tappets knocking sound, help please
hi i have a 89 gls xf ute 4.1 litre webber carby.
just as its been getting colder my engine is making a distinct noise when i start up as the engine warms up the noise gets less. i believe its the tappets.
now my mate says its my engine oil is too thick and that why its making the noise he says that the hydrolic lifters are sticking, i'm currently using penrite HPR 50 which has a viscosity of 40 - 70, could anyone please help with this problem.