Bully Dog 40390 PCH with Pyrometer Lead - Manual (Page 8)

7
installation Step 1
STEp 1: INSTALLINg THE pyROMETER pROBE
In this section you will drill and tap the pyrometer
probe in the exhaust, either pre-turbo or post-turbo
as a means to collect exhaust gas temperatures
(EGT). Exhaust gas temperatures indicate how hot the engine is getting and can be used to set
safety defueling parameters for diesel vehicles.
pRE-TURBO MOUNTINg:
1. Drill a 5 /
16
” hole into the exhaust manifold where all the exhaust runners of the manifold come to-
gether, 3” in front of the turbo charger exhaust inlet. Try to be with in plus or minus 1” of the 3” target.
Then tap the hole with a
1 /
8
” pipe tap and mount the pyrometer probe in the hole. Use a 9 /
16
” wrench
to tighten the probe holder or tube fitting to the exhaust manifold. Then tighten the pyro probe Cap to
the holder using a
5 /
8
” wrench.
2. Run the pyro cable up to engine bay; let the end of the cable sit while installing the PCH Board.
wARNINg: If any debris such as drill bits and metal shavings drop inside the exhaust manifold, it is
strongly advised that the manifold be removed from the vehicle so that the debris can be removed
before starting the vehicle again. Such debri can cause damage to a turbo charger.
TOOL TIp, pRE-TURBO MOUNT
When drilling into the exhaust manifold, metal spews, shavings, and broken drill bits can fall inside. Try
following these steps to prevent debris from falling into the manifold: 1. Use a high quality twist bit and
a slow speed drill, about 500-800 rpm. 2. Start with a small pilot bit about
1 /
8
”, then use the full 5 /
16
” bit
after the smaller one has punched through. 3. Grease your drill bit in addition to the normal lubricant, this
will catch flying spews as they are cut. 4. Just prior to punching through into the inside of the manifold,
start the engine and build up exhaust pressure on the inside of the manifold (blows spews outside the
manifold instead of letting them fall inside). 5. Also magnetize the drill bit so any excess shavings will be
magnetically drawn to the drill bit.
3”
Exhaust Manifold