Hello & Welcome! My Name is John Whelan, I've been a Heavy Duty
Mechanic for 32 yrs. and want to Share My Experiences with You.
Enjoy the Free Repair and Maintenance Tips on Diesel Engines
and other Medium Duty Truck Systems. Repairs shown are mostly on School
Buses but can be applied to all Medium Duty Vehicles.
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Submitted by schoolbusmechanic
May 21, 2010 Hits: 165 
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For the last month we had a student from Thompson Rivers University (just across the street from our location) complete a one month Practicum in our shop. His name was Dustin & he came in personally to ask if we would give him the chance to hang out with us...
DT Engine Design & The Wet Sleeve
International DT Engines have a wet sleeve meaning the cylinder wall is a seperate machined part that presses into the engine block. The sleeve is in contact with engine coolant which is why it comes by it's description "Wet Sleeve"
International runs the wet...
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Submitted by schoolbusmechanic
March 08, 2010 Hits: 596 0
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Cummins Diesel Engines have developed an after-treatment system that is very compact and easy to maintain. The only requirement is to have Diesel Exhaust Fluid available to add to the holding tank which is supplied by the Original Equipment Manufacturer.
Take a look at an over view of this system. Our...
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Submitted by schoolbusmechanic
February 18, 2010 Hits: 262 0
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We have an International Hybrid School Bus that is powered by a 6 Liter MaxxForce Diesel Engine. I just wanted to go through some of the components in this system that will increase fuel economy when applied under the right driving conditions.
The generator is inline with the driveline and...
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Submitted by schoolbusmechanic
October 23, 2009 Hits: 303 0
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The Wartsila-Sulzer RTA96-C turbocharged two-stroke diesel engine pictured has a thermal efficiency of 50% (the best in the world). There is new research going on in the University of Wisconsin, Madison that got 53% thermal efficiency out of a Cat Diesel Engine.
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I just read the article about...
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Submitted by schoolbusmechanic
October 20, 2009 Hits: 608 0
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Planetary Gear Systems have been around for awhile. A very common use for them are automatic transmissions. The gear ratios can be altered by changing which gear is driving and which gear is being driven. There is always one of these 3 gears that has to be fixed.This Delco 38...
We recently had one of our 6.5 Chevy Diesel engines fail on account of a loss of coolant caused by a faulty cylinder head. They crack and allow coolant into the combustion chamber.
There was a valve failure as well which you can see damaged the piston and slightly scored the...
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Submitted by schoolbusmechanic
September 02, 2009 Hits: 465 0
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Laser Beam Ignition is Coming!
Here's some interesting news for Mechanics and Car Owners / Enthusiasts.
It's amazing what the future is going to bring us in the form of more efficient engines. It tells me that totally functional electric cars are coming but not right away since this laser research is...
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Submitted by schoolbusmechanic
August 21, 2009 Hits: 323 0
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Planetary Gear Systems have been around for awhile. A very common use for them are automatic transmissions. The gear ratios can be altered by changing which gear is driving and which gear is being driven. There is always one of these 3 gears that has to be fixed.
This...
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Submitted by schoolbusmechanic
July 11, 2009 Hits: 2200 0
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This is Step 3 when tuning up a Cat 3116 Diesel Engine. The mechanical injectors are running off rocker arms so the spring height has to be adjusted at the proper engine position. The Cat Tool Kit has a calibration pedestal that the dial indicator has to be set to...
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