mimsriggers

Hi all! I have a 07 mack AC350. I'm getting a terrible screeching sound from somewhere around the turbo. After trying it while sitting I found it started at around 1200 or 1400 rpm. I then watched the waste gate and found that the noise did seem to be affected by the position of the wastegate linkage. I then put a small pry bar between the limit adjust screw or what appears to be such, and the noise disappeared. I'm wondering if 1. that's in fact what these screws are and 2. what it sounds like my problem could be. It seems like I could move the limit screw some and the noise would go away, however if that's the case am I making it so I wont get full boost? Perhaps the waste gate valve is bad? any help would be greatly appreciated. Thanks

Hi all I've recently purchased a 2000 Mack Vision with a 460 mack engine. The truck has about 600K miles on it. So far I've only taken the truck on a couple of short runs. I've thoroughly enjoyed it's comfort. This unit has a winch and wet line. When using the wet line I used the cruise control to up the idle. I've done this on my freightliner with no problems. The problem arose when I was using the wet line for approximately 15 minutes. I was outside the truck and all of a sudden it started making a noise that sounded like the starter engaging and then the truck shutdown. After opening the hood I found that the starter was hot and smoking. I decided to let the starter and truck cool down and see if it would fire up. No such luck. The truck had low voltage. I charged the batteries and tried again to no avail. When trying to crank it again it didn't turn so well and I assumed that the starter was cooked. Then I left the truck sitting and went about doing something else. Out of nowhere the truck started cranking again. fortunately, I had gloves on and a wrench so that I was able to remove the neg wire to the starter quickly. I got the truck back to the shop and removed the 39MT delco starter. I was told by the auto electrical shop that these starters were hard to get parts for. Consequently I ordered a new OEM starter for it. I also inspected the drive on the old one as well as the trucks flywheel. Fortunately there was no visual damage. My question is this. Does and one have any ideas on what may have caused the spooky starter engagement? Do the 39MT's commonly have a fault that can make them have a mind of their own? Thanks for the help