John Deere — Check Fuel Injection Pump Timing (Dynamic Timing)
Testing & diagnosis
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Stop engine prior to making timing adjustments; injection pump can seize if adjustment is made with engine running
Procedure
- Install timing sensor between No. 1 nozzle and high pressure fuel line; tighten to 30 N•m (22 lb-ft)
- Install magnetic probe with adapter to provide 0.65 mm (0.025 in.) air gap
- Connect timing sensor to meter socket SR and magnetic probe to socket MP
- Switch on meter and run engine 10 minutes to bring to operating temperature
- Press MAG PROBE key; enter 70% trig level, offset 0.0° then calibrate
- Run engine at fast idle then load down gradually to rated speed
- Record engine speed rpm and timing degrees
- Stop engine and rotate injection pump as required; recheck timing until specified timing obtained
- After adjustment grind the engine front plate mark to avoid confusion
Tools required
- FKM10429A (or JT07158) TIME-TRAC Amazon
- JDE81-4 or JDG1571 timing pin Amazon
- JDG793 or JDG821 magnetic probe adapter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1 mm offset on injection pump flange corresponds approximately to 2° on meter display
Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.