TM 5-3805-281-24-2
Engine Rebuild, Break-In, and Tune-Up
PERFORM ENGINE BREAK-IN
Use a dynamometer to perform the following preliminary
break-in procedure. If necessary, preliminary engine
break-in can be performed without a dynamometer if
under controlled operating conditions.
IMPORTANT: DO NOT use PLUS-50 engine oil or
equivalents during break-in period of a
NEW engine OR one that has had a
major overhaul. PLUS-50 oil will not
allow an overhauled engine to properly
wear during this break-in period.
During break-in, periodically check
engine oil pressure and coolant
temperature. Also check for signs of
fuel, oil, or coolant leaks.
Fill engine crankcase with John Deere BREAK-IN OIL to
full level for use during the break-in operation. This oil is
specifically formulated to enhance break-in of John Deere
diesel engines regardless of ambient temperatures. Add
John Deere Break-in Oil only as needed to maintain the
specified oil level during break-in period. DO NOT add
makeup oil until the oil level is BELOW the ADD mark on
the dipstick. If more makeup oil is required during
break-in, an additional 100-hour break-in period is
required.
PRELIMINARY ENGINE BREAK-IN
AFTER MAJOR OVERHAUL
Time
Load
Engine Speed
5 minutes
No load
850 rpm
5 minutes
No load
1500--2000 rpm
5 minutes
1/4 load
1900--2100 rpm
10 Minutes
1/2 load
1900--2100 rpm
10 Minutes
1/2--3/4 Load
1900--2100 rpm
10 Minutes
3/4--Full Load
Rated Speed
Check and readjust valve clearance as necessary.
Cylinder head retorque is not required. (See Group 05,
Cylinder Head and Valves.)
PLUS-50 is a trademark of Deere & Company.
Continued on next page
RG,RG34710,1054
1923OCT971/2
