Date: Tue, 21 May 2019 16:05:37 +0000
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: oil pump failure? please help...
In-Reply-To: <29074F6C-6336-423B-A3ED-E8F29CD10FC5@sbcglobal.net>
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The dirt concept is mentioned in the service manual for the Caterpillar engine in my motor home. As for the pump priming, the oil pump does a lousy job pumping air. Worse, it needs the oil film between the gear teeth and housing for it to even work. If the pump empties it will prime faster if there is no restriction on the output side allowing to more easily pull some air and oil into the suction pipe and body. Once this occurs the filter will fill very fast. If you do in fact do not have oil pressure remove the filter and somehow push some oil into the other hole in the filter-oil cooler mount. This will get the pump gears wetted. You can also quickly start and stop the engine with the filter off to ensure the pump is pumping. It is rare but you wouldn't be the first to have one of these pumps actually fail. Shaft going loose inside of the gear or the drive tab wearing-breaking off have happened.
Dennis
-----Original Message-----
From: Michael Magnani <mfmagnani@sbcglobal.net>
Sent: Tuesday, May 21, 2019 9:38 AM
To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Cc: vanagon@GERRY.VANAGON.COM
Subject: Re: oil pump failure? please help...
Dennis,
As always, I read each and every one of your posts, as they are a wealth of information, both practical and theoretical. Up until now, I have always pre-filled the oil filter, because that's how my dad taught me. Your comment about introducing unfiltered oil makes perfect sense. Can you please help me understand how pre-filling the filter makes it harder for the oil pump to prime?
Kind regards,
Mike M
Sent from my iPad
> On May 21, 2019, at 08:04, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
>
> Is the oil pressure light working? If so does it go out when the engine starts? If yes than you have oil pressure. If not maybe the pump lost its prime. Filling filter before installing actually makes it harder to get the pump to prime and is considered a bad practice as that oil enters the engine un-filtered and you increase the chance of picking up dirt as you handle the filter and pour the oil.
>
> If you do have oil pressure (light turns off) look for sticking valve, bled down lifter or even a push rod that fell out. Sticking valves can do that.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of Dan N
> Sent: Monday, May 20, 2019 12:32 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: oil pump failure? please help...
>
> hi all,
>
> yesterday I changed the oil as I did as usual (nothing special) on my son's 2WD tintop..
> - warm up the engine
> - drain the oil
> - remove the oil filter
> - fill the new oil filter and put it back
>
> once done I started it up.. now there's metallic clanking noise (looking like at the bottom of the engine - no not a forgotten tool in the engine
> bay) and the the oil warning light came on with the buzzing noise...
>
> it seems to me the oil pump is bad or fail to prime...
>
> - how this happened? (I change the oil many many times before).
> - what should I do? - let it run at idle till the noise go away?
> - get it towed to the mechanic? (scary engine rebuild looming on the
> horizon)
>
> *note: the engine was rebuilt about 40K miles ago. Oil is Mobil1 15W50, Mann oil filer*
>
> thank you,
>
> dan
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