Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #25 – January 13, 2019, 05:34:53 pm Quote from: Chuck Pearson – January 13, 2019, 05:20:31 pmDo your turbo vanes show any erosion, dusting will generally show up there. X2....I've blown a couple of turbos, and the OP describes EXACTLY what happens when a turbo goes bad: white smoke, heavy oil use. Now, he's saying the smoke is from the breather, is the exhaust pipe clean? Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #26 – January 13, 2019, 05:39:56 pm Switched to Donaldson blue. Finer filtering. Not affected by water as far as I know Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #27 – January 13, 2019, 06:16:27 pm Quote from: Chuck Pearson – January 13, 2019, 05:20:31 pmDo your turbo vanes show any erosion, dusting will generally show up there.I haven't specifically checked the turbo vanes. I did pull the intake hose from the turbo and it appeared clean inside with no apparent issues. It would seem that the kind of erosion that you're suggesting would come from a fairly long exposure to constant dusting. I "think" mine was a pretty limited event. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #28 – January 13, 2019, 06:25:52 pm Quote from: mike leary – January 13, 2019, 05:34:53 pmX2....I've blown a couple of turbos, and the OP describes EXACTLY what happens when a turbo goes bad: white smoke, heavy oil use. Now, he's saying the smoke is from the breather, is the exhaust pipe clean?Actually, I don't think I ever said I'm getting smoke from anywhere other than the breather tube. The exhaust pipe does have dry, black soot but no more than normal. And no smoke of any kind or color from the tail pipe, except maybe a blast of black smoke at startup. I wouldn't necessarily categorize the oil consumption as heavy. Others have mentioned as much as a quart every 100 miles. I'm losing maybe a gallon or more over 6k miles. I've now calibrated my dipstick and I'll be watching that much closer over the next several thousand miles. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #29 – January 13, 2019, 06:40:33 pm Thanks for the reminder on the air filter. Hope your damage is minimal. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #30 – January 13, 2019, 06:45:48 pm Quote from: bdale – January 13, 2019, 06:25:52 pmActually, I don't think I ever said I'm getting smoke from anywhere other than the breather tube. The exhaust pipe does have dry, black soot but no more than normal. And no smoke of any kind or color from the tail pipe, except maybe a blast of black smoke at startup. I wouldn't necessarily categorize the oil consumption as heavy. Others have mentioned as much as a quart every 100 miles. I'm losing maybe a gallon or more over 6k miles. I've now calibrated my dipstick and I'll be watching that much closer over the next several thousand miles.O.K., if you have a turbo seal gone bad, you WILL go through oil, big time. You will have a blue/grey smoke from the exhaust, and at higher elevations, LOTS of white smoke! Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #31 – January 13, 2019, 07:45:11 pm Quote from: bdale – January 13, 2019, 06:25:52 pmActually, I don't think I ever said I'm getting smoke from anywhere other than the breather tube. The exhaust pipe does have dry, black soot but no more than normal. And no smoke of any kind or color from the tail pipe, except maybe a blast of black smoke at startup. I wouldn't necessarily categorize the oil consumption as heavy. Others have mentioned as much as a quart every 100 miles. I'm losing maybe a gallon or more over 6k miles. I've now calibrated my dipstick and I'll be watching that much closer over the next several thousand miles.You can get a crankcase water manometer tool that will measure the amount of blow-by. A gallon every 6000 miles is less than a quart per thousand. Some have had success with a decarbonizer or flushing oil concentrate. Do a Google search for above.diesel blowby tester cat - Penelusuran GooglePierce Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #32 – January 13, 2019, 08:15:55 pm A quart per thousand miles is normal oil consumption in a diesel engine. Not excessive. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #33 – January 13, 2019, 08:52:49 pm 8v92 used a gallon per thousand miles. Birds had a metered oil filler in the engine compartment.My Lexus ls460 says above a quart in 600 miles to contact service.Same car using 0-20 used a quart in 7,000 miles Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil - RESOLVED Reply #34 – April 07, 2021, 12:38:56 am Updating to close this thread out for anyone that might have been following my engine issues..... My Cat 3126 engine continued to get worse over time, burning 14 gallons of oil on my recent 2500 mile round trip to Q. See previous posts for the history but it was time for it to go. Last week Holt Cat in Longview Tx completed the installation of a rebuilt motor, and I re-lined the engine bay this week with 2 layers of Noico 80mil sound deadener and 1 layer of EZ-Cool insulation. Very happy so far with both, although I'm having an issue with a low rpm idle that shakes the coach pretty badly until throttle is applied. They increased the idle from 700 rpm to 750, which helped but did not fully resolve the issue. I think it needs to go to 800 but they want me to run it this way for a while to see if it gets better on its own. So I'll give it 1k miles or so and see what happens. So far I'm noticing that I don't lose speed or change gears as often on inclines but I'm not seeing any difference in MPG yet. I'm hoping that might happen as it gets broken in. But, I'm not burning or leaking oil so mission accomplished. Quote Selected 6 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #35 – April 07, 2021, 08:31:11 am Engine bay lining looks great! Well done. As I'm sure you know, if the idle speed is set too high, the Allison will refuse to shift out of neutral (N).Did they install fresh new motor mounts with the rebuilt engine? In one photo I think I'm seeing red urethane motor mounts. If so, these can sometimes be less flexible than standard rubber mounts, resulting in more engine vibration transmitted to the chassis. At least that's the way it worked on my old hot rods. Quote Selected 1 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #36 – April 07, 2021, 09:24:49 am Good spot on the motor mounts,agree with above,rubber is better. