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#1
12-06-2010, 01:47 AM
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High engine knock 1999 g cherokee
I have a 1999 4.7 grand cherokee with 181000 miles. Started hearing knock in engine 2 weeks ago. It sounds louder on passenger side and higher towards head rather than lower around crank. The sound hasn't gotten any worse. I don't have much experience with sohc engines. Could this sound have anything to do with the valve train or is it just wishful thinking that it is'nt a rod?
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#2
12-07-2010, 08:27 AM
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Re: High engine knock 1999 g cherokee
An engine bearing would be a deeper klok klok klok from lower down, so from your description it sounds like valvetrain noise.
Has the temperature in your area suddenly gone colder in the last 2 weeks? What grade of motor oil are you using? A heavier oil in colder temps can cause valvetrain noise.
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Ours: 2020 Jeep Wrangler 2.0, 53k 2013 Toyota FJ Cruiser, 84k Kids: 2005 Honda CRV, 228k
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#3
12-08-2010, 02:13 PM
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Re: High engine knock 1999 g cherokee
Early model 4.7s had a problem with the upper cylinder heads clogging up and destroying the cam bearings and/or camshaft(s). You won't really know what the condition of the engine is until you pull off a valve cover. If you see sludge, you'll need new heads.
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Daily Overhauls Do Get Expensive Dangerous On Days Gears Engage Dead On Day Guarantee Expires Dead Or Dying Gas Eater Department Of Defense Garbage Equipment Dodge Owners Don't Get Excited Don't Overdrive Gutless Engine Drips Oil Drops Grease Everywhere 1995 Dodge Dakota SLT 3.9 V6 1995 Jeep Grand Cherokee Laredo 5.2 V8 4X4
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#4
12-08-2010, 06:51 PM
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Re: High engine knock 1999 g cherokee
Do a compression test on all cylinders on suspected Bank.
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