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Engine hard to rotate 120-130

posted by  Rhys on  Sun Oct 23 20:06 CST 2011
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

You have perhaps limited experience with rebuilt engines. Piston speed ( from a standpoint of geometry) is greatest in the first 90 degrees after TDC. With new rings on a freshly honed cylinder, that's when friction will be highest too. I'm assuming the spark plugs are not installed.
So it sounds normal to me. As long as the rotation is smooth, without "sticky" areas, it will be fine. Certainly the engine will require greater and lesser torque to rotate through 360 degrees.
With a breaker bar on the crank pulley bolt you should be able to rotate the engine with two fingers and some effort.
If the ring gap was non-existent, you would never have been able to install the pistons.
Oil the cylinders and rotate the engine with a breaker bar a few times - you'll get a feel for what's happening quick enough.





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