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #37 – April 07, 2021, 09:54:06 am Yes, all new motor mounts. And they may need to be changed if raising the RPM's doesn't resolve it. I'm pretty sure I used to idle at 800 though. Increasing the throttle pedal to 800 (measured on my BlueFire tach) does seem to be just enough to smooth it out and I've confirmed that the transmission will go into gear at 800. So, I'm thinking that will be the solution. Quote Selected 1 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #38 – April 07, 2021, 10:09:55 am Bdale, what is that box structure on the left side of the bay? Great job on the insulation.jor Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #39 – April 07, 2021, 10:17:05 am That's the safe. The door is on the driver side of the bed pedestal. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #40 – April 07, 2021, 10:31:23 am bdale,Talk to your shop to see if they rebuilt the injectors and/or injection pump. Unless the pump is putting out the same pressure, amount and at the right time for each cylinder, the idle will be rough. I used to send all the MBZ pumps to the shop to be re calibrated (and add fuel). An hour on the bench should do the trick.Pierce Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #41 – April 07, 2021, 10:37:11 am Quote from: bdale – April 07, 2021, 10:17:05 amThat's the safe. The door is on the driver side of the bed pedestal.You probably would NOT want to hide a secret stash of Hershey Milk Chocolate Bars in that safe.OTOH, would be a great place to warm up some burritos for a quick lunch on the road! Quote Selected 1 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #42 – April 07, 2021, 01:57:38 pm Quote from: Pierce & Gaylie Stewart – April 07, 2021, 10:31:23 ambdale,Talk to your shop to see if they rebuilt the injectors and/or injection pump. Unless the pump is putting out the same pressure, amount and at the right time for each cylinder, the idle will be rough. I used to send all the MBZ pumps to the shop to be re calibrated (and add fuel). An hour on the bench should do the trick.PierceThey did install new injectors and a new (rebuilt) HEUI pump. I assume they calibrated it all properly. It's not really running noticeably rough though. Standing outside the coach you'd never know there was an issue. It's just that at the lower RPMs there's a lot of vibration being transferred throughout the coach. The cabinets rattle and you can feel the vibration all the way to the drivers seat. It's like it's hitting a harmonic resonance frequency or something. It all disappears completely when it passes 800 rpm and never comes back at any driving speed. Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #43 – April 07, 2021, 02:13:44 pm The engine mount bolts may be over or under torqued . Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #44 – April 07, 2021, 08:51:54 pm We are brothers from different mothers..........Want to race?Chris Quote Selected 1 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #45 – April 07, 2021, 09:22:30 pm Let's do it! I'm leaving for Biloxi Ms on Saturday. 1st one there wins. Quote Selected 1 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #46 – April 08, 2021, 09:38:03 am Quote from: bdale – April 07, 2021, 01:57:38 pm It's just that at the lower RPMs there's a lot of vibration being transferred throughout the coach. The cabinets rattle and you can feel the vibration all the way to the drivers seat.So, you've gone from a tired engine to a brand new engine.From tired engine mounts to brand new, and trust me you'll never match the mounts that came from the factory.Fun fact, once upon a time engines were bolted directly to the frame. W.O. Bentley tried to hide the rubber engine mounts from a sense of shame on the Cricklewood Bentleys. Quote Selected 1 Likes
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #47 – April 08, 2021, 10:06:37 am The original mounts also had a lifetime of use and if had not failed were as soft as they possibly could be. The manufacturer go to great lengths to match up correct mounts to provide long quiet service. Can be difficult to duplicate. Scott Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #48 – April 08, 2021, 11:28:46 am Quote from: dsd – April 08, 2021, 10:06:37 amThe original mounts also had a lifetime of use and if had not failed were as soft as they possibly could be. The manufacturers go to great lengths to match up correct mounts to provide long quiet service. Can be difficult to duplicate. ScottWhen I re-built the engine in my 1950 Chrysler, I was happy to be able to buy re-production engine mounts even with the disclaimer that I "might feel more vibration." Quote Selected
Re: Caterpillar 3126 Venting White Smoke, Consuming Oil Reply #49 – May 13, 2021, 12:34:47 am Quote from: bdale – April 07, 2021, 12:38:56 amUpdating to close this thread out for anyone that might have been following my engine issues..... My Cat 3126 engine continued to get worse over time, burning 14 gallons of oil on my recent 2500 mile round trip to Q. See previous posts for the history but it was time for it to go. Last week Holt Cat in Longview Tx completed the installation of a rebuilt motor, and I re-lined the engine bay this week with 2 layers of Noico 80mil sound deadener and 1 layer of EZ-Cool insulation. Very happy so far with both, although I'm having an issue with a low rpm idle that shakes the coach pretty badly until throttle is applied. They increased the idle from 700 rpm to 750, which helped but did not fully resolve the issue. I think it needs to go to 800 but they want me to run it this way for a while to see if it gets better on its own. So I'll give it 1k miles or so and see what happens. So far I'm noticing that I don't lose speed or change gears as often on inclines but I'm not seeing any difference in MPG yet. I'm hoping that might happen as it gets broken in. But, I'm not burning or leaking oil so mission accomplished.Vibration issue solved. One of the engine mounts was installed incorrectly. It was not properly centered and seated in it's hole when they bolted it down, which pinched the mount to the point where the metal on each side of the mount was rubbing at lower RPMs. As the RPMs rose, the torque rotated the engine enough to separate the metal-on-metal contact. Turned out to be a very easy fix that cost a lot of time and frustration. Happy to have it all worked out now. Quote Selected 3 Likes
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