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The 1982, 1983, and most 1984 oil pans were all of one style. In late 1984 the pan was changed for a new style that is about one half inch deeper to ensure adequate oiling during hard cornering. These newer style pans are found on some late 1984 cars, and all 1985 and 1986 vehicles.

The change used a different oil pump to increase the pump flow rate. This was achieved by lengthening the height of the pump gears. This drops the oil pickup of the new pump down to the correct height to get the oil pickup at the bottom of the new deeper pan. The new pump does not just have a longer pickup tube.

All the replacement oil pumps that are sold appear to be the later type. If you replace the oil pump you may have problems sealing the oil pan because the oil pickup may touch the inside of the pan and prevent it from sealing properly.

12101-49295 PAN SUB-ASSY, OIL (07/1981 – 11/1985) Discontinued
12101-43040 PAN SUB-ASSY, OIL (08/1984 – 12/1985) Discontinued

How do you tell whether you have the early or the late style?

The most obvious change is the addition of a fitting for an oil cooler return line that was only used on European model vehicles.

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12101-43040 PAN SUB-ASSY, OIL
The yellow circle highlights the oil drain plug and has not changed location or type. The red circle highlights the fitting designed for an oil cooler return line. The older style pan will not have the oil return line fitting.



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New Style oil pan flange ribs 1/4" width whereas older style oil pan flange ribs measure about 3/8" width.

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New Style oil pan is approximately 6 1/4" deep whereas the older style pan measures about 5 3/4" deep as measured from the bottom of the mounting flange to a straight edge laid across the pan.

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Late Style Oil Pump versus Early Style Oil Pump

The pickup on the left is retained with one bolt from above compared to the style on the right which has 4 bolts mounted from the bottom.
One could run the early style pump on the later style oil pan as long as you add more oil to bring the oil above the oil pickup.
If you run the later style pump with an early style pan, the oil pickup for the pump will be pressed against the bottom of the oil pan.

Dale
 

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The 1982, 1983, and most 1984 oil pans were all of one style. In late 1984 the pan was changed for a new style that is about one half inch deeper to ensure adequate oiling during hard cornering. These newer style pans are found on some late 1984 cars, and all 1985 and 1986 vehicles
And all 1987 and 1988 vehicles, too. In case someone's looking for one of these pans - the Cressida had the 5mge until 1988 model year.
 
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This is great info to know when re building a motor or just replacing a pan. I was aware of the side port and pulled a pan off of a 1988 Cressida for my 6M build but was not aware of the other significant differences.

Thanks Supraz.
 

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Be aware the oil cooler return is not a large enough fitting for a turbo oil return.
 
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