Included In Kit; Overview; Before Running Compression Test; Perform Compression Test - Mityvac MV5534 Instructions D'utilisation Et De Maintenance

Included in kit

• Analog diesel compression tester
comprising of test gauge with rubber boot,
15 in (375 mm) long, high pressure hose,
and 90° internal quick release
swivel coupler
• Custom molded case
• User manual (English, French,
Spanish and German)

Overview

Mityvac analog diesel compression tester is
designed for testing compression produced
in cylinders of diesel engines. It can measure
compression values up to 1 000 psi (69 bar).
Before running
compression test
• To achieve accurate results, engine should
be ran until it reaches normal operating
temperature, prior to testing. Complete
testing before engine cools.
• Ensure battery is fully charged to
provide power for adequate cranking
speed. Check engine manufacturer's
speciications to determine if minimum
cranking speed is required. It is
recommended that charger be connected,
or backup/auxiliary battery be used to
maintain required cranking speed.
Perform compression
test
Diesel engines utilize either direct or
indirect fuel injection systems. Direct
injection engines inject fuel directly into
cylinder, while indirect injection engines use
small pre-combustion chamber. Spark plugs
are not required for either type of diesel
engine. Instead, high compression achieved
in diesel engine cylinder heats air and ignites
fuel; however, cold diesel engines require
pre-heating of air in cylinder, pre-
combustion chamber or manifold, to start
engine. This is most often accomplished with
glow plug. Whether engine has a glow plug
and its location determines if glow plug
adapter or injector adapter is required for
compression testing. Best way to determine
type of adapter to use and appropriate test
method is to consult service manual. MityVac
offers a full line of glow plug and injector
style test adapters for most makes and
models of vehicles and heavy equipment.
3
Test with glow plug
adapter
Prior to starting compression test, consult
manufacturer's speciications and/or
appropriate service manual to determine
correct procedure for performing
compression test. Do not perform any
removal/installation of glow plugs without
knowing correct procedure and speciications
to perform operation. Follow below
procedures to complete removal/installation.
1 Put vehicle in neutral or park, and set
parking brake.
2 Run engine to normal operating
temperature.
3 Ensure battery has full charge and/or
connect charger or auxiliary battery.
4 Thoroughly clean area around each glow
plug to eliminate any chance of dirt or
contamination entering engine.
5 Remove glow plugs, label them by
cylinder number, and protect them
from damage.
6 Disable fuel supply system.
7 Select appropriate glow plug adapter
and install into cylinder 1.
8 Connect tester to glow plug adapter
installed in cylinder 1.
9 While watching gauge, crank engine and
count compression strokes by listening
adjacent cylinders. Watch for pressure to
peak around 6 to 10 strokes, then stop
cranking. Note number of strokes
required to reach peak compression.
10 Record cylinder number and peak
compression value.
11 Press pressure relief button on side of
tester to release pressure.
12 Disconnect gauge and remove
glow plug adapter.
13 Install glow plug adapter in cylinder 2,
and reconnect tester.
14 Repeat compression test on cylinder 2
and all remaining cylinders. Be sure to
crank engine same number or strokes
and to record peak compression value
for each cylinder.
15 After completing test on all cylinders,
remove tester and adapter, and replace
glow plugs.