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Intake valves making contact with spark plug
#1
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Retired
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Greetings,
We noticed on our 1936 Business Coupe 8 cylinder that in two of the cylinders the gap on the spark plugs are completely closed due to making contact with the intake valves. After pulling the plugs we can see the contact points on the valves and plugs.
Any thoughts or suggestions?

Posted on: 10/15 19:59
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Re: Intake valves making contact with spark plug
#2
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BigKev
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Are you using the right plugs? Perhaps they are too long of a reach.

Posted on: 10/15 20:05
-BigKev


1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog

1937 Packard 115-C Convertible Coupe -> Registry | Project Blog
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Re: Intake valves making contact with spark plug
#3
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Ross
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This not too unusual if the head has been heavily milled in the past. If your plugs are correct then the simplest expedient is to use an extra copper washer under each plug to lift them up a bit.

Posted on: 10/15 20:39
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Re: Intake valves making contact with spark plug
#4
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TxGoat
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Could be weak valve springs... wrong valves.... thin head... wrong plugs or old plug gaskets.

Posted on: 10/15 20:46
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Re: Intake valves making contact with spark plug
#5
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Retired
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All sounds logical and like great advice.
I have a shop manual for 1937-38. I assume the 8cyl. would be the same in the 36.
The manual calls for champion Y-4’s, there are currently J-8’s in the engine. I know the numbers pertains to the heat range,
What does the letter refer to?
Thanks

Posted on: 10/15 22:01
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Re: Intake valves making contact with spark plug
#6
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su8overdrive
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Have used nothing but 10mm AC M8 sparkplugs in my Packards since the late '70s. Luckily for us, they seem to be the right heat range. They're probably still available at NAPA, etc. because so many old Chevy cars and pick ups in Mexico, Latin and South America. They also fit 1936-on Cadillac, '37-on LaSalle, Buicks.

Posted on: 10/15 22:08
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Re: Intake valves making contact with spark plug
#7
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BigKev
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Nearly all the shop manuals are in the Literature Archive here on the website.

Posted on: 10/16 6:47
-BigKev


1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog

1937 Packard 115-C Convertible Coupe -> Registry | Project Blog
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Re: Intake valves making contact with spark plug
#8
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flackmaster
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J8 is a 14mm plug which tells me you have a later head. No drama, shouldn't be an issue. Had same on my 998...try doubling up in the spark plug washers and see if that resolves??.

Posted on: 10/16 16:33
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