Today I visited a engine rebuilding shop and the owner gave me his instruction sheet for breaking in a newly rebuilt engine, some neat points and I will post this using his exact writing instruction sheet.
Adjust lifters, carburators and timing as close as possible before starting Remove the coil wire and build oil pressure before starting the engine Start engine and observe oil pressure gauge and set engine speed for 25mph until normal operating temp is attained, observe oil pressure & engine temp and run engine at this speed for several minutes, shut engine down and retorque cyclinder head & manifolds Recheck carb adjustment, valve adjustment & timing (Valve seating may cause valves to tighten) Repeat starting procedure as above (build oil pressure first) After starting motor make a test run at 30 MPH and accelerate rapidly to 50mph doing this at least 10 times. If traffic conditions do not permit this procedure, accelerate the engine rapidly several times through the intermediate gears during the check run In town driving is ideal for breaking in new motors. The first 0-100 miles should be accomplished with short burst of speed, the object is to apply a load to the engine for a short period of time and in rapid succession, soon after engine warm up. This action thrusts the piston rings against the cyclinder walls with increased pressure and accelerated ring seating, during the engines first 0/100 miles the engine should not be allowed to "coast" continually (such as flat highway driving), more importantly DO-NOT allow the engine to lug or overload for the first 500 miles. Towing or driving in mountainous terrain is a terrbile way to break-in a new motor. Your motor should never be allowed to "pink" from carrying a load, "Especially before it is completely broken in". Most engines break-in between 500 to 1000 miles, readjustments may be required at that time to the carbs, ignition and valves, and manifolds. I thought this was very interesting especially the short bursts of speed and in-town driving, he says oil pressure and normal temp are a must for good engine break-in and the total life of the engine. "FT" /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
