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Idahome
Joined: Wed May 2nd, 2018
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If it develops after its warm its usually a lower end knock like a rod or bearing? or?
Heck it may just be an exhaust leak, if I was there I could help you determine its source!
Cat converter could have something loose inside of it? (Have seen whole bolts down in there)
Exhaust manifold to Y pipe connection have no gasket in them, the whole Y pipe must be lined up perfectly and tightened down evenly. An Exhaust leak will show itself over time with black soot
What steps can we take to pinpoint the noise?
Do you have any friends that can help?
I know I have driven engines around making worse noises then you describe, heck some 4.0L I know make ticking/lifter noise all the time and are still going... the OHV 4.0 is one tough sob!
Ticking sound to me sounds like exhaust leak, tick tick tick
It can also be an injector not firing (obvious miss)
It can be a rotational noise in the serpentine system (remove belt and see if it is effected)
It can be a wrist pin on the bottom of a piston making noise
it can be something in the valve train
If noise is at back of engine it can be cam synchronizer
If it is at top of engine (valve cover) then it may be your top end pushrod/lifters/rockers
If it is at oil pan it points to lower end rotating assembly problem, on 4.0 the piston connecting rod and piston wrist pin can make ticking noises and still run forever
It can be very hard to pinpoint, but it can be done
A mechanics stethoscope is a good way to find it...
Fun climbing all around hot engine bays isn't it!!
Your hunch is to run some thicker oil, I am a firm believer of listening to my customers and their hunches. If it shows up when its warm and the oil thins out then you might try adding some Lucas petroleum jelly and see if it thickens up the oil and lessens the noise. Do this before your next oil change
We are looking to eliminate things that can be the noise so we can find out what is making it
Last edited on Sun Oct 21st, 2018 10:30 am by 410customs
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks