I just bought an 88 ford ranger 4x4 4spd od 2.9 . At first it sounded like a sowing machine so my son and I changed the lifters and push rods and found one lifter colapsed. Well after filling it back up with 20w50 oil and adjusting the rockers it sounded nice. Then after warm up I noticed the oil pressure dropped from 40 down to 20 then at idle it goes down to 5. And it has a valve tap. One person tells me it could be a spun bearing another says pump this truck has 170,000 miles. help
I just bought a BII with famous tick..........oil pressure light came on (no gauge). I installed mechanic gauge and showed 5 psi so I decided to replace oil pump. Pulled pan off (not fun!) the pickup tube was clogged and the was part of the timing chain tensioner in pan. I then pulled timing cover off only to find chain streched and the chain guide and tensioner pretty much gone. I think tick was chain slap..........will know for sure in a couple days.
Possibly clearances "closing" at operating temparature? 20w50? Kinda heavy isn't it?Spun bearing - should make more noise than a "Tap"? I've heard several low and high mileage 2.9 engines "tap" but quits after warm up? That SEEMS to be somewhat common with the2.9 Sorry can't be more specific.
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A lifter problem can only be fixed by changing the lifter. You might as well change all of them because it is just as easy since you have already had to take the heads off to get at the noisy lifter. While you are at it, get the heads reconditioned or a valve job. More than likely the oil was not changed as often as it should have been. Dirty oil works like sand paper on the valve stems.
You may not have a lifter noise. I seem to recall reading about the 4.0L (not sure if its just 4.0L that were affected or sure about years affected as well) having bad push rods that would mushroom on the tips and cause what sounds like a lifter noise.
They would need to be inspected to know for sure. And if this is the case some hardened push rods should be installed as well as rockers. The rockers could be damaged from the push rods and they also wear in with the push rods so old rockers and new push rods may not mate well.
Take the plastic cover from around the steering column. There's a small hole under the lock Inside the hole is a small button you need to push in on which should release the lock cylinder. The key has to be in the switch. If that doesn't work, theres a thin metal rod that goes into the electrical of swirch. You need to remove it than try to turn the key. Than push in on the little button while trying to remove the lock .
if its an ohv type the most common fault is that the oil ways to the rocker shafts become blocked
so get some flushing oil drain the oil and replace with the flushing oil and run for the time stayed on the can then Change to good quality oil and new filter
then remove the rocker covers and check and adjust the valve clearances
if its an ohc type its all hydraulic adjustment
you could try flushing as above but apart from that the only other way is to change the lifters and followers
hope this helps
The camshaft may be worn or the lifters .that explains the missing when you run it at operating temp.By the description of the oil. the reasomn the canmshaft wore out and the valve lifters is because the oil was not changed on a regular basis.