how do i break in my new engine? - JeepForum.com

 
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post #1 of 14 Old 09-03-2013, 06:21 AM Thread Starter
brettgorringe
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2001 XJ Cherokee 
 
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how do i break in my new engine?

So my 01 xj had low to none oil pressure do to bad main and rod bearings. Also do to the cracked head witch let violent into the oil. Fixed the head but that's it. So after procrastination it started knolking really bad so I pulled the oi. pan off and noticed that 3 of my rod connections were loose one of them really loose. So I took them off to inspect the journals and stuff and I couldent find the bearing haha
. What was left of it was fuesed together into one solid piese so I finally got it off and its scratched up way bad. You can feel big bumps with your thumb nail. Solo after going over all the cost its more with it to buy a new proformance engine from auto zone. I hear its a good engine with a 3 year warranty. I want any advice I can get on the removal and install off the engine. And break in stuff??

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post #2 of 14 Old 09-03-2013, 07:00 AM
TCrow2
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All I know about breaking in an engine is to fluctuate your speed every few minutes on the highway. Like don't just cruise at 65 the whole time.
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post #3 of 14 Old 09-03-2013, 12:15 PM Thread Starter
brettgorringe
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Really that's weird. Do you know why
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post #4 of 14 Old 09-03-2013, 01:17 PM
bigbill888
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Get used engine at junkyard.

96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
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post #5 of 14 Old 09-03-2013, 01:54 PM Thread Starter
brettgorringe
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That's not what I asked haha funny
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post #6 of 14 Old 09-03-2013, 01:59 PM
jminty
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Ive also heard that working the engine but not revving it too high is good procedure. Like pulling a trailer around from the first time you drive it. Apparently initial break in happens in the first few miles.
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post #7 of 14 Old 09-03-2013, 02:08 PM
wgirvine
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Let me see if I got this straight... You have a Jeep with a destroyed engine. You don't have a new engine, or even a plan to fix the old engine. And you're worried about how to break in a new/rebuilt engine?

First things first, eh?

The road goes on forever, the party never ends....
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post #8 of 14 Old 09-03-2013, 02:22 PM
88_yj
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When you install the new engine first startup you will have to rev it up to 2000-2500 and hold it for close to 30 mins to break in the cam and rings. It's best to change Rpms every 5 mins keeping it between 2000-2500.

Before you install the new distributor you need to make sure and prime the oil pump otherwise the life of your bearings is decreased by 75%


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post #9 of 14 Old 09-03-2013, 02:24 PM
88_yj
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Make sure you take lots of pictures as you tear it down so you have something to look back at when you can't remember where a plug goes or bracket. And place all bolts in separate ziplock bags labeling the bag



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post #10 of 14 Old 09-03-2013, 06:52 PM Thread Starter
brettgorringe
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U have the new engine and almost the old one out. Iv heard that I have go drive no faster then 50mph for the first like 5000 miles or something us that true?
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post #11 of 14 Old 09-03-2013, 06:56 PM Thread Starter
brettgorringe
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And I've also heard I have to change the oil at 500 then 1000 then 3000 miles
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post #12 of 14 Old 09-03-2013, 07:15 PM
88_yj
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For the first 5000 your not suppose to drive it long distances at a steady speed and you will need to change the oil at 500 1000 and then every 3000. You need to change the oil more often because a new engine will have a little more metal in the oil from it breaking in.


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post #13 of 14 Old 09-03-2013, 07:30 PM
CCKen
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Quote:
Originally Posted by brettgorringe View Post
And I've also heard I have to change the oil at 500 then 1000 then 3000 miles
Have you bothered to search the internet to see if you can find break-in procedures?

Most camshaft manufacturers have break-in procedures for their canshafts/lifters, but little is said about piston ring break-in, which is totally different. You must do both by the book or you'll have a basket case on your hands in about 1,000 miles.

You'll get many different answers on the forum(s) on how to do it, most of which are way off base.

"The blind lead the blind? Shall they not both fall into the ditch."

Check the internet out and come back with a detailed description on what the procedures are so that we all don't fall into the ditch.
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post #14 of 14 Old 09-03-2013, 07:46 PM
raypla
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I heard your supposed to drive it like you stole it , or else it'll never go right.

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