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The 71 series Detroit 2
stroke diesel is a dry liner engine which is 2 cycle. In other words every
time the piston goes down it is a power stroke. 71 means 71 cubic inches per
cylinder. They came in 2,3,4,6,V6,V8,V12,V16,V24 types. SEE
VIDEO AT BOTTOM OF PAGE These Happen to be My favorite
diesel engines
These engine were produced since the 1930's with
various configurations. 2 valve and 4 valve exhaust. Old style comp ratio of
17:1 New N series 18.5:1New Style turbo 17:1. With sleeve ports of .950 to 1.05. These
Dimensions as comparable to a intake valve size and they are cut at a angle
which imparts a swirl motion
to the incoming air charge.
The single most cause of engine
problems with these
is the use of multi-grade engine oil. ie,15W40. These engines
were designed to operate on straight weight engine oil ONLY 30W or 40W as this engine has cast iron full round pistons the running
clearances are tight .002 to .003 piston to liner clearance. Plus the
inverted scraper type oil rings(4) have a high tension abutment ring
which causes a "slicing action" to the oil. Multi grade oil cannot
stand up to this type of abusive use.
Everyone wanted to
"In-Frame" overhaul these engines. The parameters
for a In-frame overhaul are very tight. The reason is that these engines
require a
super charger to supply air thru the internal air box, which means this
engine has
a top and bottom half. These two parts move over time front to back, so when
a standard or .001 liner is used it cannot conform to the misaligned block.
Within
about 20 to 50 hrs the pistons are wiped out. See Photos right (click for
larger).
What will happen is the pistons will seize in the liner and actually pull
the connecting
rod apart. Sometimes it will pull the rod pin bolt (x-head rods) out of the
piston pin.
This will cause the rod still connected to the crankshaft to whip around
inside the block and cause serious and fatal block damage (see photo). I
could write about these engines for weeks and still not cover all the things
about these engines.
The end result is you cannot just throw these
engines together.
I get these engine in that have had the pin caps
installed with a socket Instead of the
cap upset tool designed for this. I also get them in where the Liner has
been installed
in the block and a automotive type piston ring compressor was used to
compress the
rings on the piston and them installed piston from the top of the liner.
This breaks
all the cast iron oil rings scrapers and causes the piston to seize.
900 HP 12V-71 TTA
Inverted oil
Scraper Rings
71 Inline Turbo
Liner Pressure areas
71 Series Model Descriptions
All manufacturers' names, numbers, symbols and
descriptions are for reference only. It is not implied that any part is the
product of the manufacturer. Caterpillar® and Cat® are registered trademarks
of Caterpillar, Inc., Cummins® is a registered trademark of Cummins Engine
Company, International/ Navistar® is a registered trademark of Navistar
International Transportation Corporation, Detroit Diesel® is a registered
trademark of Detroit Diesel Corporation, Ford® is a registered trademark of
Ford Motor Company, Waukesha® is a registered trademark of Waukesha Engine
Division of Dresser.
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