what would cause this??

http://ferrarichat.com/forum/showthread.php?t=306018 Post 14

Per my advise there, The inner bearing on the belt drive gear shaft.

 

Dave, is that a fence failure?

Very ugly.

 

Just read the op's original post in the 348 forum... I don't get it, did he not remove the t-belt inspection covers to reveal this damage until now? Just surprised because he obviously got pretty deep already with the bottom cover removal...

If this is the case then Dave's advise (#14) had uncanny timing. No pun.

Best to the op.

 

Considering how narrow the belt is worn down to... I would consider that the ultimate Fence Success! They contained the belt and kept the cams turning long enough to give warning signs something was a miss. This is an inner bearing failure that was ignored a LONG time, we could all hope for that much of a warning.

There is a post in the 348/355 section of this engine showing the oil pump tensioner in a bad way, stating the noise has been found. Which noise?!

Someone is living right as there are MANY warning signs (read flashing neon red banners) that were ignored to get it to this point! The fact it still has 32 straight valves and no extra ventilation holes in the block or front cover is nothing short of a miracal.

Not "Very Ugly" but Exceptionally Lucky, the OP should buy up every lotto ticket he can find right now! This is the type of warning I hope to get with the fences welded where they dont break off and shread the belt. The last one this lucky that I took apart had two narrow belts turning the cams from fence shards cutting the belt in half.

Noises cant be ignored and quick fix repairs only work on Fiats and Toyota's.

 

Okay this really is incredible.

 

As I suggested in your previous thread the timing belt drive pulley is running crooked due to a bearing failure.

http://ferrarichat.com/forum/showpost.php?p=140107248&postcount=9

I suspect that your bearing is significantly worse than the one pictured here.
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geeze threads like this are scary stuff. So glad you guys saved him though!

 

I thought I remembered reading your history with this car. After a review...

I think the "Genius" that did this work should review your photo's and be asked to comment to you privately on the matter. When you pay real money to have a Pro work on a car they are expected to have product knowledge. It might be perfectly explainable but it didnt sound like you held him under a tight budget.

The upside... you still have an intact, vent free engine to fix up.

 

The same exact bearing went out on my 348 this year. The part is about $400. Luckily, I caught it in time. The loose bearing made the belt rub against the housing. I changed it during my 30K.

 

sad thing is that lets say you use this mechanic regular. Car will go boom and he gets more work you pay for just because he made a mistake. Automechanics pays more to the incompetent than the competent.

That bearing is a known problem area in these cars being discussed here on fchat many many years back.

 

Exactly the same direction is out on my 348 this year. The part is about $ 400. Fortunately I took it on time. The mobile bearing does the friction belt against the house. I changed into my 30K.

 

Definitely a problem there. How long ago was that work done?

The drive sprocket (in the bottom of your photo) has probably got the bad bearing.

 

I think it definitely contrubuted to it. Especially how the belt walked over the front of the fence. The bracket the idler gets pressed into will flex if it isn't bolted in all the way. The bolt holds the bracket to the front of the block, which is behind the back of the belt cover. When you go to pull the idler bearing out, slide a long socket into the hole of the bearing, then used the socket as a fulcrum for pulling the bearing off. Otherwise you can snap the bracket. Been there done that.

 

Many gizmo's out there to check misalignment problems...

http://www.easylaser.com/Belt%20Alignment.htm

 

Unfortunatly many shops and technicians feel forced into having the cheapest 30k service price in town. Those of us who do alot of these have started seeing this concern on cars in recent years. I have also started seeing this occur on the drive gears for the 355 and the 12 cylinders. Carefull attention must be made to these during inspections and services. This obviously makes a significant difference in a 30k service price. When comparing service prices ensure you do your homework and compare apples to apples. If a shop is preparing you for items like this and include it in your estimate they would be a shop I would consider over one that does not. I would rather prepare a client for the unexpected possibilities we may encounter before hand then surprising them with it half way through the job.

 

Old proverb: "He who have cheap 30K service get what he pay for."

 

If you have torn it down this far already why would you need to pay for the major? Just finish it yourself.

 

Lol

I've heard of starting quotes at $6000+.

 

A lot depends on the warranty you give yourself, whether you're a good client, whether you're going to whine about how long it takes, demand extra services for free, and badmouth yourself afterward!

Congrats for wading in with both feet!