Thread: Oil Pressure loss
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10-31-2015 02:23 PM #1
Oil Pressure loss
I had something go through my BBC oil pump and stick the pressure bypass open. The engine lost oil pressure. I pulled the inserts out of the front rod to inspect for damage. They are very smooth but the lower one was stained. Nothing on crank. I wonder if I should go through the whole engine. Here is a picture.[/URL][/IMG]
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10-31-2015 03:08 PM #2
you probably mean that the TOP half is wiped??????
check them all-rods and mains
496? you probably have a radius throw crank and need bearings narrowed for edge clearance to the radius---might be why those looked like that
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10-31-2015 03:17 PM #3
Bearings are Clevite 77 CB743HN. They are the clearanced narrowed bearings. One of the little bands that holds the valve stem seals is what messed up the pump.
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10-31-2015 03:21 PM #4
Here's another picture. [/URL][/IMG]
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10-31-2015 05:56 PM #5
the pattern on the bearings probably wasn't a result of the oil pump valve--I quite often find on engines during disassembly the upper and lower bearings mixed up---if the bearing is reversed ( upper on the bottom) the edge will/can contact the radius screwing up the side clearance and hamper the flow across the bearing-
can you do a pic of the back sides of bearings??
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10-31-2015 08:54 PM #6
Well I've sure gotten old too so don't worry about it! I've had two bypass surgeries, new knees, fought prostate, cancer and diabetes. I'm half blind, can't hear anything quieter than a jet engine,...
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