM Thread Starter
 
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in the picture the big white line you see is the bearing sticking out from the cap.

The bearing is properly installed in the cap, with the correct cap in the correct orentation and sequence. I uninstalled everything myself, keeping everything labled and laid in the proper directions. Ford even helped out by putting two nice little aarows to indicate which cap and what direction it is to go in.
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post #4 of 5 Old 02-25-2008, 09:16 PM Thread Starter
 
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The cap shouldn't need to be re-notched. The notch is dead center. If I were to put any other bearing in it, the bearing would sit centered in the sadel. The notch in the bearing is not centered in this particular case causing it to stick out from beyond the main.

The lower (oil feeding) bearing is sitting in the block dead center, but this one however is not, which has me worried about proper oiling and possible scaring of the crank.

For a better idea of what I'm dealing with look at the following picture. This is not my bearing, but I used the pic in order to illustrate my problem. All of my bearings have the notch where the green line is. This causes them to sit centered in the sadal. The bearing in question however is notched where the red line is, thus causing it to stick out further.



Not to distrust any one persons wisdom, but I'd really like to have a "no contest" agreement on if this bearing is still good or was bad from the clevite factory.
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post #5 of 5 Old 05-02-2008, 12:04 PM
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Scott, are you using the SC block and SC Crank?

Or did you get another 3.8 block and put the SC crank in it?

No.. I'm not "Fast."
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Simply awesome! Its like you came down from forum mountain with two stone tablets...
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