Is this knock? 99 2.5L 5mt w/45K jasper motor VIDEO - Jeep Wrangler Forum
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Old 06-07-2013, 07:21 PM   #1
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Is this knock? 99 2.5L 5mt w/45K jasper motor VIDEO

I got the jeep with a blown motor for $200 a year and a half ago, I bought a motor for another $500 around the same time. Yesterday I finally got to swapping the motors.

I primed the oil system very well, multiple cranks etc..

On initial start up the motor "knocked or ticked" loudly. As the temperature rose, the sound faded quite a bit. If I blip the throttle it'll make the sound for a few reveloutions, then go away. Also while I am driving, it'll come at low speed load and disappear at less load higher speed...

Knock, lifters what!? You can hear it right after the u turn as I am coming up the slight hill...sound goes away at 27 second though?


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Old 06-07-2013, 07:39 PM   #2
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Sounds a lot like a collapsed or sticking lifter to me. That can happen to a stored engine that wasn't properly pickled... you may want to pull the valve cover and see if there are any loose rockers.. rod knock usually doesn't go away.

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Old 06-07-2013, 07:49 PM   #3
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Nice thanks for that heads up is there a procedure write up to follow?
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Old 06-07-2013, 08:15 PM   #4
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Not really a procedure, per-say , If you have a Chilton's or Haynes manual they have a section on hydraulic lifter removal in the engine section. It talks about dealing with noisy lifters.

One cheap and no-disassembly test is to get a 2 or 3 ft section of hose our tubing (about 3/8 or 1/2 in diam ) and use it like a stethoscope. Hold one end to your ear and place the other open end on the valve cover over each cylinder one at a time with the engine idling. You can hear all sorts of the mechanical sounds. Inf you have a lifter or rocker issue you'll hear it real clear as a click or tac sound when you put the hose over the affected cylinder. If they all sound the same, you can put the front end up on jack stands, again let the engine idle and use the hose stethoscope along the block-pan joint. A rod will sound like somebody's inside tapping away with a little hammer.

Just one note... BE CAREFUL!!! Working under or around a running engine is a whole lotta hurt just waiting to happen... fans, exhaust pipes, etc can and will hurt..
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Old 06-07-2013, 08:33 PM   #5
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Great info - ill report back at the end of this weekend.

Thanks again.
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Old 06-07-2013, 08:50 PM   #6
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Good luck and hopefully it's only a cheap and easy fix you need.
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Old 06-08-2013, 11:11 AM   #7
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Its mechanical, not detonation / pre ignition.

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