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Turning engine over during rebuild

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Alex Dula

12-18-2000 05:45:28




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I am rebuilding the 8N and have the crank (new) and cam shaft in and pistons (new). When I tightened the rod nuts on the engine it is very hard to turn over. I have lubricated all the bearings. When I put the main bearings (new) in and the tighten the main bearing bolts I can not turn over the engine. What do I need to put on next to turn over the engine? I have a hand crank if I put the pulley on the front will that let me turn it over? Also I have heard to pack the oil pump with grease to aid in getting the oil flowing in the engine, if so what kind of grease and do I put any in the pickup tube? Thanks for any suggestions.
Alex Dula

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JimNC

12-18-2000 16:38:42




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
I rebuild diesel engines for a living, I can turn them over by hand on the crankshaft pulley. It gets progressivly harder after each piston is put in but can still turn by hand.



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Frog Level

12-18-2000 10:35:23




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
After rebuild, my engine would not turn. One of the rods was out of round with the journal and seized up. Had all of them rebored and that solved the problem. I would try to turn the crank after loosening each rod cap...might save some retightening later.



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Hilltopper

12-18-2000 07:31:12




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
I had the occasion to overhaul a Honda Civic. It had color coded mains and rods. Came from the factory with two or three different main and rod journal sizes. Also, I have known farmers who would do an overhaul and would have just the bad main or rod journals turned and polish the rest to save money. I would get some color coded plasti-gage and mic each one just to be sure.



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Nolan

12-18-2000 06:44:00




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
This is why I'm a fan of turning the engine over as I install each component. With each main bearing installation, turn the crank, with each rod, turn the crank. This way I can quickly detect and correct when I've got a problem. Be it a backwards bearing cap, a bent one, a bit of grit I didn't see, etc.

My recommendation would be to pull all your rod caps off and push them up out of the way, then try to rotate the crankshaft. If it's still essentially locked up, I'd pull the main caps and repeat. This will help you isolate the problem location and correct it.

Current engine builting practice is to not oil up the cylinder walls. The reasoning is that large quantities of oil on the wall get burned and coked up in the rings, leading to immediate sticking problems. Only a very light coating of oil on the wall is used. Seems to work quite well.

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Salmoneye

12-18-2000 06:38:57




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
Pack the oil pump with 'engine rebuild grease'.
It is oil soluble and will disipate quickly.
That is what you should be using when assembling the parts of the engine by the way...



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DBrown

12-18-2000 06:16:39




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
Make sure your rod caps and bearing caps are in the right direction. Been there done that with reversed main caps...it wouldn't budge.



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Jim in az

12-18-2000 06:02:17




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
Hi Alex I had the same problum. Tha machine shop sead I needid .030 main bearings well when I tightened them down I could not turn the crank so I took them out and miked them. I need .020 main bearings. Hope this helped you.



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Hilltopper

12-18-2000 05:57:22




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
Oil the cylinder walls. If that doesn't allow you to turn the engine then you may have put undersized inserts on a standard crank. Be careful here. You should be able to turn the engine with a breaker bar reasonably easy. Did you check your ring end gap clearance? Rings can be forced into the cylinder. Good luck.



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Claus

12-18-2000 06:03:34




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 Re: Re: Turning engine over during rebuild in reply to Hilltopper, 12-18-2000 05:57:22  
If it does not turn now (Without putting a gorilla on it) then it will not turn later when you try to start it. Start by getting some "Plastigage" from Napa and check out the bearing clearance. If that is ok, then check as prevously mentioned the ring clearance etc...
Happy Motoring
Claus



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Bill

12-18-2000 05:54:25




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 Re: Turning engine over during rebuild in reply to Alex Dula, 12-18-2000 05:45:28  
Seems like you may have some serious clearance problems. Are you sure your bearings are the right size? Did you clean the ring grooves on your piston rings prior to installing the rings on the pistons.

Good luck
Bill



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