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Old 06-27-2008, 11:06 AM
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Clevite 77 question?

I'm buildng an engine with Clevite 77 bearings. In the past these bearings had upper and lower stamped on them(rod and main). These don't, so does it matter?

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Old 06-27-2008, 12:43 PM
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Yes it does matter is you are using after market crankshaft because of extra fillet in the corner and you need more clearance in the corner.
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Old 06-27-2008, 12:51 PM
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On the rod bearings it should not matter. If all of the main bearings have a center oil hole and groove it won't matter either.
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Old 06-27-2008, 01:18 PM
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Quote:
Originally Posted by carsavvycook
On the rod bearings it should not matter. If all of the main bearings have a center oil hole and groove it won't matter either.

the main bearings only have a hole on one side, so i just matched the holes. the rod bearings say nothing, so it doesn't matter?
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Old 06-27-2008, 01:27 PM
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Quote:
Originally Posted by savman1
the main bearings only have a hole on one side, so i just matched the holes. the rod bearings say nothing, so it doesn't matter?
No it will not matter. I have never seen a set of rod bearings marked with upper and lower.
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Old 06-27-2008, 02:06 PM
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Quote:
Originally Posted by carsavvycook
No it will not matter. I have never seen a set of rod bearings marked with upper and lower.

I could be just thinking of the mains.
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Old 06-27-2008, 04:00 PM
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Quote:
Originally Posted by carsavvycook
No it will not matter. I have never seen a set of rod bearings marked with upper and lower.
They do have rod bearing that is marked upper and lower. Because my dad sells them every day and I assemble engine about four a month.
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Old 06-27-2008, 10:24 PM
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A P (for passenger) bearing upper and lower do not have the chamfer on them so they are all the same upper and lower. An H bearing has the chamfer so it does matter on where they go. All of the H bearings I have used in the past 15 years are the ones with the dark streaks on them and they are marked upper and lower. I use them one seasion and send them to Poly Dyn to get them coated and reuse them. Never had any issues but after the second seasion (about 600 runs total in 2 years) I throw them on the shelf for spares. I figure they deserve a break.
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Old 06-28-2008, 08:14 AM
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Most of the Clevite H and V-series bearings are a narrow bearing and are no longer chamfered and are narrowed on one side so they are marked upper and lower. The part number for an H bearing would be CB663HN and the V-series would be CB663VN
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