I have a vortec motor 6.0 liter and it is knocking. Some have told me its rocker arms or maybe lifters. I have 315,548 miles on motor and 1 estimate of 1700 dollars to fix all lifters. Is this possible? I'm told its a high preformance motor with roller lifters.
If your engine is knocking the sound with be at the bottom of your oil pan but if you have lifter or rocker arm problems the sound will be at the top of your engine. One other thing you said your car has 315k it might be time to change your oil pump.
SOURCE: 2008 infiniti g37 motor is knocking has 16500 miles on it.
Please change the oil now at the Nissan garage and watch the vehicle closely.
$100 is not so much like getting your car totally knocked.
Good luck and rate this solution/ suggestion.
SOURCE: Loud ticking noise from motor
are you sitting down.........has someone been doing burn outs in the parking lot? sounds like a spun bearing. drop the oil pan a inspect all rod and main bearings.
SOURCE: Engine Knock on a 98 Isuzu Rodeo
Most likely it is a rod bearing and motor would have to be dissassembled to diagnose, you might want think about installing a low milege used replacment since it was run 5 quarts low on motor oil.
SOURCE: engine knocks at idle or low rpm, no load, no smoking or oil loss
Idle at 40 is fine. Do what I said and give it a chance to work...chances that an adjusting nut has loosened up is ) if it's a 4.0 (you didn't say) these have non adjustable valves. Any engine with adjustable valves uses "interference thread" nuts that do not back off.
SOURCE: how to tighten rocker arms
Does the clicking ever go away? valve adjustments are tricky and must be done in a certain sequence. It's best they be done by a knowledgeable mechanic or it can get all messed up. No offence. I'm not sure if the lifters are hydraiulic or solid. If hydraulic, a quart of dexron trans fluid in the oil should free up a sticking lifter. Watch your oil pressure and add only to clean oil and filter. Do not overfill engine. If it calls for 5 quarts then put 4 + the trans fluid. if it quiets down after running for about 10 minutes. a sticky lifter was your problem and crappy oil was the cause.
Good luck.and change the oil again whether it works or not within 50 miles.or once it clrars up.
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