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More Cam Sprocket Photos

new 10/10/01


001.jpg (188474 bytes) 1) The engine before disassembly
002.jpg (159663 bytes) 2) ID numbers for this engine. Could this be used to help document failed engines? The engine came out of a 1996 SHO with 57,288 miles. Build date was 4-24-96. Warranty start date 4-29-97.
003.jpg (208738 bytes) 3) Left side of engine
004.jpg (180704 bytes) 4) Rear view of engine.
005.jpg (190101 bytes) 5) Front view after partial disassembly.
006.jpg (138673 bytes) 6) This is the oil plug for the rear cylinder head intake cam. Since there is some concern about oiling to the heads you could remove the 4 plugs and install copper tubing and mount 4 small oil pressure gages. Then you could compare oil pressure to all 4 cams. This may sound a little extreme, but might help pinpoint a problem and save an engine.
007.jpg (141660 bytes) 7) This is the oil plug for the rear cylinder head exhaust cam. It is kind of buried in the vehicle. You can measure oil pressure here if you suspect an oiling concern to the camshaft. It is located on the left side of the engine, right above the transmission.
008.jpg (157729 bytes) 8) You canít see it in the picture but this is the location of the oil plug for the front cylinder head exhaust cam. It is behind the water pump pulley
009.jpg (142745 bytes) 9) This is the oil plug for the front cylinder head intake cam. It is located behind the coolant hose, near the temperature sending unit for the PCM.
010.jpg (190840 bytes) 10) This is a picture of the rear cylinder head before removing the camshaft. Notice the bright spot just behind the second gear on the intake camshaft. This is what wears.
011.jpg (167911 bytes) 11) The shiny part next to the inner gear is where the camshaft gear gouged into the camshaft. The gear worked it's way loose and stopped moving, causing the exhaust camshaft to stay put.. The intake camshaft  which is shown, keeps moving, grinding the splines on the gear.
012.jpg (168250 bytes) 12)  See the marks in the circled area. These marks that are left when the gear is pressed on to the cam. There are no splines on the camshaft, only splines on the gears and lobes. This may be OK for the lobes, but it seems like a weak point when it comes to the camshaft gears.
drwg01.gif (32343 bytes) Here is a sketch.
013.jpg (156870 bytes) 13) Check out the valve clearance. At least 1/4". These valves are bent on the exhaust side of the rear cylinder head.
014.jpg (178100 bytes) 14) Here is a picture of the lower camshaft journals for the exhaust cam in the rear head. Notice there is not a whole lot of surface area for the camshaft to ride on. I would think tat this makes it a whole lot harder for the cam to "lock up" due to oiling problems. This shows the journals for cylinders #1 & #2. More accurately, the first 3 journals on the camshaft. It does not look like there was an oiling concern on this engine.
015.jpg (180876 bytes) 15) Camshaft journals for cylinders #3 & #4.
016.jpg (124607 bytes) 16) This is the rear exhaust cam and respective upper journals. There are no bearings in this setup. The camshaft rides right on the aluminum. It does not appear to have any oiling concern. Camshafts and journals look good.
017.jpg (206420 bytes)
17) Here is the the intake cam and journals for comparison to the exhaust cam. Wear looks about the same between both camshafts. I do not believe there was an oiling concern with this engine. it seems like the failure was the inner gear on the intake cam. I feel the cams could be made stronger by having splines both on the camshaft and sprocket. For now, welding the to the cam seems like a good fix.

 


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