TECHNICAL DATA-B.12 Static Timing Position The static timing position varies according to application, but can be obtained by referring to the first group of letters and digits of the fuel pump setting code (stamped on the fuel pump identification plate). IOn the latest 4.108 engines the setting codes start with the fuel pump part number followed by the two code letters. Only the Itwo code letters are used in the table for identification purposes.
First Group of Engine Checking Fuel Pump Marking Static Timing Piston Displacement Fuel Pump Code Angle (Degrees) Angle (Degrees) (Degrees) BTDC in (mm) BTDC (USING TIMING TOOL MS67B) ALTERNATIVE DROP VALVE METHOD 4.99 AH28 282 29S 26 0.226 (5,74) BH26 287 300 26 0.226 (5,74) CH3S 280~ 290 19 0.120 (3,05) DH19 287 300 26 0.226 (5,74) LH20 } 282 292 20 0.134 (3,40) LH26 LH29 281 292 22 0.160 (4,06) MH26 281 290 18 0.110 (2,79) 4.107 CH3S 280~ 290 19 LH23} 0.120 (3,05) LH28 282 292 20 LH29 0.134 (3,40) LH31 (exceptions below) LH31 1900/2/2770 } LH31 1900/2/3130 281 292 22 0.160 (4,06) LH31 1900/9/1880 MH27} PH28 281 290 18 0.110 (2,79) PH30 PH34 280 290 20 0.134 (3,40) EH34E 281 290 18 0.11 ° (2,79) EH39 LH30 281 292 22 0.160 (4,06) IpH 281 290 18 0.1 0 (2,79) PH23E (exceptions 281 290 18 0.110 (2,79) PH25E below) PH2SESOO/S/24S0} PH2SESOO/9/1990 279~ 290 21 0.150 (3,81) PH2SESOO/9/2090 iEH 4.108 PH27 ~ - 281 290 18 '0.110 (2,79) i PH28 (exceptions PH30 be/ow) PH30/S00/5/24SO } PH30/S00/6/1S70 279t 290 21 0.150 (3,81) PH30/S00/9/1990 PH30/S00/9/2090 :RH 1 RH30E 279~ 290 21 0.150 (3,81) SH33E ITH } 281 291 20 0.134 (3,40) ITH23E .
Note: For 4.107 and 4.99 mechanically governed engines r aled above 3,000 and 2,SOO rev I min respectively, the static timing is altered to 22' B.T.C.D.' piston displacement 0.160 in (4,06 mmJ. For 4.108 engines prior to engine numbers 108U15973 and 108UD20214, the static timing was 19' B.T.D.C.·, piston displacement 0.120 in (3,05 mm). When re, setting these pumps, it is advisable to set at the figures quoted in above table. For 4.107 industrial engines having a fuel pump coding of PH30 and an idling speed at 1,000 rev/min, the static timing is 21' B.T.D.C. and a piston displacement of 0.147 in (3,73 mm).