Engine Break-In
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Junior User
Joined: Nov 2004
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Engine Break-In
I just broke in the camshaft on my 78F250 w/400. The engine was re-built ground up so everything is new/machined. I was wonder on how to break it in now before my 500mile oil change. The mechanic that assembled it told me to break it in with my foot to the floor so if something is gonna go wrong then at least it will be close to my garage. all he builds is 1/4 mile engines. I have heard to break it in how im going to be driving it. but this truck is a weekend bogger and when its out it is running redline most of the day. so how does everyone else break in there engine?
Senior User
Joined: May 2004
Posts: 207
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From: Wisconsin
most of what i've read says that (after breaking in the camshaft) you should vary the engine's speed and avoid hard acceleration during the initial break in procedure. never heard the floor it method before. maybe your mechanic just wants more work/$$ from you??
Junior User
Joined: Apr 2005
Posts: 98
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From: Whitehorse Yukon
This is how i do it and i have over 25yrs of engine building to my credit. When i was young and i built my first motor i read the hastings ring package and have done it that way ever since. Accelerate from a dead stop , do not exceed 3000rpm or any more than part throttle, slight hill will help,i find most vehicles driven at part throttle will **** at an appropriate rpm.when slowing down manually downshift so the engine does some braking, this will draw oil up around the rings.. Do this 8 to 10 times. After that drive normally, preferably a highway jaunt not just around town and vary your speed.The issue here is not the vehicle speed but engine speed so if you have low gears(numerically high) drive accordingly and try not to exceed 3000rpm. After 500 miles drop the oil and then you are good to go.
The only time i would run a fresh engine hard is if it is built with loose tolerances as in a race motor.
Disclaimer:
Everyone has their opinion and this is in no way a hard and fast rule just what has worked for me for quite a few years and have never had one come back with oil burning issues.
The only time i would run a fresh engine hard is if it is built with loose tolerances as in a race motor.
Disclaimer:
Everyone has their opinion and this is in no way a hard and fast rule just what has worked for me for quite a few years and have never had one come back with oil burning issues.
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