Maintenance - Lehman SP90 Owner's Manual

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Maintenance

The importance of correct lubrication, periodic inspection and adjustment cannot be over-emphasized. On it will
depend, to a very large extent, the service which your engine will deliver.
The heat exchanger of your engine is protected by a "zinc pencil" which should be inspected and replaced periodically
as required. As the rate of electrolysis varies greatly in different areas, only experience will dictate how often
inspections should be made.
For convenience lubrication and maintenance work has been divided into the following periods;
A Daily
B After every 50 hours running.
C After every 200 hours running.
D After every 1200 hours running.
Summary of Regular Maintenance
. .
. . .
Daily.
After first 50 hours of operation.
Every 200 hours of operation.
Every 1200 hours of operation.
Every 1500 hours of operation.
Every 3000 hours of operation.
Every 3600 hours of operation.
*Zinc pencil should be checked every 2 weeks, regardless of number of operating hours until owner determines
how often zinc element must be replaced. Replace after 50% deterioration.
Injectors need not be serviced at regular intervals but rather, should be serviced after problem such as smoke, loss
of power, hard starting, etc. develops and has been diagnosed.
Minor Repairs, Maintenance and Adjustments
DUE TO REVISED HEAD GASKET, HEAD GASKET AND HEAD BOLT DESIGN RETORQUING OF CYLINDER
HEAD IS NOT REQUIRED. AND MUST NOT BE ATTEMPTED.
TO ADJUST VALVE CLEARANCES: (Note
temperature). Following removal or rocker arm cover and tightening cylinder head bolts as described above, actuate
the engine stop control lever so engine will not start and revolve crankshaft pulley, until numbers
(on cylinder, see specification section) or number 1 and 4 (on 6 cylinder, see specification section) are opened
4
by their respective rocker arms.
Insert the correct thickness feeler gauge (as shown in the following table) between the valve stem cap and rocker
arm of No. 3 inlet valve (on 4 cylinder) or No 9 exhaust valve (on 6 cylinder) as shown in figure 25. Turn the valve
clearance adjusting screw Fig. 18 until the feeler blade is lightly caught between the rocker arm and valve stem
cap, but so that the blade can still be removed with light resistance.
Select the appropriate feeler blade and repeat the procedure for No. 8 exhaust valve (on
exhaust valve (on 6 cylinder) models.
E After every 1500 hours running.
F After every 3000 hours running.
G After every 3600 hours running.
Check engine and transmission oil levels.
Check cooling water level.
Check belt tension and adjust if required.
. .
. .
Change Engine Oil and filter.
Check (exchanger) zinc pencil.*
Check for fuel, lube oil or coolant leaks.
Check all wiring connections, cables, etc.
Check valve clearances, adjust if required.
.
. . .
Change Engine Oil & Filter. And Transmission Oil.
Check idling speed, adjust if required.
Check exhaust components for leaks.
Check condition of all coolant and oil hoses.
Check all engine mount bolts.
Replace raw water pump impellor.
. . . .
Flush cooling system.
Replace anti-freeze.
. . . .
Check end play of turbocharger rotating assembly.
. . . .
Remove and dismantle turbocharger
. .
. .
Replace thermostats.
. .
.
Adjustments should be made while engine is at normal operating
-
repair as required.
and 6 valves
1
cylinder) or No. 12
4