Re: [Chrysler300] 300 F- Mysterious Oil Pump Loses Prime

["John Grady jkg@xxxxxxxxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

One known problem with B blocks of the era was stripping or breaking off of the oil pump drive hex where it goes into pump . The pump drive is more highly loaded with cold oil , and could be on verge of stripping out . Or hex in pump . I had a friend that lost two 426 max wedge brand new cars due to this . Both times while racing at high rpm . Some one like Miloden makes super pump drives and pumps . Sometimes Chinese junk gets into our parts places .. happened to me on slant six oil pump ,drive  gear spun on shaft almost lost engine . Investigation =too loose for intended press fit . 
Not saying for sure . I also understand oil filters have anti drain back valves , might have failed . Mopar filters are worth it . At dealer . Saw dissection of filters , some name brands are junk inside . Mopar has to be sure it works.. warrantee on engine . 
Hope this helps .. 
cracks at oil pickup pipe could also let air into suction side .. 
let us know if you find anything definitive ? 

Sent from my iPhone not by choice 

> On 27 Nov 2018, at 11:51 am, mark love marklove@xxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
> 
> Had a unique issue and would appreciate any comments that might keep it from happening again.  Drove my 300F for 10 days or so in October and put it away in the garage.  Just connected the battery.  Was running 50/50 91 non lead and /110 lead fuel.  Car recently tuned and running beautifully.  Came back to the garage and she fired up with some gently pedal work, but got noisy fast on the top of the motor.  Looked down and no oil pressure.  Turned it off.  Waited,  Turned it over.  Same result.  Turned it off.  Took off the oil pump and everything looked fine (motor rebuilt by George Riel in ’04 but only 7,000 mi ago, engine oil is fresh and looks clear, changed in 5/18, is 10-30 conventional with ZDDP at 1600 ppm).  Re-oiled the internals and put it back in.  Started her up and presto, all is well.  Would anyone opine on how the pump lost its prime, which is the only conclusion I could come to?  Any ideas on how to keep it from happening again as the car will sit after this week for 5 months over the winter?
> Mark.   
> 
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> Posted by: mark love <marklove@xxxxxx>
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Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>
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