Break in Procedure

[WillyG]

Bill,

How should I break in the new top end on my 787?

[HX RACER]

Hold that sucker wide open!!! lol

[AC 46]

Got to agree.get it warm re torque. And let her rip. Break it in fast = go fast. In my own foolish opinion.

[Mr. Bill]

What you want to do is ride it normally, but fluxuate your throttle position for the first hour or so. Do not be afraid to go up to max rpm for short bursts of time.

The rings rely on the compression to expand them, and the sharp edges of the crosscut honing job will seat the rings. This happens better above 1/2 throttle when the clyinder pressures are higher and exerting more outward force on the top ring.

The first time out, run it for an hour or so, let it cool completely until it is cold, then retorqure the clyinder bolts and/or the head bolts.

[WillyG]

Thanks Bill

[Mr. Bill]

Do not go nuts adding "break-in oil ". Too much oil will delay the seating of the rings and then the clyinder walls and the rings glaze over and never seal as well as they should.

[WillyG]

Bill, will one tank of 50:1 plus the oil injection be too much oil?

[Mr. Bill]

Yes.
The oil injection will provide plenty of oil.

[WillyG]

I have replaced the oil injection hoses going from the pump to the rotary valve cover though and they have no oil in them, is there a way to bleed them without running the engine?

[Mr. Bill]

Yes. Bleed the oil pump. Remove the sparkplugs. Hold the oil linkage wide open. Use the starter motor to fill the two small oil lines.