Mazda 121 Workshop Manual page 42

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B
TROUBLESHOOTING
GUIDE
Remedy
Ps9e
Insulticient compaession
Compresson leakage lrom valve seat
Weak or broken valve spfing
Faiied cylinder head gasket
Cracked or d'slorred cylinder heao
Sticking damaged, or wom plslon Ing
Cracked or wofi pislon
B-51
B -49
B-52
B-17
B-48
B-56
B-56
Mallunction ot luel system
Mallunction ot ignition system
Reler lo Secnon G
Othera
Slipping clutch
Dragg ng brakes
lklfunction of enginerelaled components
Siicking or burned valve
weak or broken valve spnng
Carbon accumulalon ln combustion chamb€r
B-49
B-52
itallunclion ol tuel system
lraltunction of lgnllion system
Engins nois€
Crsnkshaft- or bearing-rolated p.tls
Excessive rnain bearing oil clearance
Main bearing seized or heal damag€d
Excessive crankshait end Dlav
Excessive connecting rod bearing oii clearance
Connecting rod bearing seized or heat_damaged
B-64
B-58
B-65
B-65
B-58
PBton-related parls
Wom piston or pislon Pn
Damaged p ston rrng
8 5 5
8 5 6
8 5 6
8 5 6
valves or timing-related Parls
Broken valve sping
Excessve valve gude clearance
B-52
B -49
Malfunctlon of cooling system
Refor to Secton E
llralluncllon of tuel sFtem
others
lvlaLfunction
ol water pump bearing
lmproper drive beLl tenslon
Malfunction oi aternalor beanng
Exhaust gas leakage
N,4afunction
oi I ming beli tensioner
Befer to seci on E
Reler lo Section G
B-13
B-4

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