User Manual

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