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Discussion Starter #1
I keep reading these dire warnings to not replace just the lifters, because they are married to the camshaft and wear together. What kind of idiot engineer would make the lifter metal tougher than the head or cam metal? I just did my timing chain like 2 weeks ago, I dont want to take that all apart again. 151K miles
 

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Bueller? Bueller?
Timing will still be correct but you may get some noise(ticking) due to the new rods not seating that well on an old cam shaft. "Tougher" metal does not mean no wear, it means less wear but the wear pattern on mating parts will match so only replacing one would mean they don't mate.

You won't grenade your engine but will you be happy if you spend all that time replacing lifters only to have an annoying tick at all RPM ranges? Idk if I would be ok with that even on a weekend woods righ
 

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be like changing a bearing and not the race, I'd say if you do that, I'd go for just doin the lifters. You good at rollin the dice? good luck bob
 

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The lifters and cam are ground with specific finishes so they wear together for a perfect running fit. That is why you use break in oil and run a new cam in at a specific RPM for several min on the first startup. The lifters even have a slight dome to them so they rotate in the bore. New lifters may mate up with the old cam and wear in fine. Most times they will. It is important once a lifter is matted to a certain lobe to return it to that position. Please buy quality lifters there is a lot of crap out there and new lifters sometimes clatter right out of the box, even name brand ones. Use break in oil
 

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The camshaft does not necessarily need to be replaced when replacing lifters, and often times is not. In the case of a 4 cylinder, especially, I would replace lifters without doing the camshaft since you can replace the lifters without removing the head. On a 6 cylinder the head needs to be pulled, but as long as the camshaft lobes are in good condition, I wouldn't replace it.

I'm sure that there are a lot of people that sell parts that would disagree, but even the fsm makes no recommendation of replacing a cam shaft with lifters.
 

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For one or more sticky lifters yes but if the cam end of lifter is badly worn away your cam lobe is also. Badly worn


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The dire warnings stem from the fact that doing only half of a repair saves you money only in the short term. Trust me, I've tried to save money on construction projects and other repairs for many years. Some out of choice, some because I had no choice, there was no extra money for it.

If you don't replace all the worn components, the worn items will wear the new components prematurely. They are designed to work together and wear together. If you keep the Jeep for a couple of years, you'll probably never know the difference, but you move the burden over to the next owner. My Jeep has just those kinds of issues.

You'll likely suffer no major catastrophes. Repairs are completed like this with regularity in automotive shops, choices are made, shortcuts are taken. However, if you are 20 miles from a road - on a trail - and a new lifter fails, getting your Jeep out will cost more than the parts you should have replaced.

It's all about the risk.
 

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Discussion Starter #9
Thanks for the replies guys. The reason I'm replacing lifters is that my engine is ticking badly and trying to figure it out. So here's the deal, it looks like before I bought this Jeep a year ago, the "mechanic" that sold it to me did the lifters, maybe the cam. I seem to remember that in the ad, but he said a lot of stuff in the ad.....

Anyway, last night I got 4 lifters out. All were gummed up, and to even get those 4 out I had to put the cover back on and heat up the engine, then use an 8lb magnet tool to push them up and down till they broke free. The other 4 are still pretty stick in there. How can I get them out?? Thinking of putting some solvent in there.

The 4 I got out were all brand new looking with no wear, but varnished on the bottom. Should I clean and reuse them or just go with the new ones?

And can I clean out my lifter bore with a brush while the engine is all assembled? Or should I just drop in new lifters and hope they don't varnish? How can I safely clean the bore hole?
 

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The WORST thing that could possibly happen is that you'd open up a portal to hell unleashing demons upon us all destroying everything we love on Earth.

But you'll probably be fine. Seriously I've never heard of having to replace a camshaft... they don't wear out. The only time I've seen them replaced is to get a higher performance cam with higher lift and longer duration. Suck more air in that motor.
 

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A lifter stuck in the engine is not a bad lifter. They may get a little varnish on the outside but that has noting to do with it making noise. A hydraulic lifter has an internal piston and check valve the purpose is to remove all free play in the pushrod valve train using the oil pressure from the pump. If the INTERNAL piston and or check valve gets sticky it can get stuck or bleed down and cause lifter clatter
 

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I think your ability to replace just the lifters is going to depend on the condition of the cam. It sounds like your lifters and lifter bores maybe gummed up. Engine running too hot? Dirtily oil? Makes me wonder. You could clean up the lifter bores carefully with a little lacquer thinner and a rag. The lifters can also be freed up by soaking them in a fluid I just cant remember what kind and working them up and down in this solvent?fluied using a push rod as a plunger until free and clean. I had a dickens of a time purging the air out of my cooling system and until I got it it clattered greatly but that means the top end was running warm and causing sticking which can result in varnish. Do you think you have good oil flow, and cooling? If you cleaned everything up used good detergent oil and went towards a lighter oil maybe that would work. It sucks to take things apart then have to do it over again. so much work. Ideally I think I would try to isolate the offending lifter with a stethoscope then disassemble, clean and inspect the lifters and replace only the offending ones if after cleaning you think they are still looking problematic. Make sure you know which bore they came out of and use proper break-in methods when installing new lifters. Bob Harrison
 

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If the lifters were sticking and noisy, then a pint of ATF in the oil will usually free up hydraulic lifters, but if the lifters are worn or collapsed (and more than one can collapse), then replace them, but if they are collapsed, more than likely something else is happening in your engine.
 

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If the lifters were sticking and noisy, then a pint of ATF in the oil will usually free up hydraulic lifters, but if the lifters are worn or collapsed (and more than one can collapse), then replace them, but if they are collapsed, more than likely something else is happening in your engine.

I'm all for cleaning out the guts in the Jeep, but this freaks me out. How long should one run the ATF in the oil?
 

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Just curious - have you checked to make sure you don't have an exhaust leak? The cast exhaust manifold is notorious for cracking and mimicking the sound of lifter tick... we replaced the intake/exhaust manifold on our 4.0 when we had it out for overhaul, and it had a significant crack in it. Just thought I'd throw that out there...
 

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I'm I little late to this discussion but my first step would have been to try adjusting the valves per the manual. Since the lifters were replaced already, the initial adjustment may not have been done correctly. When adjusting hydraulic valves, the engine will stumble when doing the adjustment. Some people get uncomfortable with this and do not fully adjust them as required. Worth a shot.
 

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I have not specifically done it on a 4.0...but several times on V-8s but the rule for flat tappet cams is that you can always put new lifters on a used cam, but you never put used lifters on a new cam. And if you take the Cam and lifters out and plan to reuse keep the lifters paired up with the lobe that they came off of.
 

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I think it depends on the state of the lifters. I recently went through this also and I had my lifters pulled and replaced, on of the lifters was completely worn through. I didn't replace the cam with it and the ticking and misfiring came back within a week, I now have a remaned Jasper engine in it.
 
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