Specifications

MAINTENANCE
53
550 Gas/LPG 330650 (2--05)
PCV SYSTEM
Check the PCV system after every 200 hours of
operation. Check all connections. They are to be
airtight. To service the syst em, clean the PCV
valve and the air inlet. Check all hoses for wear or
plugging.
TUNE-UP CHART -- CONTINENTAL ENGINES
(For machines below serial number 006409)
Idle speed, no load
600 + 50 rpm
Maximum governed
speed
2400 + 50 rpm
Spark plug gap 0.035 in (0.9 mm)
T iming, gasoline 15_ BTDC @ 1850
rpm
T iming, LPG 18_ BTDC @ 1850
rpm
Firing order 1--3-- 4--2
Valve clearances, warm intake 0.014 in
(0.36 mm)
exhaust 0.018 in
(0.46 mm)
TUNE-UP CHART -- GM ENGINES
(For machines serial number 006409 and
above)
Idle speed, no load (For
machines serial number
006409--007005)
1350 + 50 rpm
Idle speed, no load (For
machines serial number
007006 and above)
950 + 50 rpm
Maximum governed
speed
2400 + 50 rpm
Spark plug gap 0.040 in (1.0 mm)
T iming, gasoline 0_ @ static
condition*
T iming, LPG 0_ @ static
condition*
Firing order 1--3-- 4--2
Valve clearance (Lash) 1/2 to 1 turn down
(
)
/
from 0 Lash
* ECU controls engine timing
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