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Joined: Feb 2016
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2016
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Ciao.
I'm sorry for my bad english but I'm Italian.
I've got a Chevrolet AC of 1929 and I'm restoring it.
I'd like to know the spark plug's size and temperature.
My chevy's spark plug is 18 mm diameter and 13 mm long but cilinder's hole is 19 mm long.
Are my spark plug too short?
I hope I've been clear.
Thanks for the answers and saluti dall'Italia.
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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Welcome to Chevy Chatter! The correct modern spark plugs for your 1929 are AC-C87. The plugs are 18MM.   
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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ChatMaster - 7,000
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The 13 MM sounds about right. I have C86 plugs in my 32 and that is 12.87 MM .
Steve D
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ChatMaster - 4,000
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Running the recommended AC-C87 plugs in mine
AACA - VCCA - Stovebolt - ChevyTalk
Love the Antique Chevrolet's from 1928-1932
The Beauty, Simplicity, History, and the Stories they Tell
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Welcome to Chevy Chatter! The correct modern spark plugs for your 1929 are AC-C87. The plugs are 18MM. You can buy them from the Filling Station here in the USA online. Here is the link: www.fillingstation.comAll the Best, Chip
"It's wise to choose a SIX"
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: May 2012
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ChatMaster - 4,000
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ChatMaster - 4,000
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yeah, i picked mine up at O'Reillys
AACA - VCCA - Stovebolt - ChevyTalk
Love the Antique Chevrolet's from 1928-1932
The Beauty, Simplicity, History, and the Stories they Tell
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Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2016
Posts: 95 |
Hi!
Thank you all.
Ok 18 mm diameter.
But I did not undestend if there are problems putting a spark plug 12,7 mm long, in a cilinder hole 20 mm long.
Thanks again.
In Italy there is nobody to ask for it.
Saluti dall'Italia.
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2016
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Thank you again.
Saluti dall'Italia.
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Joined: Feb 2016
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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I unscrewed old spark plugs.
The second and the third are blighted.
The others are ok.
It is possible that the cylinder head gasket is burned?
I have a picture on my PC but I can not put it on post
Last edited by alfredodemo; 02/17/16 05:41 PM.
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ChatMaster - 2,000
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Ciao Alfredo --
è necessario effettuare alcuni test aggiuntivi. Il più importante è per testare la pressione di compressione di ciascun cilindro utilizzando la prova speciale indicatore. Se i cilindri numero due e tre hanno significativamente minore della pressione di compressione rispetto agli altri cilindri, le cause più probabili sono:
-- gravemente usurata o masterizzati di aspirazione o di valvole di scarico dei cilindri con una bassa pressione di compressione, o
-- guasti della guarnizione della testata dei cilindri con una bassa pressione di compressione.
-- i pistoni danneggiati o gli anelli in cilindri con bassa pressione di compressione.
Se tutti i cilindri hanno quasi la stessa pressione di compressione, poi ci possono essere alcune altre ragioni -- ma si dovrebbe provare il controllo di compressione prima. È possibile acquistare il tester di compressione tramite internet o nei negozi che vendono parti di automobili in Italia.
Buona fortuna a trovare il tuo problema. Cercheremo di aiutarvi se possiamo.
Tutti i migliori,
Chip
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Hello Alfredo --
You should make some additional tests. The most important one is to test the compression pressure of each cylinder using the special test gauge. If cylinders number two and three have significantly lower compression pressure than the other cylinders, the most likely causes are:
-- Badly worn or burned intake or exhaust valves in the cylinders with low compression pressure, or
-- failed head gasket in the cylinders with low compression pressure.
-- Damaged pistons or rings in the cylinders with low compression pressure.
If all cylinders have nearly the same compression pressure, then there may be some other reasons -- but you should try the compression check first. You can buy the compression tester via the internet or in the stores that sell car parts in Italy.
Good luck with finding your problem. We will try to help you if we can.
All the Best,
Chip
"It's wise to choose a SIX"
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Joined: Feb 2016
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Thank you.
I'll try test the compression pressure of each cylinder.
I will keep you informed.
Saluti dall'Italia.
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Shade Tree Mechanic
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Shade Tree Mechanic
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Last edited by Derek54; 02/21/16 05:42 PM.
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Grease Monkey
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Grease Monkey
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alfredo. I have atransmision from a 1930 chevy that's partialy disassembled. if you count the teeth and let ne know I would be willing to sell it to you and ship it.
farnerbarrett
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ChatMaster - 15,000
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I don't see any major problems with the spark plugs. I suspect that the "corrosion" is due to moisture getting to the plugs when one of the valves to that cylinder was open to the air and moisture could enter over a long time. It doesn't look like there is a massive amount of corrosion like might be caused by a cracked head or leaky head gasket. It appears that the carburetor is running a bit rich (too much gas to air ratio). Could also be plugs are not proper heat range. Or can be that the engine doesn't run long enough to burn off the carbon produced with a cold start. It is normal for cylinders 1 & 6 to run a little lean, 2 & 5 to be about right and 3 & 4 to be a little rich. That is due to the passage length between the carburetor and carburetor (longer distance = more resistance = less flow = less gas). If a cylinder has weak oil rings it might use more oil and therefore have more carbon build up on the spark plug.
How Sweet the roar of a Chevy four!
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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My best compliments Chipper: You did an perfect analysis.
Thank you very much.
Thanks also you Barretfarm: I'm going to count the teeth and then I will let you know.
Saluti dall'Italia
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Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Hi Barrett.
I can't count the gear's teeth.
I ask you and at Chipper if you know if transmission of '29 is same of '31.
Barrett, can you edit some picture of your transmission?
What does it mean: partialy disassembled?
Have you all the pieces (gears and shafts)?
Buona notte dall'Italia
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Joined: Nov 2001
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ChatMaster - 15,000
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ChatMaster - 15,000
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Some of the parts are the same in a 1929 and 1931 transmission. The spline number on the center shafts are different and therefore so are the gears.
How Sweet the roar of a Chevy four!
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Joined: Jul 2015
Posts: 17
Grease Monkey
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Grease Monkey
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Posts: 17 |
alfredo. the transmission I have has no cover or input shaft. the number on the box is 590391. the gear has 20 teeth and slides on a splined shaft wich I also have I hate to pull the gear out if it wont fit. thanks
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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I don't know how we got so far away from 29 spark plugs. Please drift back in line.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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