Detroit Diesel — Timing Fuel Injector
Adjustments
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Do not turn the engine in a left-hand direction with a wrench on the crankshaft bolt or camshaft nut at the front of the engine.
Procedure
- Place speed control lever in idle speed position; secure stop lever in no-fuel position if provided.
- Rotate crankshaft with starting motor or barring tool J 22582 until exhaust valves are fully depressed on cylinder to be timed.
- Place small end of injector timing gage in hole in top of injector body, with flat of gage toward injector follower.
- Loosen exhaust valve rocker arm push rod lock nut.
- Turn push rod to adjust injector rocker arm until extended part of gage just passes over top of injector follower.
- Hold push rod and tighten lock nut; check adjustment and readjust if necessary.
- Time the remaining injectors in the same manner.
- If no further tune-up required, use new gaskets and install valve rocker covers.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1.460 in gage (J 1853) standard camshaft timing
- 1.484 in gage (J 1242) advanced camshaft timing
Source: Detroit Diesel 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.