It is in the oil pan, you will need to remove the oil pan to service it.
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The oil pan gasket is replaced by draining and removing the oil pan from underneath the vehicle. Be cautious when removing the pan as some oil will remain inside. Clean the edge of the pan with a light solvent to remove all of the old gasket, then dry thoroughly. Replace the gasket and reinstall the pan, torquing the bolts to specification.
firing order is 1, 3, 4, 2 for a 86' B2000
It is located in the oil pan on the botom side of the engine.
The 86-89 B2000 put out 86 hp @ 4800 rpm and 120 ft-lbs @ 2800 rpm. See the attached link for additional specifications.
dah stupid by removing the screw
on the passenger side next the oil pan
No fluid in the master cylinder
Yes, the 86-89 B2000 engine will bolt into the 86-93 B2200. There are two mounts that go from the engine to the transmission on either side, you'll need to transfer these from the B2200 engine onto the B2000 engine. You will also need to keep the lower radiator hose from the B2000. Mazdatrucking.com has additional information on engine swaps as well as forums.
I'm pretty sure it's 15 Gallons, I just bough an 86 B2000 and the specs online said 15 gallons.
usually next to the blinker fluid reservoir unless its turbo then its under the flux compasitor relay unit thingy