308 '83 QV engine tapping noise - Ferrari Life
 
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post #1 of 14 Old 09-27-2013, 02:29 PM Thread Starter
 
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'83 QV engine tapping noise

Hi gents, I seemed to run into a problem with a 308 I recently purchased. I was doing some mixture adjustments and after a short drive the engine started making a loud tapping noise in sync with the valves. More like a valve knock noise. The belt service was done not too long ago, and i just changed the oil. I need to pinpoint exactly what it is so I know what to replace before I dive in and tear the engine apart. Any help would be appreciated

Last edited by SalernoPepey; 09-27-2013 at 02:43 PM.
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post #2 of 14 Old 09-27-2013, 02:43 PM
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Michael- When was the last times the valve clearances were adjusted? Maintenence schedule calls for it every 9000-15,000 miles, depending on whether Euro or US.

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post #3 of 14 Old 09-27-2013, 02:51 PM Thread Starter
 
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Originally Posted by tazandjan View Post
Michael- When was the last times the valve clearances were adjusted? Maintenence schedule calls for it every 9000-15,000 miles, depending on whether Euro or US.
US model 45K miles. I dont have any clue whether or not they were ever adjusted. I could go in and do the adjustment now to be sure, but is it really possible that it could start making a serious tapping noise out of the blue? Preignition maybe?
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post #4 of 14 Old 09-27-2013, 02:54 PM Thread Starter
 
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On second thought, I guess I'll need the tool... damn
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post #5 of 14 Old 09-27-2013, 09:43 PM
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Michael- The maintenance schedule for the US 83 QV shows 15,000 miles for inspecting and adjusting valve clearances. Where did you get 45,000 miles?

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Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

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post #6 of 14 Old 09-30-2013, 09:16 AM
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Those valves do not get loose from running, they get tight. Tight valves don't make noise.


If it is a US car it is very possibly a broken exhaust analyzer tube or even a failing header.

Last edited by Brian; 09-30-2013 at 10:15 AM.
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post #7 of 14 Old 09-30-2013, 11:05 AM
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Brian- Learn something new every day. So then the tendency would be towards burned valves from staying open?

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post #8 of 14 Old 09-30-2013, 11:14 AM
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Brian- Learn something new every day. So then the tendency would be towards burned valves from staying open?


Very common. It is internet lore that shimmed type valves require no adjustment.
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post #9 of 14 Old 09-30-2013, 11:19 AM
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Brian- Thanks. I know there are lots of mistakes in Ferrari tech data, but the owners manuals are pretty consistent on checking and adjusting valve clearances on the 2 and 4 valve engines with shim adjustable lifters.

Is there any reason to change out those shims at some point in an engine's life, since they are a wear surface?

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post #10 of 14 Old 09-30-2013, 02:20 PM
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Brian- Thanks. I know there are lots of mistakes in Ferrari tech data, but the owners manuals are pretty consistent on checking and adjusting valve clearances on the 2 and 4 valve engines with shim adjustable lifters.

Is there any reason to change out those shims at some point in an engine's life, since they are a wear surface?


246/Daytona/C4 earned a reputation for killing cams, especially the 246. Some guys I know (and pretty smart guys) felt it was best to change all the shims at the valve adjustment on those.


If you see wear there on any of the other cars it has a lubrication problem. The cams and shims are really well made on all the others.
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post #11 of 14 Old 09-30-2013, 03:01 PM
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Brian- Thanks.

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Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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post #12 of 14 Old 10-01-2013, 03:17 AM
 
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Dunno if this helps, had a bad tapping noise coming from LHS cylinder bank of my 96 F355, mechanic was adamant that the lifters have gone and needed replacing, however with a flush with some engine cleaner the noise disappeared and have not resurfaced, so perhaps try the Wurth engine cleaner product for a cycle before cracking it open may help.
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post #13 of 14 Old 10-01-2013, 09:10 AM
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Dunno if this helps, had a bad tapping noise coming from LHS cylinder bank of my 96 F355, mechanic was adamant that the lifters have gone and needed replacing, however with a flush with some engine cleaner the noise disappeared and have not resurfaced, so perhaps try the Wurth engine cleaner product for a cycle before cracking it open may help.

308's don't have hydraulic lifters.
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post #14 of 14 Old 05-03-2014, 04:07 AM
 
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Hi Michael,

Did you ever find out the cause of the tapping ?

I too have the same problem and have explored many options in my quest to resolve the issue but still on square one.

My issue sounds similar in the respect that I had just had a Major service a few months prior and
noticed a reasonably loud tapping noise when I pulled in for fuel. On the drive home it was very audible at idle but not really distinguishable at over 2000rpm. The tapping diminishes considerably when the engine if fully warm. I also observed that when started from stone cold there was not tapping for the first 1-0 seconds and then gradually it came back.

There is no apparent loss of performance and it idles smoothly.

I have thoroughly investigated and now eliminated :
V-belt sticking snapping in the pulleys
I have cut off the ac belt
Done the valve clearances (twice)
replaced a header / exhaust manifold on the bank that has the problem with tapping

Jut hoping you have solve the problem and can offer a suggestion ?

Cheers,

Steve
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