SuperMotors.net Forums
RenoNineOneOne
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• Central, GA, USA |
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• Registered on 10/19/2013 |
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• 14 posts |
• 1 Vehicle
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 Posted:10/19/2013 11:55 |
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Hello,
I'm new to late model Crown Victorias, but not to cars or wrenching. I've been building, modifying, fixing and racing (mostly Mopars) for 30 years. Decided I wanted a P71 when they started flooding the market for reasonable $$$. This summer, I got a retired squad car for cheep which runs/rides/drives great. Makes a whining when cold since I picked it up (cold start, not necessarily cold day). Also makes the usual 4.6 rattling from the chain guides until the pressure kicks in. I was going on the whining being a tensioner/idler pulley or the p/s pump. Being as it's hot and muggy as hell here in GA for most of the year, I put off messing with it until the other day. Put 3000 miles on it in the meanwhile with no problems. Long story short, it is not any of the above. I isolated the noise to the oil filter base/oil hose port housing with a stethoscope. I have to assume the noise is coming from the oil pump, or possibly the relief valve. Noise gets quiet after engine warm-up. Engine is filled with factory recommended 5W-20, although @ 100,000+ miles, I'm thinking of switching to 5W-30 or (OH MY GOSH!) 10W-30.
My hopes that this engine was like a big block Chrysler, upon which the external pump can be swapped in about 5 minutes, were dashed when I read the 164-step process for R & R pump in the Service Manual. If I have to break down the entire motor just to swap the pump, I'll just drive this one 'till it explodes, then buy another P71.
Any thoughts, similar experiences, or suggestions?
Thanks!
P. S. - I tried joining crownvic.net, but that seems to be a more arduous process than swapping a 4.6 oil pump... |
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RenoNineOneOne
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• Central, GA, USA |
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• Registered on 10/19/2013 |
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• 14 posts |
• 1 Vehicle
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Posted:10/19/2013 11:57 |
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Sorry for duplicate post - I don't see any way to delete. |
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jdmeaux
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• Lafayette, LA, USA |
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• Registered on 1/5/2009 |
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• 525 posts |
• 1 Vehicle
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Posted:10/19/2013 16:40 |
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Whining has always been a problem with the modular Ford engine. Now you understand why so many guys use billet parts when doing a rebuild.
AT crownvic.net, it can be a problem since the moderators don't spend as much time as you would expect, but the last 5 years things have been slow. I've been telling most guys to pm a forum moderator about joining, and they usually get it done after that.
There is also www.crownvic.ca, p71interceptor.ca, and a couple of others strictly for Crown Vics. But you can usually go to some of the Mustang forums and get the same info. CorralNet (forums.corral.net/forums/) and www.allfordmustangs.com/forums/ are also good links. And I think there are a few general Ford forums that have sub-forums for CV, GM, and TC coverage. Just search for Ford auto forums.
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PROUD MEMBER of www.crownvic.net
It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.
1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified. 
13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane
I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter
.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos
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RenoNineOneOne
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• Central, GA, USA |
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• Registered on 10/19/2013 |
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• 14 posts |
• 1 Vehicle
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Posted:10/19/2013 18:10 |
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| Quote: | Now you understand why so many guys use billet parts when doing a rebuild.
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? No I don't!
Thanks for the other info. I'm still tracking this problem down, but I believe there may be some sort of oil cooler bypass valve in the filter adapter. Can you verify or debunk this theory? I'm still studying on this possibility. It sounds like some sort of valve buzz. I'm thinking more and more that a pump issue would get worse/stay same with engine and oil temp increase. My noise goes away.
Thanks. |
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roger330
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• phila, PA, USA |
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• Registered on 10/10/2013 |
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• 9 posts |
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Posted:10/20/2013 19:47 |
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Renonineoneone I'm new to owning a crown vic to but hopefully someone can answer your question but if you find out what is causing the whine or if there is some pressure valve that can be replaced can you post up your findings. Just incase I have a problem or someone else down the road |
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RenoNineOneOne
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• Central, GA, USA |
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• Registered on 10/19/2013 |
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• 14 posts |
• 1 Vehicle
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Posted:11/3/2013 15:54 |
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I'm now convinced that the buzz/whine is coming from the cooler bypass valve. I removed and inspected it and its spring, and could find no obvious issue with it. I'm pretty sure it can be either shimmed tighter (or shut, which should allow full time cooler action), or simply left out which I would think would always allow a small amount of flow bypass the cooler. I am amazed that I can find absolutely NO information on the operation of this valve either on-line or in my factory service manuals (I even have a police/fleet training manual which mentions zilch about its function).
My next step is to pick up a spare P71 filter base at the junkyard, so I can fiddle with it and investigate function. I don't want to experiment on the car until I see what it's designed to do. I'll report back. Please advise, anyone, if you have additional experience, information or links to helpful info.
RNOO |
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