Engine Tune-Up
Injector Timing Gage Chart (Needle Valve)
Timing
Camshaft
Timing
Injector
Gage
Timing
Dimension
Generator Sets
Standard
1.460"
J 1853
All
All Other Applications
*1.460"
*Standard
J
1853
71N5
J
1853
*Standard
*1.460"
N55
J
1853
*Standard
*1.460"
N60
Standard
1.460"
J
1853
N65 (white tag)
N65 Turbo -
J 1242
Standard
1.484"
(brown tag)
N 6 5 (N/A)
"Advanced
J
1242
**1.484"
(brown tog)
J
1853
1.460"
Advanced
HN65
J
1853
1.460"
Standard
N70 Turbo
Advanced
J
1853
1.460"
N70 N/A
J
1242
Advanced
1.484"
N75 N/A
J
1853
1.460"
Standard
N75 Turbo
J
1242
1.484"
Standard
N80 Turbo
**Advanced
J
1242
**1.484"
N80 N/A
J
1853
Standard
1.460"
N90
N/A-Naturally aspirated engines
*Use 1.484" timing gage (J1242) when engine has advanced
camshaft timing. Correct to standard camshaft timing and
1.460" injector timing at first opportunity to be consistent
with current production build.
Fig. 4 - Timing Fuel Injector
"Use 1.460" timing gage (J 1853) when engine has standard
7. Time the remaining injectors in the same manner as
camshaft timing. Correct to advanced camshaft timing and
1.484" injector timing at first opportunity.
outlined above.
NOTE: Advanced camshaft timing is indicated by "ADV-CAM-
8. If no further engine tune-up is required, use new
TIMING" stamped on lower right-hand side of option plate.
gaskets and install the valve rocker covers.
TABLE 1
6. Hold the push rod and tighten the lock nut. Check
the adjustment and, if necessary, readjust the push
rod.
Page 91
