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Old 08-14-2016, 09:41 PM
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While valve cover is off.

I am a new jeep owner. I bought an '89 with a 4.2 in it. I am starting to get into different repairs and upgrades. I am mechanically good with my hands but this will be the first time I do more than the typical maintenance on a vehicle. My first question is while I have the valve cover off to replace the gasket, what else should I look into? The engine does currently have a tick or ping to it. How can I tell if it's a stuck lifter while I'm in there? I plan to do put on a HEI ignition and new carb in case it's the ignition causing the pinging. Thanks in advance

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Old 08-14-2016, 09:51 PM   #2
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On the 2.5L the lifters can apparently be changed with a lifter tool or magnetic pickup tool without removing the head. You can look into it for yours. My lifters were $4 each, I need 8 for my 4 banger. Tomorrow night they will be soaking in oil to be replaced.

I believe on the 4.0L the head has to be removed. Maybe the 4.2L doesn't need the head pulled. Check for play in the rocker arms, and for any loose bolts.

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Old 08-14-2016, 10:09 PM   #3
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You can also measure the distance each rocker arm moves as you slowly manually rotate the engine while the VC is off. A collapsed lifter isn't going to allow the rocker arm to travel as much as a lifter that's working properly.

I just did a set of lifters on a 3.0L 4 cylinder Mercruiser engine. The intake valve in cylinder #3 was the offending lifter which was quite apparent when I measured how much the rocker arms traveled.
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Old 08-15-2016, 09:27 PM   #4
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The 4.2 head has to be removed to access the lifters, if you go that route, I would just take the lifters apart and clean them really well if you can, since they are already broken in with the cam. Make sure that you mark where each lifter goes in relation to the cam..... i.e. put them back exactly where you removed them.

The first thing I would do before pulling the head would be replacing the timing chain with a Cloyes true roller, often times the "tick" you hear is the stretched timing chain hitting the timing cover, use a timing light and see if your timing moves around at a steady rpm, that will usually tell you if the timing chain is stretched to the point of affecting the timing in relation to the cam/crankshaft.
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Old 08-23-2016, 09:43 PM
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Thanks for taking the time. I have t gotten in to this yet but when I do I will take your suggestions. Thanks.
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Old 08-30-2016, 09:54 PM   #6
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I had the "2.5 TICK". I tried lucas additive, marvel mystery additive.No dice. Then I changed the lifters. It can be done by removing the rockers and using a magnet tool, or a snake grabber thing, but it's not that easy. Especially if the lifter drops down in there while you are trying to pull it out. It can be hard to see while laying over the open engine compartment with a flashlight. not fun. And it did not quiet the tick anyway. I had the motor rebuilt, and that solved it. Maybe check the timing chain like the previous poster said. I didn't check that.

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