Engine Noise

I’d start looking here:
https://www.ferrarichat.com/forum/search/56854879/?q=Noise&o=relevance&c%5Btitle_only%5D=1&c%5Bnode%5D=93

I think my QV has too much engine noise at high revs too and think I need a valve adjustment. My 2 valve only gave me intake and exhaust noise in the upper revs.

Or to be a wise guy, get a louder exhaust.

 

Put a compression test on the engine before you start taking it to bits

 

My 1990 Mondial t had a tapping sound after a major engine-out a year ago. The shop did a valve adjustment before I took it home and they silenced the tapping.
I have as not had any unusual engine noises since.

 

The engine was back in (after the major engine-out) when the tapping was heard. The valves were adjusted with the engine in. Yes, from the top.

 

Seriously i cant resist to comment on this, where are you guys having this cars serviced ?? valve train noise after a major service unbelievable makes me wondering hows working on this cars.

 

OK, ok. Just in case: My ‘83 QV Cab began a serious tapping noise a few years ago. Sounded metallic and drove me nuts! Found a thread here somewhere and talked to Dave Helms about it. Unbelievably, one of the very accessible belts was snapping due to temperature or prolonged sitting. It was easily fixed. If you didn’t know this - now you do! SG


Sent from my iPhone using FerrariChat

 

Yes, it’s a terrifying sound. Like a clap of lightning over and over until the belt stops making the noise.
To diagnose, you can spray a small amount of belt dressing on the Accessory belt and start the car. If the noise stops, you know the problem.



Sent from my iPad using FerrariChat.com mobile app

 

I had the same dreaded belt noise. Sounded like gravel in a blender. Easy to fix.

 

Reviving this conversation as my car is now doing the same thing. Cold winter weather start after sitting for a couple of weeks. Getting the "ominous" metallic tapping sound. Definitely seems to be in the area of the belts, but no idea which one. After the car idles for 3-5 minutes, the sound goes away. The car drives fine with no other weird noises. My car had belts adjusted back in December and I've driven it sparingly since.

What is the recommended type of adjustment or treatment for the belt(s)? I'm not mechanically inclined but sense this may be a DIY project I can handle.

Image Unavailable, Please Login

 

If nothing seems obviously wrong visually, I'd start with applying some spray V-belt dressing to the V-belts and see how long it keeps the cold-start-up noise away (you should be able to do this without needing to disassemble anything by spraying into a pulley-belt tangency location at idle). You can't use a V-belt dressing daily/weekly, but applying it every 3~6 months would be no sin IMO.

 

Great advice Steve as always.
I had the same problem. It turned out to be the AC belt. I had it replaced and it’s been fine since.


Sent from my iPad using FerrariChat.com mobile app

 

Horrible stuff belt dressing, banned where i used to work.

 

Good for you -- I'm sure you worked on many engines that used plastic V-belts on a badly-designed, way-too-low-wrap-angle idler pulley, large V-angle pulley belt paths. Bless your heart...

 

Encourages bad engineering, some at work saw it as a way to avoid the job of changing the belts. Mind you these were a lot bigger on industrial units.

 

And completely different in design -- using belt dressing to solve a problem on a rubber V-belt with a 6 deg pulley groove angle with a well-designed belt path is probably a bad idea just masking a real problem (as a 6 deg angle V-belt virtually self-locks into the pulley and never slips or moves vertically relative to the pulley). A plastic V-belt with a 60-deg pulley groove on the poorly-designed 308/Mondial AC belt path is a completely different animal (more like a flat belt). But feel free to keep applying your unrelated experience to every other different belt design.

 

Being retired i dont need to- its great letting others have the hassle these days

 

I've had my accessory belts all changed within the last 3 years. Is there a recommended changing interval based on time/mileage for those?

 

The belts should be checked for tension after the first year from change, they will have loosened up a bit. Most would change at the time of a timing belt service, usually every 5 years would be a typical interval for that. The ac belt does have that plastic spine inside, and can crackle and tick especially at cold start after only a year or two. Proper tensioning the belt would help solve for this.

Sent from my BBF100-2 using FerrariChat.com mobile app