Re: [alfa] Piston Slap

[bearbvd@xxxxxxxxxxxxxx (Greg Hermann)]

At 11:02 AM 9/29/03, Daegrigg (Don) wrote:
>John,

Why oh why do I suspect that the noise is timing chain slap ??

Greg
>
>Are you sure you have piston slap.   Piston slap (per dic. of auto terms) is
>the condition caused by too much clearance between the piston and the
>cylinder walls. The piston rattles or slaps against the wall of the
>cylinder. It makes a hollow, muffled, bell-like sound.  Is this what you
>have?
>
>PS should cause accelerated wear on the liner and possibly scuffing on the
>piston skirt.  Oil blow-by the oil control ring may cause increased
>consumption/burning.  What is your #1 spark plug indicating?
>
>PS is not terminal but it is a chronic condition that will not get better.
>I would seek another opinion/diagnosis.
>
>Don
>
>----- Original Message -----
>From: John Cecil <jcecil@domain.elided>
>To: <alfa-digest@domain.elided>
>Sent: Sunday, September 28, 2003 5:28 PM
>Subject: [alfa] Piston Slap
>
>
>> Fellow and esteemed Digesti-
>>
>> I have a '87 Spider Veloce which has been diagnosed as having piston slap
>in
>> the #1 cylinder. The engine has only about 25,000 mi., It uses almost no
>> oil, has normal power but makes a tapping noise which goes away when the
>#1
>> plug is removed. My opinion is that the liner is abnormally worn, but I
>have
>> no idea why as the engine has never overheated nor run with low oil (Mobil
>1
>> 15W50). Oil pressure is over 60psi at 2500rpm and registers even when hot
>at
>> idle (does not read zero, but actual value is hard to tell from the gage).
>> Also, there is no smoke at all from the exhaust.  My question is this: Is
>> there any potential for catastrophic failure if I just go ahead and drive
>it
>> and ignore the noise? Also, has any one ever heard of a problem like this
>on
>> such a low milage engine?
>>
>> --
>> John Cecil
>> <jcecil@domain.elided>
>> <jcecil66@domain.elided>
>> --
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