engine noise

[emma]

hi we have air cooled 126 with a engine knocking noise could it be big end shell or noise timing chain

[Bar Vitelli]

Hi Emma, a trick I learnt was to take a hard stick of wood and put it against the engine with the other bit against your ear with the engine running.  This helps you locate the precise location of the noise without taking the engine apart. Then compare to the Haynes manual diagram and that will give you a really good clue as to which bit is causing the noise and needs a repair. Sounds daft but it does work! 

[gammakeith]

Big end knock is usually most noticeable when starting from cold and will get worse with increasing throttle (especially in the lower gears).  If it knocks at tickover and light throttle openings then it is likely to be something else.

Keith

[1973/126]

 Hi Emma. Do you have oil pressure, or does the light stay on?

 I would also try to disconnect the fan belt and run it like that, to see if it might be the fan making noise.