DETROIT DIESEL 53
ENGINE FRONT COVER (Lower)
The engine lower front cover is mounted against the cylinder block at the lower front end of the engine (Fig . 1). It serves
as a housing for the crankshaft front oil seal, the lubricating oil pump, the oil pressure regulator valve and the oil cooler
by-pass valve. The clean-out openings in the periphery of the current cover incorporate tapped holes and 1/2 "-14
On all In-line engines effective with engine serial number 3D-4295 (except 3D-4373), the oil pressure regulator valve is
located on the right-hand side of the engine front cover, as viewed from the front of the engine. Prior to the above engine
serial numbers, the oil pressure regulator valve was located on the left-hand side of the front cover just below the oil
cooler by-pass valve.
Remove Engine Front Cover
Drain the oil and remove the oil pan.
3. Remove the two bolts and lock washers that secure the lubricating oil pump inlet tube flange or elbow to the engine
Remove the bolts and lock washers that secure the engine front cover to the cylinder block.
Strike the cover with a soft hammer to free it from the dowels. Pull the cover straight off the end of the crankshaft.
Remove the cover gasket.
7. Inspect the oil seal and lubricating oil pump as outlined in Sections 1.3.2 and 4.1. Also check the oil pressure
regulator valve and oil cooler by-pass valve as outlined in Sections 4.1.1 and 4.4.
Fig. 1 - Engine Front Cover Mounting (Lower) -- In-Line Engine