Engine Noise

K

KenBolton

Senior Member
After my pickup sets for several days the engine clatters on startup. Is has less than 1,000 miles on an overhaul. After running30-40 seconds it quotes down. Could this be lifters? If so why do they drain down to this point?
 
It's more likely to be from lack of oil to the main bearings, it takes time for oil to get to them. This should not happen on a new engine.
 
My random guess is piston slap. From standard pistons put into slightly oversize/out of round bores, until pistons warm up a bit. Will it do this over night or only after setting a couple days?
 
Good afternoon...You might consider trurning the engine over with the starter, while the ignition off, for a minute or two in order to get oil moving. Then turn the ignition on and fire the old girl up. This approach can quiet the engine quite a bit at start up. Ernie in Arizona
 
At great risk of re igniting the old "What oil do you use" chestnut, what oil are you using? I also suspect the noise is from the main bearings being dry on startup. A thin oil will drain out quicker than a thicker one.
 
Try some 15/40 oil, or even 20/50. This will drain out slower and also give some cushion to worn bearings. If this makes a difference you will know that the bearings are loose and you can decide how you want to proceed from there. In my opinion 10w30 is kind of thin unless you have a fresh, tightly clearanced motor. :)
 
I cranked the engine over for 10 seconds or so and it started up with no noise. Bearings, piston slap or dry lifters?
 
Try publishing the noise. I am also going to guess it is piston slap from the description. The aluminum will expand to close up the gap after the engine starts to warm up.
 
I had a flash of inspiration on this. I've seen the dipper tray wells drilled so the oil can drain out of them. If that has been done to yours, the con rods would be running short of oil until they refill. If you are going to drop the sump (pan) to check bearing clearances, you might look into that as well. If they are drilled, a little weld, even some epoxy putty will do the trick - or replace it.
 
At less than 1000 miles since rebuild, I would definitely take this very seriously. Pull the oil pan or possibly the whole engine and go over it carefully. You will get lots of guesses here, but you need answers, and theres only one way that is going to happen.
 
KenBolton said:
After my pickup sets for several days the engine clatters on startup. Is has less than 1,000 miles on an overhaul. After running30-40 seconds it quotes down. Could this be lifters? If so why do they drain down to this point?
Click to expand...

Was the "overhaul" a complete rebuild? Or, what was done to the engine?
 
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