DETROIT DIESEL 53
Cylinder Block 1.1
than .001 " out of alignment, the block must be line-bored or scrapped. Misalignment may be caused by a
broken crankshaft, excessive heat or other damage.
If the main bearing bores are not in alignment or a replacement bearing cap is used, the block must be line-
bored. Install the bearing caps in their original positions (without the bearing cap stabilizers) and tighten the
bolts to the specified torque (Section 1.0). Line-bore the block, but do not remove more than .001 " stock. After
boring, all bores must be within the specified limits of 3.251 " to 3.252 " (In-Line block).
5. Replace loose or damaged dowel pins. The dowels at the ends of the cylinder block must extend .680 " from the
cylinder block face.
The dowels used to retain the crankshaft thrust washers on the rear main bearing cap must extend .107 " to .117" from
the surface of the bearing cap.
6. Check all of the machined surfaces and threaded holes in the block. Remove nicks and burrs from the machined
surfaces with a file. Clean-up damaged threads in tapped holes with a tap or install helical thread inserts.
7. After inspection, if the cylinder block is not to be used immediately, spray the machined surfaces with engine oil. If
the block is to be stored for an extended period of time, spray or dip it in a polar type rust preventive such as Valvoline
Oil Company's "Tectyl 502-C", or equivalent. Castings free of grease or oil will rust when exposed to the atmosphere.
Assemble and Install Engine
After the cylinder block has been cleaned and inspected, assemble the engine as follows:
NOTE: Before a reconditioned or new service replacement cylinder block is used, steam
clean it to remove the rust preventive and blow out the oil galleries with compressed air.
Mount the block on the overhaul stand.
2. If a new service replacement block is used, stamp the engine serial number and model number on the upper rear
corner of the In-Line block. Also stamp the position numbers on the main bearing caps (Fig. 14) and the position of the
No. 1 bearing on the oil pan mounting flange of the block.
3. Install all of the required plugs and drain cocks. Use a good grade of sealing compound on the threads of the plugs
and drain cocks. If a new service replacement block is used, make sure the top surface is plugged correctly to prevent
low oil pressure or the accumulation of abnormal quantities of oil in the cylinder head.
4. Clean and inspect all of the engine parts and sub-assemblies and, using new parts as required, install them on the
cylinder block by reversing the sequence of disassembly. The procedures for inspecting and installing the various parts
and sub-assemblies are outlined in the following sections of this manual.
Use a chain hoist and suitable sling to transfer the engine to a dynamometer test stand.
Install the air box covers and tighten the bolts. On In-Line engines, tighten the bolts to 12-16 lb-ft torque.
Complete the engine build-up by installing all remaining accessories, fuel lines, electrical connections, controls etc.
Operate the engine on a dynamometer, following the RUN-IN procedure outlined in Section 13.2.1.
Reinstall the engine in the equipment which it powers.