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post #1 of 18 (permalink) Old 05-19-2019, 12:09 PM Thread Starter
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Oil warrning light

Hi

I have just bought an 69' Mach1 with 351M engine. I have an issue. when I start the engine the oil warning light go for 2-3s on and then off when the pressure idle reach middle of the scale (between L and H). Is it something I should be worried about?
that is my first Mustang and don't know what I should think about. Engine runs very smoothly...

Mach1 69' 351M FMX
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post #2 of 18 (permalink) Old 05-19-2019, 01:02 PM
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I wouldn't worry about it.
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post #3 of 18 (permalink) Old 05-19-2019, 01:16 PM Thread Starter
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Thanks a lot for a quick reply.

Is it the normal behawior in Mustangs?
what could be the reason for it? Is it the oil, oil filter or maybe the pump which has problem with building the pressure up?

Mach1 69' 351M FMX
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post #4 of 18 (permalink) Old 05-19-2019, 01:36 PM
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Originally Posted by wodzu View Post
Hi

I have just bought an 69' Mach1 with 351M engine. I have an issue. when I start the engine the oil warning light go for 2-3s on and then off when the pressure idle reach middle of the scale (between L and H). Is it something I should be worried about?
that is my first Mustang and don't know what I should think about. Engine runs very smoothly...

That's interesting, it sounds like you have an oil gauge and a light? My 69 Mach has a gauge but no light, and a light is not shown on the wire diagram. I'm wondering where your warning light is located in the dash? Mine has Brake Warning and Seat Belt lights in the Fuel/Temp cluster. I have heard there are different options like Deluxe Complete.

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post #5 of 18 (permalink) Old 05-19-2019, 01:40 PM Thread Starter
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Originally Posted by Mach1 Driver View Post
That's interesting, it sounds like you have a gauge and a light? My 69 Mach has a gauge but no light, and a light is not shown on the wire diagram. I'm wondering where your warning light is located in the dash? Mine has Brake Warning and Seat Belt lights in the Fuel/Temp cluster. I have heard there are different options like Deluxe Complete.
It is on the right side where the fuel and temperature gauge is - maybe I am wrong and this is not an oil warning light?
BTW the temperature gauge doesn't work but the cooling system is ok - I have the system rebuild to electrical vents and they are working when the engine is warm/hot...

Mach1 69' 351M FMX

Last edited by wodzu; 05-19-2019 at 01:48 PM.
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post #6 of 18 (permalink) Old 05-19-2019, 01:58 PM
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From the Owners Manual.
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File Type: jpg 69 Owners Manual Original 3.jpg (270.3 KB, 19 views)

5R09A 4 Speed GT Built 5/29/65
9T02R 4 Speed SCJ Built 9/19/68
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post #7 of 18 (permalink) Old 05-19-2019, 02:01 PM Thread Starter
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From the Owners Manual.
That means that would be the belt indicator? Why it is then going of after few seconds?

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post #8 of 18 (permalink) Old 05-19-2019, 02:07 PM
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That means that would be the belt indicator? Why it is then going of after few seconds?

Do you have a tach? If so then you have an oil light, but no oil gauge.
I was concerned it may have been the dual brake warning light. That means trouble with the brakes.

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post #9 of 18 (permalink) Old 05-19-2019, 02:13 PM Thread Starter
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Do you have a tach? If so then you have an oil light, but no oil gauge.
I was concerned it may have been the dual brake warning light. That means trouble with the brakes.
No I do not have the tach. I have the standard instrument panel. The brakes works very good - the car was imported 2 weeks ago form USA to Poland and had the technical inspection last Friday for the registration

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post #10 of 18 (permalink) Old 05-19-2019, 02:24 PM
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Quote:
Originally Posted by wodzu View Post
That means that would be the belt indicator? Why it is then going of after few seconds?
Early cars did not put in wiring to actually check to make sure the belts were fastened, so they simply used a light with a capacitor (or similar device) that charged when the engine was started and quickly died out. So you see the Belt lamp light up, and then go out. Just a reminder to fasten your belts. I do not believe there was a Belt lamp in the cluster of a Tach cluster, but on the metal dash by the ignition switch, usually included with the Park lamp. The illustration by Brian Conway indicates a lamp on the non tach cluster, my wiring guide does not show this.

I am also in this conversation Oil warrning light 69' Mach 1 351M - 1969-70 Technical Forum - 69stang.com and 1969stang.com The 1969 and 1970 Mustang Supersite

VMF Build Thread - 1969 Shelby GT350 Hertz rebuild Gallery
Used by Hertz for the 1969 "Rent-A-Racer" program at Miami Internation Airport.

Last edited by 69GT350H; 05-19-2019 at 02:35 PM. Reason: Added info, revised info
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post #11 of 18 (permalink) Old 05-19-2019, 02:28 PM Thread Starter
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Early cars did not put in wiring to actually check to make sure the belts were fastened, so they simply used a light with a capacitor (or similar device) that charged when the engine was started and quickly died out. So you see the Belt lamp light up, and then go out. Just a reminder to fasten your belts.

I am also in this conversation Oil warrning light 69' Mach 1 351M - 1969-70 Technical Forum - 69stang.com and 1969stang.com The 1969 and 1970 Mustang Supersite
Thanks a lot for your help guys. I can sleep now much better

Mach1 69' 351M FMX
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post #12 of 18 (permalink) Old 05-19-2019, 03:49 PM
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On a side note, your Sig states 351M. The 351C/M engines have the upper radiator hose straight up off the block then running forward to the radiator, a Windsor has the radiator hose coming off the intake almost straight forward. Check wich one you have and change your signature to match. :-)

351w


351c/m


It would be more normal to find a 351c than a 351w in a Mustang.

VMF Build Thread - 1969 Shelby GT350 Hertz rebuild Gallery
Used by Hertz for the 1969 "Rent-A-Racer" program at Miami Internation Airport.
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post #13 of 18 (permalink) Old 05-19-2019, 03:58 PM Thread Starter
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I have this...
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post #14 of 18 (permalink) Old 05-19-2019, 04:02 PM
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351W. Nice looking too.

Bob

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post #15 of 18 (permalink) Old 05-19-2019, 04:10 PM Thread Starter
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Thanks😁
my description is based on the engine codes decoders for all mustangs. I understood the M has nothing to do with Windsor and Cleveland but it fits to the power version.

BTW was such an shaker option by mach1 or is it an mode to let it looks like cobra jet?

Mach1 69' 351M FMX
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