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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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D5 158kw 2015 tapping/knocking soundsViews : 2096 Replies : 16Users Viewing This Thread : |
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#11 | |
New Member
Last Online: Jul 19th, 2024 12:57
Join Date: Nov 2017
Location: Narva-Jõesuu
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#12 |
New Member
Last Online: Yesterday 14:26
Join Date: Jan 2023
Location: Kutina
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I have visited 7-8 workshops so far and no one has any idea...
![]() I do not know, but it seems to me that this is not such a rare problem with the 2015-> D5 engine ![]() |
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#13 |
New Member
Last Online: Apr 26th, 2024 21:57
Join Date: Nov 2023
Location: Bled
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Hello,
I have the same problem with my S60 D5 158kw my12. I have noticed the engine is running quieter when dpf is regenerating. Did any of you noticed that? |
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#14 | |
New Member
Last Online: Jul 19th, 2024 12:57
Join Date: Nov 2017
Location: Narva-Jõesuu
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But i have noticed it is considerably louder during acceleration when regenerating. |
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#15 |
Premier Member
Last Online: Today 08:47
Join Date: Jun 2009
Location: Devon
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Vacuum pump ? Is there a slight vacuum leak anywhere ?
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#16 | |
Premier Member
Last Online: Today 03:53
Join Date: Oct 2011
Location: Groningen
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The goal with regeneration is to raise exhaust temperature its been done by retarding the injection timing, smear out the time of the injection (by lowering railpressure) and a post injection. if you retard the injection starting point then there is less expansion possible because already before the injection there is already some expansion occured Because of the less expansion possible there is less heat extracted of the burned fuel hence a higher exhaust temperature , where also a post injection will occur to raise the temperature even further. The injection retarding and smearing out the injection pulse will drasticly lowering the peak pressures in the cillinder hence the noise and vibrations will temper.... in a already good functioning engine .... but if there is already something wrong with the injection timing or callibrated flowing of the injector(s) this effect will be magnified and more noticable For instance in my normal functioning engine (2006 engine) its noticable not so much in noise ,but more in smoothness |
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#17 |
New Member
Last Online: Apr 26th, 2024 21:57
Join Date: Nov 2023
Location: Bled
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No leak at all. I’ve changed diaphragm on vacuum pump, and it’s little quieter, but still knocking present.
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d5 v70 2015 |
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