Hi,
Rod Bearings ?
I very much doubt it.
An audible tick is more likely to be the start of Cambelt fray - so needs inspection. If this is ok, then check your valve clearances. This is the next most likely cause of ticking sounds.
If they are ok, it could be a damaged valve. Testing compression will find this before stripping anything off to look.
A broken piston ring can also cause ticking noises.
Piston bearings create more of a knocking sound (piston slap), and can be identified via spark plug hole.
Rod bearings don't make a ticking sound, they make a knocking sound. If the ticking is coming from the top of the engine and speeds up with engine rpm's, that's valve lifters ticking.
If you haven't done an oil change lately, try that first.
Not neccessarily. Have it diagnosed first. The ticking could be many different things. Bearings are one, lifters another or could be not internal engine, may be external. You also need to find out why its doing what it doing otherwise you will waste money fixing something and end up doing it again..
SOURCE: ticking noise
Ok, if you have it narrowed it down to a specific area, try narrowing it down further by using a long (2foot or more) extension or screwdriveras a "stethescope". Hold one one end against your head in front of your ear and probe different areas near the noise 'till you hear it the loudest, (I'm not kidding... this works) Be careful where you put the probe... the engine is running... stay away from drive belts and any other rotating stuff!
With what you have said, I'm sort of leaning towards a valve lifter at this point. PS: which engine is this?
The oil pressure thing concerns me... What is the exact pressure at idle hot and cold? what about at 1500rpm? If you have not been doing regualr oil changes, you could have something simple like gummy residue. If you have been using a high parafin based oil (usually really cheap stuff) this can happen even with properly timed oil changes. (once saw an engine with similar miles with enough sludge in it to make two softball sized globs just using what I found inside the valve covers, yet oil was changed every 3000 miles!) Though I don't like promoting products, I recommend changing your oil now, using any good synthetic and a pint of Marvel oil +good oil filter. (unless you have been using similar all along) See if after a few days the fluctuations in pressure and noise diminish somewhat. Get back to me on questions I asked.
Good Luck
SOURCE: loud ticking
ROD Bearings DO NOT "TICK" They KNOCK Loud believe Me You Would Know it if it Was A ROD Knocking. I would Advise you Check your OIL Pressure Manualy as the Oil Pump Can Contribute to the Problem you Are Describing
SOURCE: engine ticking new rods, pistons, timing belt... help
check oil pressure sound like lifters.they could be stop up with trash .keeping them from getting oil.
SOURCE: engine not failed oil pressure good engine ticking
hold up rod bearings were did you get that?lets take it from the top.camshaft lobs move lifters on rotation,which lifters move push rods,push rods push valves up and down,which other side of valves push up and down valve stems,which open and close exhaust and intake stems.ok now were clear on that to see your push rods.take off your valve covers on side with tick.1.check for valve loosness.need a feeler gauge for this and specs for you truck to do this.because ticking is mostly associated with valve loosness or to tight.2.if rod is bad loosin valves but not off and inspect the rods for bends.on a flat surface.replace if bend.also make sure they to go back in same place.and repeat step 1.finally noise continues need to take in and checked possible internal damage.
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