Oil Specification; Temperature And Oil Viscosity Chart; Change Engine Oil (100 Hours) - Hobart JET-EX 4 Operation And Maintenance Manual

OM-2049

(2) Oil specification

Engine lubricating oil recommended by the engine manufacturer must meet Ford Specification
No. ESE-M2C101-C. Oil that meets this specification is normally marked so on the can and
meets API (American Petroleum Institute) classification designation SF or SG. The manufacturer
recommends Ford or Motorcraft oils, which meet all specifications for Ford Industrial Engines.
(3) Oil viscosity
When you change or add oil, you should select oil with the proper specifications and with the vis-
cosity, selected from the following table, which most closely matches temperature range you ex-
pect to encounter for the next 100 hours of operation.
SINGLE VISCOSITY OILS
When Outside
Temperature is
Consistently
-10F to +32F
+10F to +60F
+32F to +90F
Above 60F

(4) Change engine oil (100 hours)

Oil should be changed after each 100 hours of engine operation. The generator set is equipped
with an hourmeter which records actual engine operating time. The ideal time to change oil is
soon after a power delivery run when the engine is at operating temperature.
NOTE: If lubricating oil is drained immediately after the unit has been run for some time, most of the
sediment will be in suspension and oil will drain readily without clinging to internal surfaces.
CAUTION: DO NOT USE SOLVENTS AS FLUSHING OILS IN RUNNING ENGINES.
Change the oil filter each time the oil is changed.
Change oil as follows:
(a) Provide a container for catching used oil. Capacity should be greater than 2 gallons.
(b) Remove drain plug located in oil pan. Allow sufficient time for oil to drain from valve train, tim-
ing gear case, etc., before reinstalling plug.
(c) Change oil filter while oil is draining [see Para. 2, E, (5) below].
(d) Clean drain plug and reinstall. Do not over-tighten.
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Page 4
Use SAE
Viscosity
Number
(*) 10W
20W-20
30
40
(*) Where sustained high RPM operation is anticipated, use 20W20.

Temperature and Oil Viscosity Chart

MULTI-VISCOSITY OILS
When Outside
Temperature is
Consistently
Below +32F
-10F to +90F
-10F to +90F (or above ) 10W-40
Above +10F
Figure 4
Use SAE
Viscosity
Number
(*) 5W-30
10W-30
20W-40
May 20/89