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EFV-8 Club Forum / General Ford Discussion / torque required to hand turn a 51 merc. eng.

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Posted By Discussion Topic: torque required to hand turn a 51 merc. eng.     farmer 07-17-2011 @ 1:24 PM reply profile send p.m. Member Posts: 5 Joined: Jul 2011 could some tell me how much torque ittakes to turn over a51 merc. eng. with out the spark plugs in using a torque wrench on crankshaft pulley nut. mine takes 43 ft-lbs. and the starter doesnnt want to turn it over on 6volts? oldford2 07-17-2011 @ 2:00 PM reply profile send p.m. Member Posts: 275 Joined: Oct 2009 We need more info. Is this a fresh rebuild? An old engine? I don't know the torque Lbs but a fresh rebuild is tight. Is the battery good and do you have heavy cables? Jumper cables won't do it. Try 12 volts. John 37RAGTOPMAN 07-17-2011 @ 2:11 PM reply profile send p.m. Senior Posts: 1992 Joined: Oct 2009 Is the starter rebuilt or just a old one with wear.? if you have a tight engine EVERYTHING has to be up to snuff, battery, heavy duty battery cables,grounds, also usually a rebuilt engine started for the FIRST time might have to be pulled with a another car, or tractor, using 2nd gear, but first,just make sure the fuel,water, and oil are full, and once you get it running, monitor to whats going on, placing a fan before the radiator is also a good idea,so it doesn not overheat, once it runs for a hour or so it should start on its own, providing more information , usually helps the person trying to help you, my3 cents 37RAGTOPMAN supereal 07-17-2011 @ 4:19 PM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 If the battery and starter are in good condition, there should be no problem in cranking the engine. Using a known good battery, connect it directly to the engine for a ground, with the other to the starter input terminal directly. If this does not cause the engine to crank briskly, it is likely the engine has been set up too tightly, either pistons and rings, or rod or main bearings. A freshly rebuilt engine will be tight, but not enough to prevent cranking. If you have to pull it to start it, someone scr*w*d it up. TomO 07-18-2011 @ 8:03 AM reply profile send p.m. Senior Posts: 7386 Joined: Oct 2009 Make sure that you have 6 volt cables from the battery to the solenoid and ground, also from the solenoid to the starter. Make sure that your battery voltage does not drop below 5 volts when cranking the engine. Check the connections by connecting a voltmeter between the NEG terminal of the battery and the connection on the starter. It should read no more than 3/10ths of a volt. If you get a higher reading, move the lead back towards the battery to isolate the resistance. If the readings are good, check the starter for conversion to 12 volts. When they are converted the rebuilders usually stamp 12 somewhere on the housing. I never measured the torque required to turn over an engine, but I do not believe that your engine is too tight to be turned over by the starter. Tom farmer 07-18-2011 @ 10:53 AM reply profile send p.m. Member Posts: 5 Joined: Jul 2011 this is a newer eng. and a new battery that sits under the floor on the drivers side. the starter is new. 37RAGTOPMAN 07-18-2011 @ 3:05 PM reply profile send p.m. Senior Posts: 1992 Joined: Oct 2009 farmer I have rebuilt a few engines, and turn them over as I go along in the assembly. so they are not tight but are snugg, also what you have to remember, the rope seal once you install the pan, will add much drag on the turning of the engine, that's why I suggested to pull the car to get started,the engine just need a spin to get it going, if someone installed the parts and it is binding, that is a entirely different story. then you have to see what the problem is before starting the engine, my 3 cents 37RAGTOPMAN TomO 07-19-2011 @ 7:36 AM reply profile send p.m. Senior Posts: 7386 Joined: Oct 2009 Farmer, a "new" starter could very well be a 12 volt starter. If all of your voltage readings are good, remove the starter and take it to a shop that can test it. Have them check the current draw with 6 volt input and check the field coils for 6 volt coils. Tom

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