Detroit Diesel — Air Induction System Pressure Test
Testing & diagnosis
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- An air induction leak on the suction side can cause an engine failure and must not be tolerated.
Procedure
- Mask off the outer diameter of air cleaner element air inlet with duct tape and plug air cleaner canister drain.
- Remove the air cleaner restriction indicator or tubing and install a plug to seal opening.
- Locate tap on cold air discharge pipe and connect a manually regulated air supply with pressure gauge.
- Apply 5-8 Ib/in.2 of air pressure with regulator to pressurize the air induction system.
- Coat areas with soap solution and check for leaks (bubbles).
- No leakage is permitted between air cleaner and turbocharger (suction side); tighten clamps or replace parts and retest.
Tools required
- 0-15 Ib/in.2 (0-103 kPa) pressure test gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 5-8 Ib/in.2
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.