Fiat 1116 CC Automobile User Manual


 
Engine idles roughly
Mixture too weak
Air leak in carburettor
Air leak at inlet manifold to cylinder head, or inlet manifold to
carburettor
Carburettor incorrectly adjusted
Other fuel system fault (see Chapter 3)
Low tension leads on coil loose
Low tension lead to distributor loose
Dirty, incorrectly set, or pitted contact breaker points
Tracking across inside of distributor cover
Faulty coil
Ignition leads loose
Spark plugs fouled or incorrectly gapped.
Ignition timing incorrect
Other ignition fault (see Chapter 4)
Incorrect valve clearances
Widely differing cylinder compressions
Low battery voltage (charging fault)
Battery leads loose on terminals
Battery earth strap loose on body attachment point
Engine earth lead loose
Pre-ignition (pinking) during acceleration
Incorrect grade of fuel being used
Ignition timing over-advanced
Other ignition fault (see Chapter 4)
Engine overheated
Excessive carbon build-up
Fuel system fault (see Chapter 3)
Valve timing incorrect (after rebuild)
Mixture too weak
Engine runs on after switching off
Idle speed too high
Incorrect type of spark plug
Overheating
Excessive carbon build-up
Other emission control fault (see Chapter 3)
Oil being lost due to leaks
Leaking oil filter gasket
Leaking rocker cover gasket
Leaking timing gear cover gasket
Leaking sump gasket
Loose sump plug
Low oil pressure (verify accuracy of sender before
dismantling engine!)
Oil level low
Engine overheating
Incorrect grade of oil in use
Oil filter clogged or bypass valve stuck
Pressure relief valve stuck or defective
Oil pick-up strainer clogged or loose
Main or big-end bearings worn
Oil pump worn or mountings loose
Excessive oil consumption
Overfilling
Leaking gaskets or drain plug washer
Valve stem oil seals worn, damaged or missing after rebuild
Valve stems and/or guides worn
Piston rings and/or bores worn
Piston oil return holes clogged
Oil contaminated with water
Excessive cold running
Leaking head gasket
Cracked block or head
Oil contaminated with fuel
Excessive use of choke
Worn piston rings and/or bores
Unusual mechanical noises
Unintentional mechanical contact (eg fan blade)
Worn drivebelt
Worn valvegear (tapping noises from top of engine) or incorrect
clearance
Peripheral component fault (generator, coolant pump)
Worn big-end bearings (regular heavy knocking, perhaps less under
load)
Worn main bearings (rumbling and knocking, perhaps worsening
under load)
Small-end bushes or gudgeon pins worn (light metallic tapping)
Piston slap (most noticeable when engine cold)
Worn timing chain and gears (rattling from front of engine)
Worn crankshaft (knocking, rumbling and vibration)
1•36 All engines