Combustion Gases In Coolant - Detroit Diesel EPA07 Series 60 DDEC VI Troubleshooting Manual

13.9 COMBUSTION GASES IN COOLANT

To determine if combustion gases in coolant is causing high engine coolant temperature, perform
the cylinder compression test. Refer to section 13.9.1.
13.9.1 Cylinder Compression Test
Perform the following steps for a compression test on a Series 60 Engine:
To avoid injury from inhaling engine exhaust, always
operate the engine in a well-ventilated area.
exhaust is toxic.
1. Start and run the engine until normal operating temperature is reached. Stop the engine.
2. Disconnect the batteries.
3. Disconnect the fuel pump feed line from the fuel tank. Place a suitable container under
the line to catch the spilling fuel. Turn the ¼ turn valve off on the outlet fitting of the
secondary fuel filter.
4. Disconnect the fuel supply line to the cylinder head. Place a suitable container under the
line to catch the spilled fuel. Disconnect the fuel return line from the doser valve and place
a suitable container under the line to catch the spilled fuel.
To avoid injury from flying debris when using compressed
air, wear adequate eye protection (face shield or safety
goggles) and do not exceed 276 kPa (40 psi) air pressure.
All the fuel must be removed from the cylinder head before
removing injectors. This prevents the fuel from entering the
cylinder and causing cylinder wall lube oil wash down or a
hydrostatic lock at startup.
5. Blow low pressure regulated air no more than 207 kPa (30 psi ) into the inlet fitting for 20
to 30 seconds or until all the fuel is purged from the head.
6. Clean and remove the rocker cover, it is not necessary to remove the bottom rocker cover.
If equipped with Jake Brakes remove the Jake Brake assembly.
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION
SERIES 60 DDEC VI TROUBLESHOOTING GUIDE
ENGINE EXHAUST
EYE INJURY
NOTICE:
Engine
13-13