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Other Leak Detection Applications (Cont.)
Oil Seals and Gasket Leaks
Many oil leaks can be located with the MotorVac Cool Smoke. It is important to understand that the
MotorVac Cool Smoke will only find leaks that will allow air to flow through them. Example: A cam seal may
allow air to pass through whereas a drain plug or pressure sensor will not. To locate oil leaks it is
necessary to pressurize the crankcase with smoke.
1. Remove the dipstick and slip a hose over the dipstick tube, and insert the smoke supply nozzle into
the hose.
2. Plug the PCV, air breather, and intake. Remove the oil filler cap.
3. Introduce smoke into the crankcase until smoke is seen exiting the oil filler port.
4. Install the oil filler cap and continue filling the system.
5. Use the spotlight to check for leaks, which could appear as seeping smoke, bubbling oil with little or no
smoke, or dripping oil with no smoke at all.
Brake Booster Leaks
A leaking vacuum brake booster not only effects engine performance like other types of vacuum leaks, but
more importantly, it can seriously affect the stopping power of the vehicle. The brake booster is a simple
component to check for leaks.
1. Disconnect the vacuum supply line and the check valve from the brake booster.
2. Insert the smoke supply nozzle into the brake booster and begin introducing smoke.
3. Under the hood, look for smoke exiting around the crimped area of the booster canister. Also look inside
the vehicle under the dash. NOTE: Do not depress the brake pedal while performing this test.
Component Leak Testing (radiators, water pumps, valves, etc.)
When installing new or rebuilt parts nothing is more frustrating than to discover on completion of the job that
the component is faulty, or has a leak. It is far easier to inspect a radiator or water pump before it is installed
than to find out after the job is completed and the antifreeze is installed, that there is a leak. Component
leak testing has endless possibilities; anything from hoses to diaphragms can be tested. Supplied with every
MotorVac Cool Smoke is an exhaust cone adapter that can be used to access any opening from 1” to 3 ½”.
Simply introduce smoke into the system being tested, seal any inter-connecting ports or passages and look
for the smoke or dye to exit a leak.
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