RenoF250 wrote:
That seemed like the direction it should go but did not seem right for the pump.
That is the only way it can flow.
What happened with the cam bearings? How can those go bad? They have the easiest job in the engine. What do I need to watch for there?
Using the stock pin and spring cam retention the cam was moving in and out of the block, causing the oil film to break down which caused the the bearings to fail. They failed several times in under 200 miles. First I replaced the spring with a solid pin and set end play normally. That solved the bearing failures. Then I went with a custom cam and used the later style cam retention plate. No problems since.
RenoF250 wrote:
That seemed like the direction it should go but did not seem right for the pump.
That is the only way it can flow.
What happened with the cam bearings? How can those go bad? They have the easiest job in the engine. What do I need to watch for there?
Using the stock pin and spring cam retention the cam was moving in and out of the block, causing the oil film to break down which caused the the bearings to fail. They failed several times in under 200 miles. First I replaced the spring with a solid pin and set end play normally. That solved the bearing failures. Then I went with a custom cam and used the later style cam retention plate. No problems since.
Wow, 200 miles, now I see why it is recommended to get rid of the spring and go with a solid pin. What timing set where you using? How hard it is to go to the retention plate? Doesn't the block need some machining?
RenoF250 wrote:Wow, 200 miles, now I see why it is recommended to get rid of the spring and go with a solid pin. What timing set where you using? How hard it is to go to the retention plate? Doesn't the block need some machining?
I was using the JP Performance timing set on the earlier cam and now I am using a stock style for the plate. My block already had the provisions for the plate so no machining was needed. If your block doesn't have the flat surface and bolt holes I would just use the pin.
Lets talk about this spring pin retention plate business. I am trying to think of where/what this was in the engine. I just put the cam/timing gear back in the way it came out, and I don't remember any pin except the guide pin for the timing gear. Can I get an in depth description of these parts, maybe a picture? Thanks.
jeepxj3 wrote:I thought it flows out the thermostat housing?
That is correct
WP--to block--out the back of the block to back of head--across the head to the front--out the thermostat--to the top or the radiator--out the bottom to WP...
Sort of correct. There are cooling passages all through the head gasket, so it isn't 100% pushed to the rear and the rear will see decreased flow.
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Water circulation in the block/head assembly is supposed to be natural, coolest water (heavy) is at lowest point and the warmest at highest point at any given time. Water pumps only function is to circulate coolant from the radiator to the block/head assembly.
Debris and excessive corrosion in the cooling passage can influence the natural water circulation in the block /head assembly but it needs to be alot of it.
The spring and then the pin are inserted into a hole which is in the head of the cam retaining bolt, they line up with the nipple on the inside of the timing cover
