DETROIT DIESEL 53
C y l i n d e r Block 1.1
than .001 " out of alignment, the block must be
it to remove the rust preventive and blow out
line-bored or scrapped. Misalignment may be
the oil galleries with compressed air.
caused by a broken crankshaft, excessive heat or
1. Mount the block on the overhaul stand.
2. If a new service replacement block is used, stamp,
d. If the main bearing bores are not in alignment or
the engine serial number and model number on the
a replacement bearing cap is used, the block must
upper rear corner of the In-Line block.
be line-bored. Install the bearing caps in their
Also stamp the
original positions (without the bearing cap
position numbers on the main bearing caps (Fig 14)
stabilizers) and tighten the bolts to the specified
and the position of the No. 1 bearing on the oil pan
torque (Section 1.0). Line-bore the block, but do
mounting flange of the block.
not remove more than .001 " stock. After boring,
all bores must be within the specified limits of
3. Install all of the required plugs and drain cocks. Use
3.251 " to 3.252 " (In-Line block).
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
5. Replace loose or damaged dowel pins. The dowels at
plugged correctly to prevent low oil pressure or the
the ends of the cylinder block must extend .680 " from
accumulation of abnormal quantities of oil in the
the cylinder block face.
The dowels used to retain the crankshaft thrust
4. Clean and inspect all of the engine parts and sub-
washers on the rear main bearing cap must extend
assemblies and, using new parts as required, install
.107 " to .117 " from the surface of the bearing cap.
them on the cylinder block by reversing the sequence
of disassembly. The procedures for inspecting and
installing the various parts and sub-assemblies are
6. Check all of the machined surfaces and threaded
outlined in the following sections of this manual.
holes in the block. Remove nicks and burrs from the
machined surfaces with a file. Clean-up damaged
5. Use a chain hoist and suitable sling to transfer the
threads in tapped holes with a tap or install helical
engine to a dynamometer test stand.
6. Install the air box covers and tighten the bolts. On
7. After inspection, if the cylinder block is not to be
In-Line engines, tighten the bolts to 12-16 lb-ft torque.
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.
7. Complete the engine build-up by installing all
remaining accessories, fuel lines, electrical connections,
Assemble and Install Engine
After the cylinder block has been cleaned and
8. Operate the engine on a dynamometer, following
inspected, assemble the engine as follows:
the RUN-IN procedure outlined in Section 13.2.1.
NOTE: Before a reconditioned or new service
9. Reinstall the engine in the equipment which it
replacement cylinder block is used, steam clean
SEC. 1.1 Page 9