EMA - 14 ENGINE MECHANICAL SYSTEM
Sympto
m
Suspec
tarea
Remedy
Low oil pressure. Repair or replace as required.
Broken
valve spring.
Replac
ethevalvespring.
Worn or dir ty valve lifters. Replace the valve lifters.
Stret
ched or broken timing chain and/or
damag
ed sprocket teeth.
Repla
ce the timing chain a nd sprockets.
Worn timing chain tensioner, if
applicable.
Replace the timing chain tensioner
as required.
Worn c
amshaft lobes.
• Inspe
ct the camshaft lobes.
• Repla
ce the timing camshaft and
valve
lifters as required.
Worn valve guides or valve stems. Inspect the valves and valve guides,then
repair as required.
Stuc
k valves. (Carbon on the valve
stem
or valve seat may cause the
valv
etostayopen.
Insp
ect the valves and valve guides,
then
repair as required.
Upper engine noise,regard-
less of engine speed.
Worn drive belt, id ler, tensioner
and bearing.
Replace as required.
Low
oil pressure.
Rep
air or required.
Loose or damaged drive plate. Repair or replace the drive plate.
Dam
aged oil pan, contacting the
oil
pump screen.
• Ins
pect the oil pan.
• Ins
pect the o il pump screen .
• Rep
air or replace as required.
Oil pump screen loose, damaged
or restricted .
• Inspect the oil pump screen.
• Repair or replace as required.
Exc
essive piston-to-cylinder bore
cle
arance.
• Ins
pect the piston, pis ton pin
and
cylinder bore.
• Rep
air as required.
Excessive piston pin-to - piston
clearance.
• Inspect the piston, piston pin and
the connecting rod.
• Repair or replace as required.
Exc
essive connecting rod bearing
cl
earance
Ins
pect the following components
an
d repair as required.
• The
connecting rod bearings.
• The
connecting rods.
• The
crankshaft pin jour nals.
Excessive crankshaft bearing clearance. Inspect the fo llowing components,
and repair as required.
• The crankshaft bear ings.
• The crankshaft main jour nals.
• The cylinder block.
Low
er engine noise,regard-
les
s of engine speed.
Inc
orrect piston, piston pin and
con
necting rod installation
• Ver
ify the piston pins and connecting
rod
s are installed correctly.
• Rep
air as required.
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