C700 w/361 engine
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
sometimes the old filter gasket gets stuck in the housing and has to be pried out with a screwdriver. Or there is dirt in there. I am not sure if you have a spin on filter like a Napa 1515 or if it is a canister type. I am assuming it is a spin on type. So please tell me what you have for sure. I don't recognize the numbers you are using so I am prolly wrong and it is a canister type. If so than again the old gasket may still be stuck in there and it won't seal properly.
Also my 2 cents on the Fram filter is that they are not a very good one.
Also my 2 cents on the Fram filter is that they are not a very good one.
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Senior User
Joined: Jun 2012
Posts: 148
Likes: 1
From: Southern Nevada
spin on oil cartridge
truck had a napa 1773 spin on, but it is too small, just don't look right. so i scoured my parts catalog and i believe i need a d9az 6731[ford p/n].
thanks for the feed back. Bill "numbers dummy" told me 1958 Edsil had same parts on the 361 engine
thanks for the feed back. Bill "numbers dummy" told me 1958 Edsil had same parts on the 361 engine
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Senior User
Joined: Jun 2012
Posts: 148
Likes: 1
From: Southern Nevada
I had a similer problem on a FT391 . What is your oil presure at cold start? What is it warmed up? The truck I was working on the pressure relief valve would stick when cold and then would release after a few minutes, it would blow out the filter seal , or leak out of the sending unit until the pressure dropped. This engine would have over 100 PSI.
for a few minutes then would drop back to 60PSI cold . Hot ideling 35 PSI at 2000 RPM it had 55PSI. Cleaned the relief valve and no more problems. 
Just Some Thoughts ------- Hotwrench
for a few minutes then would drop back to 60PSI cold . Hot ideling 35 PSI at 2000 RPM it had 55PSI. Cleaned the relief valve and no more problems. Just Some Thoughts ------- Hotwrench
i was thinking maybe oil is too heavy a sae weight, but dont know. where is pressure relive valve ???
Last edited by madrid london; Oct 18, 2012 at 08:03 AM. Reason: misquote
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
330 H/D, 361 & 391 use a cartridge oil filter.
C4TZ-6881-A .. Oil Filter Adapter-Use with cartridge oil filter-330 H/D, 361 & 391 FT engines.
C1TZ-6731-A .. Cartridge Oil Filter Kit, includes 4 gaskets (Motorcraft FL-20).
2) EAA-6746-A .. Cartridge Oil Filter Gasket ~ 1.24" O.D. x .72" I.D. x .12" thick.
1) EAA-6749-A .. Cartridge Oil Filter Center Bolt to Cover Gasket ~ 1.18" O.D. x .77" I.D. x .06" thick.
1) EAA-6838-A .. Cartridge Oil Filter Mounting Gasket.
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1975/78 Mustang II: Ford had to "shoehorn" the 302 into the engine compartment, uses a different oil filter: Motorcraft FL-300. Same as FL-1A except shorter.
Elder User
Joined: May 2004
Posts: 565
Likes: 3
From: saxton pa.
Oil Pressure
Tom the pressure relief valve is located in the body of the oil pump, you will need to pull the oil pan and remove the pump. If the pressure relief valve is scored or the bore is damaged your best bet is just to replace the pump. Many time bits of hard valve seal material will get into the pump and cause this problem. Sometimes there is coked oil on the exh crossover and this material will break off and find its way into the oil system. Or it could be a chunk of silicone gasket sealer AKA ( the blue death ), it may be just a good idea just to pull the pan and give it a proper cleaning. 
Have A Great Day ---------- Hotwrench
Have A Great Day ---------- Hotwrench
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Senior User
Joined: Jun 2012
Posts: 148
Likes: 1
From: Southern Nevada
i seem to have same problem, my pressure sending unit is functioning now and i have high pressure reading[no numbers just hi n lo indication]at start up and then drops after engine warm up.
i was thinking maybe oil is too heavy a sae weight, but dont know. where is pressure relive valve ???
i was thinking maybe oil is too heavy a sae weight, but dont know. where is pressure relive valve ???
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Edsel 361 not the same as a 361 FT engine, only used in 1958 and was a slight overbore of the 352.
If you had asked for a Spin-On filter for a 1958/60 Edsel 223/292/332/352 you still woulda got FL-1A. Or a 1960 Thunderbird 430, 1965 Mustang 289, or any other I-6 or V8 engine from 1957 thru the 1990's.
Excepting 1975/78 Mustang II 302 that uses FL-300.
If you had asked for a Spin-On filter for a 1958/60 Edsel 223/292/332/352 you still woulda got FL-1A. Or a 1960 Thunderbird 430, 1965 Mustang 289, or any other I-6 or V8 engine from 1957 thru the 1990's.
Excepting 1975/78 Mustang II 302 that uses FL-300.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
But, I haven't a single clue what Fram or NAPA (whatever) part numbers are the same as FL-1A as I've never bought an aftermarket filter. Why would I need to since Ford dealers stocked 100's of genuine Ford filters?
Original 1957/60 Spin-On filter only had a Ford part number: B7A-6731-A / B7A-6731-A replaced in 1961 by C1AZ-6731-A (1962/72 Auto-Lite/1973/78 Motorcraft part number FL-1).
C1AZ-6731-A replaced in 1979 by D9AZ-6731-A (Motorcraft FL-1A).
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Senior User
Joined: Jun 2012
Posts: 148
Likes: 1
From: Southern Nevada
oil filter
i drained oil, it looked old & used. put in 3/4 gallon kerosene and some new oil; run engine for 1/2 hour. drained kerosene, replaced with new oil and oil filter. no blow by from filter on start up and oil pressure looks good, cross my fingers. this saturday's competion is on the otherside of the valley[20 miles] and will be returning late 9-10pm