Piper Navajo PA-31 Service Manual page 930

425
1.50
.38
-- I
-- I
PIPER NAVAJO SERVICE MANUAL
1. SPARK PLUG
2. SEATING SURFACE
3. COMBUSTION
TUBE ASSEMBLY
4. GROUND ELECTRODE
5. JACKET ASSEMBLY
6. COMBUSTION
HEAD ASSEMBLY
7. MEASURE
8. GASKET
7
6
4
447
6.00
SLIP FIT (.255
DIA. HOLE
I
UNDER CUT.010
MARK WITH
BLACK PAINT
18 MM THREAD
STOCK
3.444
MATERIAL CAN BE SAE TYPE 303,321 OR 347 ST. ST. OR ALUMINUM - CASE HARDENED
Figure 13-20. Spark Plug Gap Adjustment and Tool (B39D59, D39D59 Heater)
Reissued: 10/12/79
HEATING AND VENTILATING SYSTEM
5B24