Foreword

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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34, Propulsion, powertrain and powertrain fluids.

This second edition cancels and replaces the first edition (ISO/TS 17536-2:2017), which has been technically revised.

The main changes are as follows:

update of Figure B.1, Table B.1 and Figure C.1.

A list of all parts in the ISO 17536 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

The engine crankcase blowby is composed of combustion exhaust gases which have escaped to the crankcase via piston ring seals and lube oil aerosols generated by thermal and mechanical action within the engine. These gases are vented from the crankcase to prevent a build-up of high pressure. The constituents of vented engine blowby gases are recognized as an undesirable contaminant and technology for their containment is therefore evolving.

The device, used to separate oil aerosols from the blowby, typically releases cleaned gases to the atmosphere or alternatively returns the cleaned product to the combustion process by feeding into the engine air intake prior to the turbo compressor if present. The latter has led to the requirement for a pressure control device to isolate the engine crankcase from air intake pressure.

It is the purpose of this document to define standardized and repeatable test procedures for the evaluation of blowby oil aerosol separators and filtering devices using this laboratory gravimetric test method.

1 Scope

This document defines standardized and repeatable test procedures for the evaluation of blowby oil aerosol separators and filtering devices and specifies laboratory gravimetric separation efficiency and system pressure tests in both open and closed crankcase ventilation systems. This document has a limitation of 0 % to 99 % for aerosol gravimetric efficiency.

NOTE Gravimetric efficiencies > 99 % can be difficult to measure due to long test durations and absolute filter weight measurements.

Filter life is not evaluated in this document.

This test method only applies to devices that have a defined tubular inlet, outlet and drain that can be connected to the test equipment. For devices that lack such connections, for example, one that is built into a valve cover, see Annex A.

2 Normative references

3 Terms and definitions

4 Measurement accuracy

5 Test materials and test conditions

5.1

5.2

5.3

5.4

6 Test procedure

6.1

6.2

6.3

6.4

6.5

6.6

6.7

6.8

Bibliography