Break in procedure
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Joined: Jul 2003
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From: Eureka, Ca.
Break in procedure
What is the best way to break in a new engine? The block was bored and honed, new pistons and cam/lifters. Can you ruin a engine by cranking it too much the first time you try to start it? I am worried about the cylinder walls and rings.
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the way engines are machined now, slow and steady is no longer in for break in. when you get it running and tuned up, take it out on the road, and put the screws to it, ie put a good load on the engind to seat the rings, or it will burn oil forever. this process is the same for most new engines. On new tractors, we will put them on a dyno, and pull max load for an hour or more if we have time to brake them in. be sure to change the oil within a reasonable amount of time to drain break in shavings. use your normal motor oil for break in. If you used sticky assembly lube to assemble your engine, you should be able to crank i a long time before it runs. Also, did you prime the lube system with a drill or pressure luber after you assembled and put oil in? this will make it so oil will flow through the galleys when you 're doing your pre start up adjustments
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From: Maple Ridge BC Canada
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Joined: Feb 2001
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From: Missouri
If your cylinders were honed properly for the rings you have then they should seat a few minutes after startup. The big worry is getting the cam and lifters to break in. Excessive cranking can casue camshaft failures. I try to get them started very quickly and bring the rpms up to 1500 and then rev it slowly to 2500 and then slowly back down to 1500. I do this for about 30 minutes. You need to watch the temp closely as it will tend to get up there a ways. Make sure your radiator has set full of water for at least a few hours to ensure all the air pockets are out of the system. After 30 minutes I change the oil. I take it easy on the engine for about 500 miles at least but some say you can rip on them hard right after the 30 minute breakin period with no ill effects. I would never take the screws to a brand new engine right after it fires up. You need to listen to it for a while and make sure everything sounds right. Whatever you do, do not let the enigne idle down all the way for the first 30 minutes. You need enough RPMs to keep the lifters spinning but not enough to turn small problems into bigger ones.
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