Back in 1977 a bearing roll would be necessary. With the advancements of oil in the last 30 years and the vast improvements in machining processes and materials, I got to agree and say bearing rolls are a thing of the past. I attended a Chevron presentation a number of years back and they compared 15w-40 CJ-4 designated oil with what was produced in the 70's and the CJ-4 is at least 5x better than what was produced in the 70's.
If your oil pressure is still within manufacturers specs, there is likely no excessive wear in the bottom end/camshaft. No sense shutting down and throwing money at something that ain't broken.
TIME OR NOT TIME TO OVERHAUL
Discussion in 'Kenworth Forum' started by lady doe, Jan 1, 2016.
Page 3 of 3
-
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
-
josh polk Thanks this.
-
OK bearing roll, I did at 800k. I posted the bearing on here some place. I have the pics here some where. The bearing from one rod where warn down t thru three layers.
I've had my exposure to motors, small like above and large CAT motors.
I rolled in the CAT bearing and gave me more miles, 200k .
OP,
Keep an eye on your motor, if it acts up fix it. As long as you maintain your truck it will last you a while.
Use this site to make a educated judgement on how your to proceed. @rollin coal and @NorthernMechanic as well as myself can give an opinion. It your money your call in the end. -
Do oil samples that will tell alot. Smoke out of the blowby tube is normal on the msx a-certs. It is not because of more air. It is from the oil mist caused from the actuators working the oil from the oil they spray out the actuator exhaust ports. I would recommend doing an overhead to keep valve and injectors in adjustment. And check the hold down bolts while they are in there.
-
Granted this is an N14, with over a million.
Oil samples showed increased/increasing copper and lead. I picked up a couple of pounds oil pressure, and then followed it up with a new oil pump to be sure.
I've no experience with CAT, only heard the opinion that bearing rolls weren't necessary - as @NorthernMechanic put, older school thinking, perhaps from mechanical engine days with more fuel dilution/older oil technology.
I was goaded by a couple of older drivers into doing it, the samples backed it up - who knows - the old girl may throw the toys out of the cot in another 100k miles and it have been a general waste of time.
Just my 1.5 cents (rates are down)Last edited: Jan 17, 2016
peterbilt_2005 and Cat sdp Thank this. -
You did the right thing with your N14 Blair. Fretting is a known issue with that motor. Back when you mentioned you were going to have it done I thought it was unnecessary until I did more reading. My rods and mains with almost 1 million miles didn't look anything like yours in fact most of them had not worn thru that first layer.
joey8686, lady doe and blairandgretchen Thank this. -
blairandgretchen Thanks this.
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
Page 3 of 3