Re: H engine rebuild--timing.

Posted by riverbend on February 11, 2007 at 18:28:46 from (208.160.33.179):

In Reply to: Re: H engine rebuild--timing. posted by Tom Windsor on February 11, 2007 at 09:13:48:

Ah, good.

When you torque down the head keep going around in the spiral pattern until every head bolt holds 65 lb. ft. of torque. If you only do it once, the center bolts will be too loose.

If you have not done so, check that the cam lobes are all within 0.020" of 0.202" lift for a standard H). If not, the cam and lifters should be reground. Going to 0.240" lift makes a nice increase in power.

Also remember to put clean oil in the air cleaner.

Before you start the motor, leave the plugs out and spin it over with the starter until the oil pressure starts to come up. Listen for any funny noises.

To run in the engine, 1) run it about 1600 rpm for 15 minutes at no load. 2)run it a ~1780 rpm for 15 minutes at 1/2 load (I drove mine up and down the road in 4th gear) 3)run it at ~1750 rpm for 15 minutes at 3/4 load (mowed corn stalks). Instructions say 2 hours would be better.

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