C-15 and C-16 Industrial Engines – Engine Crankcase Pressure (Blowby) – Test

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 a normal amount of blowby fumes rising from the crankcase breather. The breather can then become restricted in a 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.

The 348-5430 Multi-Tool Gp , or the 285-0900 Blowby Tool Group is used to check the amount of blowby. Refer to Tool Operating Manual, NEHS1087, ” 348-5430 Multi-Tool Gp ” for the test procedure for checking the blowby.