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Old 01-26-2014, 09:20 AM   #1
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Refurbished 4.0 break-in

Putting a refurbished ATK 4.0 in my jeep soon. Just wondering; is there any break-in required? Thinner oil? Early oil/filter change? I normally change my oil around 3,000 miles. But with this engine i'm gonna be running full synth so I'm gonna bump that up to around 4,000 or 5,000.

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Old 01-26-2014, 09:44 AM   #2
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There are lots of different opinions on this. I know how I break in a new rebuild, and if I bought an engine from, say ATK, I'd follow their break in procedure.

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Old 01-26-2014, 10:39 AM   #3
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They have break in oil im pretty sure. I can tell you that its important to get it up to about 2500 rpm right off the bat so you dont flatten cam lobes and you get the rings to seat. After the 20 minute run time you should dump the oil to get all the moly lube out then fill with the oil you plan to use. Filter also. Id do another oil change at the 500 mark also.
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Old 01-26-2014, 07:20 PM   #4
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They have break in oil im pretty sure. I can tell you that its important to get it up to about 2500 rpm right off the bat so you dont flatten cam lobes and you get the rings to seat. After the 20 minute run time you should dump the oil to get all the moly lube out then fill with the oil you plan to use. Filter also. Id do another oil change at the 500 mark also.
So does the mean they include 6 quarts of a special oil? I was under the impression that it would be without an oil pan. Thus, no way to contain oil until you build it.
And when you say get It up to 2500 RPMs off the bat, do you mean the first time I start it? For how long?
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Old 01-26-2014, 07:37 PM   #5
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Follow their recommendations

Basic stuff most people recommend

No synthetic oil for break in

Vary rpm but no high revs during early brake in but also not constant rpm for Break in

Finally early oil and filter change the first time to remove the crap that gets scraped off in break in
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Old 01-27-2014, 12:03 PM   #6
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My engine came in today. Their booklet didn't say anything about what kind of oil. So I'm going to assume it doesn't matter too much. It does say to lay on the pedal for 2k RPMs for 20 minutes.
Also, why not synthetic?
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Old 01-27-2014, 12:16 PM   #7
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Two reasons I have been told

May lubricate too well for proper break in of surfaces that need to wear in on each other
As I recall even some literature from FORD recommending no synthetic for first few thousand miles

Too expensive for short use as early changeout recommended with brand new engine sine some metal is ahead with proper break in
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Old 01-27-2014, 01:47 PM   #8
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Two months ago my son and I installed a Sure Fire 4.0 long block in his '00 TJ. The recommended break in procedure from the re-manufacturer was:
Fill with 6qts 5w30 conventional oil and filter.
Prime oil pump.
When ready start engine and confirm oil pressure.
Immediately raise to 2000rpm for 20mins while monitoring engine vitals. (I used a zip tie from the cable bracket to the throttle arm to maintain rpm).
No long trips or extended continuous rpms for 500mi.
Change oil and filter @ 500mi. Drive normally.
The swap is detailed in his build thread starting with post 66.
Tub replacement and restoration
Any questions post em up. Good luck!
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Old 01-27-2014, 07:11 PM   #9
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My engine came in today. Their booklet didn't say anything about what kind of oil. So I'm going to assume it doesn't matter too much. It does say to lay on the pedal for 2k RPMs for 20 minutes.
Also, why not synthetic?
2000 rpm for 20 minutes and buy break in oil it has a higher zinc, change the oil and the filter after the 20 minutes with 10/30 conventional oil then after 2000 miles change oil and filter with synthetic. You do this and your motor will love you for years to come.
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Old 01-27-2014, 07:16 PM   #10
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11487 Royal Purple 10W30 Break-in Engine Motor Oil
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Old 01-28-2014, 12:00 AM   #11
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Alright, thanks everyone! Now that I know that royal purple has a special break-in oil, I guess I'll be picking up some of that. Then I'll run conventional oil for a while(500 or 2000 miles?) before I change to full synthetic.
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Old 01-28-2014, 09:16 AM   #12
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Alright, thanks everyone! Now that I know that royal purple has a special break-in oil, I guess I'll be picking up some of that. Then I'll run conventional oil for a while(500 or 2000 miles?) before I change to full synthetic.
2000 miles before changing to synthetic
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Old 01-28-2014, 12:15 PM   #13
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I've have had good luck with joe Gibbs break in oil
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Old 01-28-2014, 01:15 PM   #14
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summit racing sells lucas break in oil for just under $6/quart

