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'74 SPICA Spider
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Discussion Starter #1
Hi Alfisti,
I've recently acquired a very nice '74 Spider with original SPICA and lots of valve clatter. I checked the valve clearances
Intake Exhaust
1 .021 .021+
2 .019 .023
3 .020+ .025+
4 .019 .023
I've attached a picture of the plugs, 1 - 4 right to left showing the buildup on #3 and to a lesser degree on #2
Compression is good 150, 155, 150, 150
Lots of oily grime inside the center of the air cleaner housing - possibly from the original (non-functional) oil separator and lots of blow-by or valve guide seep from a worn engine.
My questions:
1. Is the large gap on exhaust valve 3 due to carbon buildup or just some other reason?
2. how should I proceed to quite the valve clatter
Many thanks



0165211203610341e4507f604e91c2b803714df142.jpg
 

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Premium Member
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1,965 Posts
I have an 87 so I can't speak with and abundance of confidence about your vintage. Assuming clearances are spec'd the same (which you'd need to verify)... intakes are supposed to be 0.016" - 0.018" and exhausts 0.018" - 0.020" so they are all too big and need to be adjusted.

Are you familiar with how to adjust them? If not, there must be a DIY or two somewhere on the AlfaBB.
 

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Adjust the valves, fit a new set of plugs and drive it hard, Oil burning motors need to be driven until they are at full temperature. Idling and driving slowly will foul the plugs. If you are unable to drive it hard then fit hotter spark plugs such as NGK BPR6ES
 
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