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#2399521 - 10/07/11 08:51 PM Momentary Engine Knock after Oil Change
bigsplash Offline


Registered: 07/09/10
Posts: 45
Loc: North of the 49th parallel
What would cause momentary engine knock less than 2 sec., after starting car immediately after changing oil. Did top up the oil filter halfway before install.
Is this normal?
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#2399523 - 10/07/11 08:53 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
aquariuscsm Offline


Registered: 12/30/06
Posts: 10528
Loc: South Texas,USA
Air bubble/pocket maybe?
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#2399539 - 10/07/11 09:08 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
JRed Offline


Registered: 06/01/09
Posts: 1638
Loc: Virginia
Yeah, it's normal. Some cars do it and some don't. My Subaru and Mirage don't - my grandparents Buick, uncle's F250, and both work trucks "knock" for two or three seconds after an oil change (even with the filter filled).

I wouldn't worry about it.
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#2399545 - 10/07/11 09:23 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
CROWNVIC4LIFE Offline


Registered: 04/13/09
Posts: 3735
Loc: Miami-Dade County
All my cars do it..No worry.
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#2399546 - 10/07/11 09:23 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
Virtuoso Offline


Registered: 02/25/03
Posts: 2644
Loc: Cow town, NE
The looser the bearings, the more it will knock like that. Normal to a general extent.

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#2399552 - 10/07/11 09:32 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
bigsplash Offline


Registered: 07/09/10
Posts: 45
Loc: North of the 49th parallel
I remember an old mechanic once telling me that he can tell a lot about an engine's general condition, by listening to how it sounds right after an oil change.
What exactly he was listening for I don't know, sure hope it wasn't for an engine knock.
The guy was an old timer and had an answer for everything, usually was always right too.
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#2399575 - 10/07/11 09:58 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
4x4chevydude Offline


Registered: 05/06/09
Posts: 701
Loc: Northern IL
until the new oil gets all places alot of cars knock at first start...no big deal IMO
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#2399654 - 10/08/11 12:16 AM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
crazyoildude Online   content


Registered: 07/23/08
Posts: 6137
Loc: new jersey
some knock and some dont all mine do...Its normal until the filter fills up...

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#2399665 - 10/08/11 12:54 AM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
Colt45ws Offline


Registered: 08/15/06
Posts: 7634
Loc: Central Washington
Ford Modulars do this..but it isnt rod knock. The timing chain tensioners are hydraulic and it tends to make a bit of noise right after a change.
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#2399719 - 10/08/11 06:26 AM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
demarpaint Offline


Registered: 07/03/05
Posts: 22175
Loc: NY
Some engines do this. Try filling the filter a bit more. I pre-fill the filter at the start of the OC, and install the filter last. During that time the level in the filter drops, so I add more oil to it. Try doing that next time if you aren't doing it now. In some cases what looks like a half filled filter after the oil is poured in, is a quarter filled about 10 minutes later.
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#2399998 - 10/08/11 01:58 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
Some do, some don't.
Not to worry.

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#2400295 - 10/08/11 08:02 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
rationull Offline


Registered: 04/28/07
Posts: 2673
Loc: California, USA
Another vote for it just happens on some engines. Never happened with my Civic, happens every time with my wife's Mazda3. I don't think it happens on our Suburban but I haven't noticed either way.

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#2400368 - 10/08/11 09:28 PM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
Whimsey Offline


Registered: 12/22/02
Posts: 3174
Loc: The Garden State
I don't prefill my oil filters, they mount horizontally. I have a brief 1 or 2 second noise at intitial start up after an oil change. Nothing to worry about. When I was using Fram's OCoD and it clacked on every start up and lasted more than a second or two, that's when to worry about wear.

Whimsey

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#2400785 - 10/09/11 10:59 AM Re: Momentary Engine Knock after Oil Change [Re: bigsplash]
artificialist Offline


Registered: 09/23/07
Posts: 7214
Loc: Florida
Usually I hear this on OHV engines with hydraulic lifters. When hydraulic lifters don't have enough oil in them, they act like solid lifters that are far out of adjustment.
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