Wednesday Mar 10

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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Cummins Diesel Engines 2011 Emissions Overview
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...
 
 
Hybrid International School Bus
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...
 
 
Diesel & Gasoline Working Together?
  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.   I just read the article about...
 
 
Delco 38MT Starter Planetary Gear System
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...
 
 
6.5 Diesel Failure Analysis
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...
 
 
Laser Ignition Systems Being Developed By Ford Motor Co.
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...
 
 
Servicing a Delco 38MT Starter With Built In Planetary System
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...
 
 
Cat 3116 Injector Fuel Timing & Valve Set
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...
 
 
CAT 3116  Injector Synchronization
This is Step 2 after you have installed and seated the Cat 3116 Injector. All six injectors are connected to a rack that is hooked to the governor which senses operator throttle and engine loads to determine how much fuel and rack travel to allow. The governor has a fuel...
 
 
Cat 3116 Diesel Engine-How To Install MUI Injectors
Before installing MUI {mechanical unit injector}injectors on a 3116 diesel engine the first thing to check is the brass sleeve in the cylinder head. It has the job of providing a seating surface for the injector, so any visible wear will require you to get the sleeves machined or replaced. Here...
 
 
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