if you order something else to get to minimum free shipping amt that is about the best deal for the high zinc oil I have found
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Old 01-28-2014, 04:42 PM   #15
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I couldn't find the royal purple break in oil at my local advance auto. The only thing they have is the Lucas break-in oil additive. Gonna try napa for any sort of break-in oil. If I can't locate any, how does the additive work? I'd hate to have my engine completely re-assembled and be missing just the oil because I'm waiting for it in the mail...
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Old 01-28-2014, 04:50 PM   #16
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I couldn't find the royal purple break in oil at my local advance auto. The only thing they have is the Lucas break-in oil additive. Gonna try napa for any sort of break-in oil. If I can't locate any, how does the additive work? I'd hate to have my engine completely re-assembled and be missing just the oil because I'm waiting for it in the mail...
The additive has the Zinc you need
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Old 01-28-2014, 04:56 PM   #17
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I'd suggest you follow what the engine builder says to do with it.....just, just, just in case you ever have problems with it before the warranty runs out.
They should have given you the "orders" to follow.
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Old 01-28-2014, 05:27 PM   #18
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My re-man was supplied with oil pump, gaskets, oil, and filter.
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Old 01-28-2014, 06:51 PM   #19
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I couldn't find the royal purple break in oil at my local advance auto. The only thing they have is the Lucas break-in oil additive. Gonna try napa for any sort of break-in oil. If I can't locate any, how does the additive work? I'd hate to have my engine completely re-assembled and be missing just the oil because I'm waiting for it in the mail...
O'reilys will have it for you with in 24 hours if you go pay for it. Personally not a fan of lucas anything.
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Old 01-28-2014, 08:26 PM   #20
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O'reilys will have it for you with in 24 hours if you go pay for it. Personally not a fan of lucas anything.
Shame no o'reilys around here. We get their commercials on the radio but no stores within 100 miles...
The manufacturer didn't specify much about break-in besides revving at 2k RPMs off the bat for 20 minutes while watching the engine vitals. That's why I came here for advice on oil weight/type/frequency of changes. I seem to have it all straightened out besides locating some break-in oil.

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My re-man was supplied with oil pump, gaskets, oil, and filter.

Odd, mine had the pump & gaskets(was able to return 50 bucks of them to advance thanks to that). Odd part is no oil, and no strainer for the pump(despite them stressing not to use your old one or it will void the warranty).
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Old 01-28-2014, 08:52 PM   #21
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Not much to the oil pickup tube and strainer. We just cleaned the existing one in the parts washer and pressed it into the new pump.
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Old 01-28-2014, 10:16 PM   #22
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Not much to the oil pickup tube and strainer. We just cleaned the existing one in the parts washer and pressed it into the new pump.
Wish I had a parts washer. I just picked up a new strainer for 20 bucks. I like new parts, and it's good peace of mind
That's another dilemma I'm faced with; need to pick up a special tool to press the tube onto the pump. Gonna' see if advance will rent it to me.
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Old 01-29-2014, 05:46 AM   #23
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I didn't use any special tool. I padded my bench vice and secured the OP there. Looking at the OP you will see how to position so as not to damage it. Then I wrapped small rag around the pickup tube above the lip. I took a pair of curved jaw vice grips and clamped them so they just fit snug on the tube using the rag as a cushion. I then tapped the vice grips with a dead blow hammer to "press" the pickup tube into the OP.
Did you read the link I posted above? Lots of useful info there.
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Old 01-29-2014, 07:04 AM   #24
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Take the tube, put it in the vice with the little lip above the jaws. Hold the pump where you want it to go. And wack it with a rubber hammer
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Old 01-29-2014, 01:12 PM   #25
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Take the tube, put it in the vice with the little lip above the jaws. Hold the pump where you want it to go. And wack it with a rubber hammer
Someone at napa today mentioned freezing the tube and tapping it in with a hammer and a brass punch. I might need to combine the ideas to try to get it in.

Napa could have ordered the royal purple break-in oil from another store, however it's 10 bucks a quart. I'm not apt to spend that much on something that'll be in my engine for 20 minutes. I think I'll go with some normal conventional oil with the Lucas additive. The guy mentioned using a lighter oil(5w-20) with the additive then switching to 10w30 conventional for the first change. This a good idea?
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Old 01-29-2014, 03:18 PM   #26
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Mine came with Quaker State 5W30 conventional.
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Old 01-29-2014, 04:27 PM   #27
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I personally would not even consider breaking in a flat tappet engine (like the 4.0) without using oil that has a high ZDDP content.

Make sure ya prime the oil pump also.
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Old 01-29-2014, 06:12 PM   #28
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I put an ATK in my 97 summer before last. We put Quaker State 5W30 in her and I put 500 miles on it varying speeds /RPM's changed the oil then hit the road. Engine has been rock solid and quiet ever since. Based on all the above comments I should have done more to properly break it in. i broke it in like any new car I have ever bought.
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Old 01-29-2014, 07:59 PM   #29
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I put an ATK in my 97 summer before last. We put Quaker State 5W30 in her and I put 500 miles on it varying speeds /RPM's changed the oil then hit the road. Engine has been rock solid and quiet ever since. Based on all the above comments I should have done more to properly break it in. i broke it in like any new car I have ever bought.
This is what the re-man directed for our engine and we followed it to the T. Wouldn't want to void the 3yr unlimited mile warranty.

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