Engine Crankcase Pressure (Blowby) - Test
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| Tools Needed | |||
| Tool | Part Number | Part Name | Quantity |
| A | 8T-2700 | Blowby/Air Flow Indicator | 1 |
Damaged pistons or rings can cause too much pressure in the crankcase. This condition will cause the engine to run rough. There will be more than the normal amount of fumes (blowby) rising from the crankcase breather. The breather can then become restricted in a very short time, causing oil leakage at gaskets and seals that would not normally have leakage. Blowby can also be caused by worn valve guides or by a failed turbocharger seal.
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| Illustration 1 | g00286269 |
8T-2700 Blowby/Air Flow Indicator | |
Use Tooling (A) in order to check the amount of blowby. Refer to Special Instruction, SEHS8712, "Using the 8T-2700 Blowby/Air Flow Indicator " for the test procedure for checking the blowby.
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