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Old 05-19-2013, 06:01 PM   #1
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Unhappy 2.5 is knocking

just bought a 95 yj with the 2.5.1st jeep.122k miles. i get it home and im hearing a knock and eventually i figure out i can feel it in the distributor and this only happens at operating temperature. so i put a new one in hoping that its not cam related. there was excessive play in the old distributor but a new one didnt fix it and if i pull the new one towards the front of the vehicle and tighten it down at the same time the noise and and related vibration is slightly diminished. anyone know if the cam or the oil pump is more likely to cause a knock? is this a common problem? new to jeeps and new to online threads so my apologies if i am posting in an incorrect area or bringing up an old topic.

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Old 05-19-2013, 06:15 PM   #2
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The Distributor really should not have slack to move it but may be .010", if never heard of this.
Was the Gear on the old one worn a lot?

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Old 05-19-2013, 06:28 PM   #3
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I would look at wear on he gear of the distributor like previously stated. Also it could be the oil pump, thicker oil when cold less room for the pump to rattle around. Then when it warms up the oil thins and gives the pump room I guess could be a solution. But either way very uncommon of a place for knocking.
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Old 05-19-2013, 06:30 PM   #4
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it doesnt have much room to move but pulling it forward does cause it to quiet down. the old distributor has about .020" vertical play roughly the same side to side and the gear looks to have normal wear. the knock sounds to be half engine speed so i would guess cam unless oil pump rotates at the same speed.....?
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