Mack Technician

You have active codes? Amber warning light on?

T300 series got to be quite a bit better than the T200 through development........but anyone who has rebuilt Fuller immediately recognizes Mack stole the T300 slider-clutch design from Fuller. No crime, it’s a better design.

Does it tend to want to hang around 900 RPM?

Follow you air governor line back to the tank its sensing pressure from. That's your wet tank. Wet tank gives air to both sides of your trucks air system and never takes any back. Wet tank has no monitoring, so temporarily screw a gauge in an open port on the wet tank so you can see what's happening there. Wet tank is isolated and is a relatively small cavity, 1/2 a tank in size, usually a split tank at low position. The governor only senses your wet tank since it's the supply to trucks air system, governor can't tell you what the rest of the system pressure is, it's only function is to make sure the wet tank is always full so rest of system can be fed off the wet tank. 

Scenario....

1. Governor properly/accurately senses the wet tank....which (tank) is going low on air constantly - so fix origin of the wet tank leak. Your dash can't see what's going on at the wet tank either, so put a gauge in it.

2. Governor has lost its mind and is failing (AKA- Gavin Newsom syndrome). It's new, but that doesn't mean it's good. It was a topic the other day on here and I also had a new one that was bad out of the box last fall.... right from Mack dealership.

3. Any line leading to and away from the governor could be leaking off the signal governor is trying to send.

For example: Governor can't send a large volume of air to a leaking spitter valve to unload it, or a leaking sensing line, or a leaking unloader in compressor head (which yours is new, so don't worry), governor can't compensate for the leak by sending more air fast enough and then you get a "drop out"..... a repetitive cycle of loading and unloading. Get soapy water and check while running...every sensing/control line.

Note: I also only got one year out of my AD9 split valve and it blew out a seal causing wet tank leak down out the bottom of the dryer. crumby parts.

Handful of meaty CV713's came rolling past me today. Tooled for 98K. He shared some coal leaving the weigh-in....... Makes you wonder?  

 I wanted to visit Maine, now I'm debating if I need to move there?

Can't quite make it out, but it looks like she's holding cold beer?

Sounds cool...……..but no pic showed up?

A bear is nothing but an overstuffed raccoon. They can’t leave anything alone.

I was out elk hunting and came upon a cattle rancher who had his travel trailer demolished by black bear. I looked it over with him. Bear bit every water bottle once and punctured them. Open his tackle box and spread the baits everywhere. Tore a hole right through the aluminum side wall and squeezed in, spread a bag of flour all throughout the thing and tore the place to shreds. You could see he was “puppy chewing” everything for curiosity. 

No programming, just put it in. 

Get an 18 speed knob and your trans will become an 18 speed. The 13 just has a block pin in it to stop you from splitting low. Sales pitch...kinda lame they did that. 

The lines have push-pull sleeves. In other words if you push the ring in and pull line it will pop out. You must not have any air pressure or the line won’t want to release. They are like the shark bite pex fittings. 

On 5/29/2019 at 5:40 PM, JoeH said:

I had a tractor that did this, it blew the line that runs from compressor to the governor. I've had new governor's bad out of the box. Don't rule it out.

Had a bad air governor right out of the box last fall. Makes you second guess yourself.

In freezing weather you do well to have an air dryer protected system. The other thing you need to consider is low pressure freezing. In other words compressed air moving from high pressure to low pressure creates ice. An example is the ice which forms on a carb Venturi on a hot engine. Just because you are in a warm climate doesn’t mean you can’t have ice form spontaneously in your brake system and cause trouble temporarily till it thaws. Rapid brake pumping could bring on a freeze inside an R valve plunger. The drier the air the better.

On one hand you can argue it never had one. On the other hand they made a policy for installing them for good reason. 

Buy all the government surplus flak jackets from the Vietnam era. Put cool GM emblems all over them. Have a famous, beautiful, model walk down the catwalk wearing one. Popularize the fashion and send them to Takata customers with a pair of designer safety glasses called “GM performance driving glasses”. That way tax payers won’t have to bail them out again and pay for someone else’s air bag recall. 

43 minutes ago, Bullheaded said:

Rob....when did that E7 have the air compressor issues? My 2000 CH  E7 460 I used to have was one of the ones that came from the factory with casting sand not properly cleaned out of it.

I got towed home almost every trip for the first week until they got it all flushed out. It would plug that small cooling line to the air compressor, then it would over heat.

I fried 5 air dryers and compressors before it finally got flushed out.

 

Then other than dropping a valve and having that mass ground issue that always had the lightning bolt coming on, it was otherwise a great truck and engine.

The air compressor problem started in tandem with Volvo getting rid of Mack’s Renault engine coolant SCA filter. They didn’t think there would be a payback on the removal of it. They soon found out they were not getting the engines properly cleaned and without the coolant filter to cover for them the free agent casting sand would settle in low areas of the sleeve gallery, plugging the air compressor feed. The solution was an elbow fitting with a stand pipe which allowed the sand to settle in, but not cover the ports feed. If you have a 90 degree stand pipe fitting in the motor, and you’ve done your best to flush, you shouldn’t keep burning up compressors.

If you have a coolant filter your golden. 

Last two winters we’ve had Volvo front loaders that have lost heat in the cab. Both times it was casting sand plugging the heater core. Kinda like cups, they don't figure it out...even two decades later. 

Right back atcha. 

You have no dead holes.....power is good....pyro is high......engine makes a “pich” “pich” “pich” as if it’s a single cylinder and not a constant hiss of steadily escaping boost.... 

The intake has a small square pipe plug with, I believe, 1/8” NPT threads. Run a 1/4” airline compression fitting in and run it into cab window so you can check boost under load. 

let it cool and spray soap water on the exhaust manifold legs to head. Run it and apply more.

Did you extract the active code blink? 

CMCAC-chassis mounted charge air cooler.

Why weren't you able to follow through on upgrading injectors? "Snag"?

Sounds like you already solved it. Add another two scoops of determination in finding the leak. You got a pressure tester for CMCAC?

WOW! Things beautiful...…. I wanna hug it and then drink a cup of it's motor oil.

Fascinating, almost backwards. You’d assume that would be the last iron horse on earth to convert. 

REMACK BUYER BEWARE.....( OR AWARE)

Heard a blood curdler this morning. Remack may be suffering from GEA(gray engine amnesia) too?   

Guy goes to a shop in Southern Wi (unconfirmed if it was Mack Dealership), truck is in need of tuning. Its an E-Tech (Pre-CCRS/ASET). Shop sets him up with a new set of remack injectors and some touching up. Truck runs just as bad or worse. Power is poor. Driver checks, fuel consumption is up. EGT's are consistently high. Customer begins a circle pattern of returning to the shop with complaints and failures for nearly 2 years. Over the course of the two years the truck consumes 4 turbos, 2 manifolds and finally cracks a head. Customer takes truck north 2 hours to the Mack dealership and suspect injectors go to the injection shop. Injection shop service man disassembles the injectors and finds the right tip in the wrong injector body. Remack put the right E-Tech tips into the wrong CCRS injector body's and bagged it. The CCRS injector body doesn't have a leakage hole or lower o-ring. The parts man gave the mechanic the right bag and the mechanic unfortunately didn't catch the different injector body configuration.

Mack predicts(page 2 caution) a mismatch would have ruptured the seal at the fuel line connection to injector...…...

SB.pdf