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2.8 General Information GENERAL REFERENCE Standard Bolt Torque Specification Fuel / Oil Premix Ratios Formula: • 1 Gallon = 128 Ounces • 128 ÷ (Desired Ratio) = Ounces of oil for every 1 gallon of fuel. • 128 ÷ 20 (20:1 Ratio) = 6.4 ounces of oil for every 1 gallon of fuel . Always mix ratio in 5 gallon increments. Gasoline Volatility When gasoline is blended, it is given a Reid Vapor Pressure When the weather is very cold, gasoline must be able to vaporize If winter blend fuel is being used during the summer months, it B OL T S IZE T HREADS /I N
G RAD E 2 FT - LB (N- M ) G RAD E 5 FT - LB (N- M ) G RAD E 8 FT - LB (N- M ) 1/4 20 5 (7) 8 (11) 12 (16) 1/4 28 6 (8) 10 (14) 14 (19) 5/16 18 11 (15) 17 (23) 25 (35) 5/16 24 12 (16) 19 (26) 29 (40) 3/8 16 20 (27) 30 (40) 45 (62) 3/8 24 23 (32) 35 (48) 50 (69) 7/16 14 30 (40) 50 (69) 70 (97) 7/16 20 35 (48) 55 (76) 80 (110) 1/2 13 50 (69) 75 (104) 110 (152) 1/2 20 55 (76) 90 (124) 120 (166) FT - LB X 1.356 = N- M N- M X.7376 = FT - LB FUEL (G ALLONS ) 20:1 RATIO (O UNCES
OF O IL ) 32:1 RATIO (O UNCES
OF O IL ) 1 6.4 4 5 32 20 10 64 40 Grade 2 Grade 5 Grade 8 M AXIMUM R EID V APOR
A MBIENT A IR T EMP
R ANGE CLASS PRESSURE LOW HIGH A 7.0 psi (0.5 bar) 60°F (16°C) 110°F+ (43°C+) B 9.0 psi (0.6 bar) 50°F (10°C) 110°F (43°C) C 10.5psi (0.7 bar) 40°F (4°C) 97°F (36°C) D 12.0psi (0.8 bar) 30°F (-1°C) 85°F (29°C) E 13.5psi (0.9 bar) 20°F (-7°C) 69°F (21°C) Add 2.45°F for each 1000 ft (305m) above sea level |