Toyota 3R-B 1969, Repair Manual

Page: 32 / 193

E N G I N E - Tr ou bl e Shooting 3-5
b. P o o r compression
c. L e a k y cylinder head gasket
d . L e a k y manifold gaskets
N oisy Engine
Overhaul and re p a ir engine
Replace gasket
Tighten manifold o r re p la ce gaskets
One of the most difficult of all trouble shooting operation is to locate the so u rce
of noise in the engine. E v e r y rotating o r reciprocating p a rtis a potential sou rce
of n o is e .
Certain noises possess characteristics which can be detected. T h e s e ch aracter-
: 'tries v a r y , and experience is the best guide in most c a s e s .
'rankshaft bearing
a. Worn bearings
b. Worn crankshaft journals
c . Melted crankshaft bearings
R ep lace bearings o r grind crankshaft
Grind o r re p la ce crankshaft
Replace bearings and check lubricat­
ing system
2. Connecting rod & connecting rod bearings
a. Worn connecting rod bearings
b. Worn crankpin journals
c. Bent connecting rod
d . Melted bearings
e . Worn connecting rod bushing
3. Piston, piston pin & piston rings
a. E x c e s s iv e cylinder w e a r
b . Worn piston o r piston pin
c. Burnt piston
d . Defective piston rings
4. Other components
a. E x c e s s iv e camshaft thrust
clearance
b . Worn crankshaft thrust w a sh e r
c . Worn timing ge a r
d. Worn valve lifters
e . E x c e s s iv e valve clearance
R eplace bearings o r grind crankshaft
Grind o r replace crankshaft
C o r r e c t o r replace connecting rod
R ep lace bearings and check lubricat­
ing system
R ep lace bushing
B o r e and hone c y lin d e rs , and install
new pistons and rings
R ep lac e piston and pin
R eplace piston
R ep lace rings
R ep lac e camshaft thrust plate
R ep lace thrust w a s h e r
R ep lac e timing g e a r
R ep lace va lve lifters
Adjust clearance