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Followup To
Question -
I recently had my engine overhauled. I have replaced the muffler the fan and have placed an anti-sway kit on the car. However, recently after a week of having the work done. The car is making this rattle sound at low RPM's and only when the engine has warmed up completely. The sound is very loud and continues when I'm in shifting from first to second gear and second to third. The sound appears to be coming from the left front end of the car. I'm just afraid that it could be something major. However, I have taken the car to several mechanics and each of them have been able to diagnose the problem. I live in Kansas and we don't have very many if any qualified Alfa Mechanics.
Answer -
I need more information:
Who did the overhaul and were the rod ends made round again.
At what rpm does the noise appear and disappear.
If you take off the auxillary belt (fan belt) does the sound go away.
Yes, the rods were made round again.
It is variable more noticeable right when you take off and right when you shut off the engine. I would say the 2000 to 3000 range. Higher than that the sound is no longer visable however the vibration is still exhibited. The vibration makes the car sound like it is still running hard even though you are barely moving.
To tell you the truth I did not remove the fan belt. But another thing that happens is the exhaust spews out this blackish goo only in small amounts. The engine has a vibration that coincides with the noise. Sorry I couldn't answer more in depth. The sound is equal to loose muffler sound except it comes from the front of the car. This rattle poping sound of metal grinding is very noticable when you shut off the car. The clutch does not seem really change anything when it is depressed or engaged.
AnswerThe first thing that comes to mind is loose valve guides.
Pull the valve cover and push on a valve spring sideways--if it moves the guide is too loose.
Or install a vacuum gauge on the intake manifold--if it vibrates around a set value that too indicates loose valve guides.
Do remove the auxillary belt and also see what happens.
Giving advice on noises at a distance is always dicey.
