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Hello, my question is about air in engine cooling systems. Coolant is formulated to resist boiling, and furthermore kept under pressure to increase its boiling point. I think this is to control its phase. In other words we must prevent coolant from boiling (vaporizing) because vapor does not...

Pat - Most automatic transmissions use a planetary gearset where the gears are on shafts without any bearings at all, there are some thrust shims in some cases and thrust bearings throughout the transmission but the thrust loads are essentially locked down at the carrier and are not transmitted...

Greg - do you know if there is a comparable effect with CV axle angles? Also, if the drivetrain is subjected to the high amplitude high frequency torque variations you describe I would expect it to take a heavy toll on the clutches of the transmission and the lockup clutch of the converter...

>I'm fairly certain the "driveline" referred to in the manual begins at the transmission output shaft. IE, the drive shaft angles. >Jack, whilst I agree one would think the universal joints or CVs would accomodate any movement. CV inner joints (tripod style) can operate at angles up to 25...

Hello, I stumbled across this odd note from GM's engineers in their service manual: "Notice: Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses."...

I also call BS. I see a variety of recommendations from manufacturers and OEMs that would lead to the premature failure of their products as well. I went to research coil spring failure today and found this article from the british Automobile Association Coil Spring Failure Season Their...

The rigol scope you linked to looks fantastic. I have to look into it more. >Many of those parameters (especially the pressures) would be measured with a gauge or a meter (on >the appropriate sensor). Others (e.g. throttle position) can be read from the OBD-II port. Yes there are many...

Hi, I am trying to find a good entry-level oscilloscope to use with automotive applications. I was wondering if the Pico 2205 would be adequate for me. specs: http://www.picotech.com/picoscope2200-specifications.html I want to scope transducers for shaft speeds and pressure changes, like...

Hello, I am not an engineer, I am a service technician in the automotive field with some formal education. Before asking a question here I typically spend hours on a day to day basis researching it and trying to find the answers myself. Today's question concerns air that has become trapped in...

I believe Mr. Petersen's description is correct. I recently had a detroit locker apart and I took some photos of the mechanisms and tested its operation when it was installed. The only thing I didn't understand was that once the overspeed wheel unlocks it freespins until it falls down to the...

Hi, I'm a mechanic learning about setting up differentials of the typical/basic type; open differentials with ring and pinion gear. Nothing fancy. I am not sure I understand why there are pinion depth shims on the pinion shaft between the cone bearing and the pinion gear. But because there is...