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This is even a problem on the early carb 308s as well, although I've never heard of catastrophic failure.
Outboard bearings don't have a dedicated supply of pressurized oil to keep them lubed, only the inboard pair. Outboard relies solely on splash lubrication.
When I did my first engine-out years ago, the engine had over 40K miles on it. Bearings rolled rough but true. As I heard/read, that was around the life-span of those. Duly replaced with the same type.
When I did the timing belt on my Mondial T this spring, I replaced the inboard needle bearing with the updated heavy-duty ball-bearing type. At least Ferrari was smart enough then to drill a tiny port in the shaft to deliver pressurized oil to that outboard
bearing.
Looks like that engineer had retired and was gone by the time when the 550/575 came out...
From: Ferrari <ferrari-bounces+dino308gt4=hotmail.com [at] ferrarilist.com> on behalf of Clarence Romero Jr. <clyderomerof4 [at] gmail.com>
Sent: September 28, 2024 2:55 PM
To: PeterGT4 <dino308gt4 [at] hotmail.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 575 down
Go to
Eurospares
Under 575 engine
Section 06
Timing Controls
Part #012
Control Timing Gear
This is what drives the belt
If the bearing on this fails
The belt fails
Do you get it now !
Clyde Romero
If you have no enemies
You have no character !
Scars are tattoos with better stories!
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you're out of F-4's you're out of fighters!
On Sep 28, 2024, at 1:43 PM, BRITT ROTHMAN via Ferrari <ferrari [at] ferrarilist.com> wrote:
What’s a ” drive cam”? I know what a tensioner is…..I know the bearing can seize or fail but…..drive cam?
Is that a part not normally changed on a belt service? Do you mean one of the entire camshafts on the drivers side can fail? Fail how?
Regards
Britt
On 28 Sep 2024, at 11:54, Anthony Bauco <tbauco [at] gmail.com> wrote:
Does this affect the 550 as well?
That can a source of failure as well on a TR
Never saw that on my 512 TR
But I drove mine a lot it had over 90k on the motor
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RF4-4EVR
Scars are Tattoos with better stories !
If you have no enemies, you have no character !
Clyde Romero
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Every time my ‘87 TR had it engine out belt service its OEM timing belt tensioner bearings displayed signs of lubricant leakage.
Sent from my iPhone
I am sorry to say there are no pictures to speak of
The drivers side tensioner or drive cam failed which caused a catastrophic failure of that head
It swallowed numerous valves into the intake
Which caused internal damage
This type of failure is well known with 550/575 engines when the drive cam fails
Sometimes you get a warning most times not
The car had a recent belt service with Hill bearings
It had 75506 miles on it
I would keep the car for parts but I am selling it
I have no regrets
I buy them to drive them!
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RF4-4EVR
Scars are Tattoos with better stories !
If you have no enemies, you have no character !
Clyde Romero
Confidentiality Notice: This e-mail ( including attachments ) is covered by the Electronic Communications Privacy Act, 18 U. S. C., Sections 2510-2521, and is intended only for the persons or entity to
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