1. #1
    cj7chase's Avatar
    cj7chase is offline Junior Member
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    cherokee ticking and oil pressure

    hey there, i have a new 1994 I6 4.0 cherokee that i recently bought. i just ordered out and mounted new 35" BFG KM2's on her. i went wheeling pretty hard as soon as i got the tires on. i now have a ticking noise that seems to be only when i am moving. it sounds similar to what my locker sounds like when i turn. perfect description would be that it sounds like a ratchet. it gets faster depending on my speed. once i get going fast enough i can no longer hear it though. also developed is a whacky oil pressure. as soon as i got the tires on i noticed that the oil pressure was basically never below 60. and certainly not below 50. right at start up it will idle at 40 but as soon as i get going it goes to 60ish. i figured this was semi normal because of my larger tires and the increased work load. i did notice that at higher speeds the oil gauge seems to fluctuate (before offroading). i drove the freeway yesterday (after i went wheelin) and noticed that the oil pressure was at or past 80. i was going a normal maintained speed but the gauge was "jumping" up and down kinda going crazy. it would go as low as 70 and then it would jump back up past 80. it would then sometimes even out and maintain at 50-60. my rpms are not crazy either. does anybody have any ideas on what it could be!!?? if you do try to include how to fix the issue if you can. and also if you can please try not to abbreviate anything without saying the full word as well. i'm newer and still trying to learn everything. thank you all!


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    Re: cherokee ticking and oil pressure

    also just noticed today that when i am going slow and i just barely touch the gas ever so slightly there is a kind of whirring almost a grinding sound. i will see if i can get videos of the noises when i get off of work and i will post them to give you a better understanding


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    Re: cherokee ticking and oil pressure

    Hoping the ticking Is not from eng the Oil pressure would be my first concern - that's a lot of PSI for a stock 4.0, I would install a mechanical gauge to confirm true pressure. A loaner tool I am told at some parts stores.

    Just tires - no suspension work recently done?

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    Re: cherokee ticking and oil pressure

    just drove home from work and the oil pressure was fine. only a 5 minute drive though. the tick was still very clearly there even in neutral and coasting i could hear/feel it. could the whacky oil pressure be caused by low oil? because yesterday i had checked the oil and seen that it was low. i added in about 1 1/2 quarts this morning. and so far the oil pressure has been doing okay. and correct just the tires. no suspension work was done so the drive line angles should be okay. i have a 5.5 lift with an slip yolk eliminator but i have never noticed the ticking before i went wheeling. also, there is the chance that the tick was there after i got the tires and before i went out. but i do not know because i was not paying attention to it. i was just focused on feeling my tires


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    Re: cherokee ticking and oil pressure

    i will see if the oil pressure is better. if i notice it getting weird again i will pick up a tool as you say


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    Re: cherokee ticking and oil pressure

    update: i tightened the flexplate bolts which i have read are a common cause of a light ticking in cherokees. the bolts were already tight and i drove it but the tick still remains any ideas?


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    Re: cherokee ticking and oil pressure

    OIL PRESSURE ISSUE:

    There should be no noticeable correlation between tire size and/or load on the motor with respect to oil pressure AT ANY GIVEN RPM. Any given RPM, in any normal driving situation, should yield approx. same oil pressure. However, engine temperature and oil temperature will affect oil pressure. Colder engine temperatures and colder oil temperatures will typically yield higher oil pressures. Also, max. oil pressure will normally be limited by internal oil pressure relief valve if not by overall oil circuit clearances (the overall circuut clearances increase as an engine wears). Also, a LOW enough oil level in the oil pan can yield LOWER than normal oil pressures (not higher) and will likely result in fluctuating oil pressures independent of RPM's. In this situation, aggressive turns and braking would likely result in momentary partial aeration and/or complete loss of oil pump prime resulting in plummeting oil pressure before recovering as the oil returns to cover the oil pump pickup again...

    Instead, sounds to me like the electrical connection to the oil pressure sending unit is faulty or the sending unit itself is faulty. As someone else already suggested, a mechanical gauge will tell you quickly whether that's true or not... Or, check the electrical connection at the sending unit and or replace the sending unit itself as they are not expensive... ;-)

    (I will try to address the clicking noise noise issue separately...)

    Regards,
    RR



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    Re: cherokee ticking and oil pressure

    hey there, so i always finally able to track down a sending unit. my orielly didn't have one, had to drive to the next town. did an oil and filter change, saw about 15 shavings of metal come out of the oil filter. there were no shavings stuck to the drain plug and none in the oil. there were just about 10-15 (i counted) in the filter. the oil was pretty dark but i've seen much worse. anyways, new sending unit is in and throughout driving and some decent wheeling today my oil pressure was great. it was a little high still in the beginning, about 50 idle and 60-70 while driving. but it evened out and is now at 40 on idle. and maybe 50 while hard accelerating. super relived that was the problem! thank you @restorationrides for that suggestion! now onto the ticking... i jacked up the jeep yesterday and spun the tires with my hands, i noticed that the rear driveshaft is slightly bent. i know that i did drop my drive shaft about a month ago due to the rear u joint breaking, in thinking it may have happened then. i am going to pick up a new driveshaft soon because that being bent obviously needs to be replaced, my question is: could that be what is causing the ticking? or maybe it could be the knuckle? i would love some help! thank you!


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