Wednesday, March 5, 2014
How to Test for an Exhaust Leak at the Manifold
Exhaust manifold leaks are obvious, especially when first starting the engine. As the engine warms, the metal of the manifold and engine block expand and quiet the leak. Manifold leaks can vary in sound from a loud exhaust leak to a subtle ticking sound -- often misdiagnosed as a faulty lifter in the valves. In some cases, testing the manifold can require lifting the vehicle. Manifold to block connections can be tested from the engine compartment or under the vehicle. The use of a stethoscope will undeniably pinpoint a leak and its location.
Instructions
- 1
Park the vehicle on a flat surface and apply the parking brake. Open the hood (even if the vehicle is being lifted to test the manifold, the open hood will offer more lighting to see better underneath the vehicle). If there is no need to lift the vehicle to test the manifold to block connection, proceed to Step 4.
2Place a wheel chock against the outer tread of one of the rear tires for extra protection (if lifting the vehicle).
3Hoist the front of the vehicle up with a jack and place it onto jack stands (one side at a time).
4Put on the safety glasses and gloves and then start the engine.
5Put the stethoscope on (and crawl under the hoisted vehicle, if applicable) and run the tip of the stethoscope along the manifold to engine block connection. Be aware of moving engine parts and loose fitting clothes; especially if testing from the engine compartment area. Also be aware that it will not take long for the front exhaust system to get extremely hot. Be sure arms and hands are well covered and protected.
6Check the manifold to engine block connection thoroughly. The moment the tip of the stethoscope gets near a leak, the sound will intensify greatly. Check for leaks in other locations along the manifold to block connection and even check the front exhaust pipe to manifold connection.
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