SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: evilb on August 21, 2018, 04:24:34 PM
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I recently broke in my rebuilt 455 (due to a flattened cam) and everything went smoothly. Ran it on the hose for the break-in. I was running a bypass thermostat setup with headers and one overboard dump. It stayed locked at 160 degrees. On the first run on the water it over heated. I trouble shot and found my pressure regulator was stuck fully open causing reduced flow through the engine. Took it apart, found nothing wrong, and reassembled. Second outing, over heated. Re-plumbed to remove the regulator. Same result. Next I ran it on the hose with the thermostat and it over heated. I then plumbed it the old school way without the thermostat (just two connections on the housing, overboard and headers). Ran on the hose at idle and couldn't see lower than 150 degrees at full hose pressure. It should be COLD!. BTW, on the hose my water pressure is about 3 psi at max which is more than the pump makes at idle. There is no water in the oil and except for running somewhat rich it runs great. I'm so stumped. Any thoughts?
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I recently broke in my rebuilt 455 (due to a flattened cam) and everything went smoothly. Ran it on the hose for the break-in. I was running a bypass thermostat setup with headers and one overboard dump. It stayed locked at 160 degrees. On the first run on the water it over heated. I trouble shot and found my pressure regulator was stuck fully open causing reduced flow through the engine. Took it apart, found nothing wrong, and reassembled. Second outing, over heated. Re-plumbed to remove the regulator. Same result. Next I ran it on the hose with the thermostat and it over heated. I then plumbed it the old school way without the thermostat (just two connections on the housing, overboard and headers). Ran on the hose at idle and couldn't see lower than 150 degrees at full hose pressure. It should be COLD!. BTW, on the hose my water pressure is about 3 psi at max which is more than the pump makes at idle. There is no water in the oil and except for running somewhat rich it runs great. I'm so stumped. Any thoughts?
Also, outlet water seems to reflect what would be exiting the hose. And it's plenty hot..
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Is this a rebuild? New head gaskets? Might not be the right ones or on wrong?
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Are u running a t
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Is this a rebuild? New head gaskets? Might not be the right ones or on wrong?
Fresh rebuild. Felpro marine gaskets. Didn't over heat during cam break-in.
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Are u running a t
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Yes. T into the water plate.
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T into water plate? I run into the logs first.
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I have headers.
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Is it a basset t by chance
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Could be your problem not opening
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Is it a basset t by chance
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The feed tee is open. The header tee is Bassett.
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