Job Info
🔥 Running
2. Pre-Service
3. Lube
4. Cooling
5. Fuel
6. Ignition
7. Intake/Exh
8. Electrical
9. Mechanical
10. Governor
11. Post-Svc
12. Parts
13. Follow-Up
14. Sign-Off
Complete all fields before proceeding to inspections.
Client & Site
Engine Information
Complete with engine running and at operating temperature — BEFORE shutdown. This is your baseline.
Engine Condition — Running
Exhaust smoke or abnormal color?
Abnormal sounds (knock, tick, rattle, detonation)?
Lubrication — Running Readings
Oil pressure at idle (psi)
Oil pressure at rated RPM (psi)
Cooling System — Running Readings
Coolant temperature at operating (°F)
Freeze point protection (°F)
Fuel System — Running Readings
Supply gas pressure (psi / " WC)
Regulated gas pressure (psi / " WC)
Ignition — Running Readings
Governor & Speed — Running Readings
Speed stability — no hunting or surging?
Battery & Charging — Running Readings
Charging voltage at rated RPM (V)
Document equipment condition before any work begins. This establishes baseline and protects both TSI and the client.
Engine Condition at Arrival
Fluid Condition
Oil condition (color, smell, debris)
Coolant condition (color, contamination)
External Visual Inspection
Engine mounts / vibration isolators
Exhaust manifold / flex joints
Wiring harness condition
Hose condition (cracks, swelling, leaks)
Belt condition & tension
Air intake piping / clamps
Crankcase breather / ventilation
General cleanliness / debris around engine
Oil is the lifeblood of the engine. Inspect all lube system components thoroughly.
Oil Added / Changed
Oil drained / changed? *
Oil filter(s) replaced? *
Oil Condition
Oil sample taken for analysis?
Filters & Components
Oil filter — debris or metal in old filter?
Oil cooler — leaks or restriction?
Oil pan — leaks, drain plug torqued?
Crankcase breather / PCV system
Oil lines & fittings — leaks?
Natural gas engines run hotter than diesel. Cooling system failures are the #1 cause of premature liner pitting.
Cooling Components
Coolant filter replaced?
Thermostat — opens at correct temp?
Water pump — leaks, bearing play?
Radiator / heat exchanger — fins, leaks, airflow
Fan & fan drive — blades, hub, bearing
Coolant hoses — condition, clamps tight?
Pressure cap — holds rated pressure?
Coolant heater (block heater) — functional?
Natural gas fuel train — regulators, shutoffs, mixer/carburetor, and gas quality.
Gas Pressure Readings
Supply gas pressure (psi / " WC)
Regulated gas pressure (psi / " WC)
Fuel Train Components
Manual gas shutoff valve — operates freely?
Solenoid shutoff valve — opens/closes correctly?
Gas regulator — stable output, no creep?
Gas filter / scrubber — clean, no moisture?
Carburetor / mixer — diaphragm, adjustment?
Fuel lines — leaks, connections tight?
Gas leak check performed (soap/detector)?
Ignition is critical on natural gas — detonation from poor timing or weak spark destroys pistons.
Spark Plugs
Spark plugs inspected / replaced?
Spark plug gap checked & set to spec?
Plug condition — electrode wear, fouling?
Ignition Components
Ignition wires / leads — condition, resistance?
Magneto / coil packs — output, cracks?
Ignition module / ECM — faults or codes?
Pickup / crank sensor — signal clean?
Air quality and exhaust flow directly affect combustion efficiency and emissions.
Intake System
Air filter element — replaced?
Air filter restriction indicator
Air cleaner housing — sealed, no bypass?
Intake piping & clamps — tight, no leaks?
Turbocharger — shaft play, oil leaks?
Aftercooler / intercooler — leaks, restriction?
Intake manifold — gaskets, cracks, leaks?
Exhaust System
Exhaust manifold — cracks, leaks, bolts?
Flex joints / expansion bellows
Muffler / silencer — condition
Catalytic converter — condition
Batteries, charging, wiring, sensors, and safety shutdown verification.
Battery & Starting
Battery terminals — clean, tight?
Battery cables — condition?
Starter motor — cranks strongly?
Alternator — belt, output, mounting?
Sensors & Gauges
Oil pressure sensor/gauge — reads accurately?
Coolant temp sensor/gauge — reads accurately?
Hour meter — functional?
Tachometer — reads correctly?
Wiring harness — chafing, heat damage, rodents?
Safety Shutdowns — TEST EACH ONE
High coolant temperature shutdown
Low oil pressure shutdown
Overspeed shutdown
Overcrank shutdown
Emergency stop (E-stop) — functions?
Gas leak detector / LEL shutdown
Valve lash, compression, and mechanical integrity checks.
Valve Lash (record all cylinders)
Cylinder
Intake (")
Exhaust (")
Status
Compression Test
Cylinder
Reading (psi)
Status
Mechanical Inspection
Harmonic damper — rubber condition, bolt torque?
Flywheel — ring gear teeth, bolt torque?
Engine mounts — cracked, compressed?
Drive belts — tension, condition, alignment?
Valve cover gaskets — leaks?
Front/rear crank seals — leaks?
Speed stability under load is critical for generator and compressor applications.
Governor Components
Governor type (mech / electronic / actuator)
Governor oil level (if mechanical)
Throttle linkage — free movement, no binding?
Load acceptance — smooth transition?
Final running checks after all service work is complete. Do not leave site until this section is done.
Startup & Stabilization
Engine starts and runs smoothly?
No abnormal sounds after service?
No new fluid leaks after service?
Operating Parameters at Stabilization
Boost pressure (psi) — if turbo
Post-Service Oil Verification
Oil level checked after fill — at correct mark? *
Drain plug torqued — no leak after startup? *
Oil filter seating checked — no seep? *
Final oil pressure reading (psi)
Final Checks
All guards and covers reinstalled?
Work area cleaned up?
Client notified of completion?
Tools accounted for (nothing left in engine)?
Record every part, filter, fluid, and consumable installed or replaced.
Description
Part Number
Qty
Fluids
Flag anything that needs attention before next service. This section drives repeat business.
Items Requiring Future Attention
Next Service
The following items are required before generating a customer report. Tap any item to jump to it.
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