fresh7.4 locked up first time out
05-03-2003, 10:34 PM
#1
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fresh7.4 locked up first time out
Two weeks ago my fresh 454 built by myself locked up on the first run after 45 min. of running time. I restarted it the next day and it seemed to run fine. I pulled it anyaways and found no problems except for the thrust area of the rear main. I brough it to the machine shop for a thourough tear down and they found nothing wrong. Polished the crank and put new bearings back in. (let them assemble this time) I never checked drive alignment when i put it back in but it slid right in place. What cou7ld have caused this? Note: the oil pressure never exceeded 40psi and i was leary about it from the start. The machine shop said everything was ok.
05-04-2003, 10:07 AM
#3
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As I was cruising at 3200rpm it started to loose power and i tried to give it more. Motor died and would not turn over to restart. Pulled all plugs and there was no sigh of any water. Let it cool down and it fired right up the next day. Ran smooth but had a squeal noise like the impellor was getting dry and ready to go bad. The noise was not the impellor. I pick it up from the machine shop today. The machine shop said I did nothing wrong with assembly and they could find nothing wrong except for the rear thrust side of the bearing. clearaces perfect, oil pump fine, no blocked passages. He put new bearings in and replaced the oil pump anyway. I will put the long block together myself.
05-04-2003, 01:21 PM
#6
MarineKinetics
Platinum Member
Cheitman,
Did you check crankshaft endplay? Should be between .005-.007. If there isnt enough endplay I have seen them ruin the rear main and the thrust surface of the crankshaft. It probably restarted after the cool down process due to component contraction. Be sure to check the thrust surface of the crank before you reassemble to be sure it isnt blued or scored.
Bob
Did you check crankshaft endplay? Should be between .005-.007. If there isnt enough endplay I have seen them ruin the rear main and the thrust surface of the crankshaft. It probably restarted after the cool down process due to component contraction. Be sure to check the thrust surface of the crank before you reassemble to be sure it isnt blued or scored.
Bob
Gold Member
05-04-2003, 02:21 PM
#8
Official OSO boat whore
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What were your engine temps? I'm wondering if you over heated it. I had a engine once that overheated because the thermostat stuck closed. It was running fine until it came to an idle where as it promptly stopped. The engine wouldn't turn over, the starter only clicked. About 20 minutes later the engine started and ran just fine. Also, if the engine is without water, the gauge will not show a high temp. It can't read air temperature, only water.
