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EFV-8 Club Forum / General Mercury Discussion / Spark Plugs 1946 Mercury

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Peder D
10-03-2015 @ 6:00 AM
Member
Posts: 95
Joined: Oct 2009
          
There has previously been a discussion on this topic.
I see that 2 brands of spark plugs were mentioned. Autolite 216's and Champion RJ14YC box no. 63. I am currently using Champion H-10's, but would like to try one or both of the above, since I still have "fouling" even though everything under the hood is new. Question:
where can I buy these plugs in the U.S.? Thanks, Peder

cliftford
10-03-2015 @ 6:11 AM
Senior
Posts: 845
Joined: Jan 2014
          
Champion H10s were origional equipment for this car. If you are getting plug fouling and the plugs are good,I would look for other problems.

Peder D
10-03-2015 @ 12:56 PM
Member
Posts: 95
Joined: Oct 2009
          
Thanks, but again, everything is new under the hood. We can probably safely assume that the relatively high alcohol content in todays gasoline would dictate a different spark plug than back in 1946? Would appreciate info on where the mentioned plugs can be purchased. Thank you.

len47merc
10-03-2015 @ 1:39 PM
Senior
Posts: 1165
Joined: Oct 2013
          
All the major parts shops - CARQUEST, Advance, O'Reillys, AutoZone - have both, as do most other on-line auto parts websites. For serious judging I carry with me the original H10's that came in the motor and install them only for the event. For driving, have run the 216s for a while now with very good results. Btw Peder - (early) '47 Merc w/59AB motor.

Steve

This message was edited by len47merc on 10-3-15 @ 1:39 PM

ford38v8
10-03-2015 @ 2:26 PM
Senior
Posts: 2735
Joined: Oct 2009
          
Peder, I understand that you have everything new under the hood, but the plugs are not your problem if they are in good condition. Something is out of whack among those new parts. Tell us exactly what you replaced and how they were installed and adjusted. Start with the carburetor please.

Alan

len47merc
10-03-2015 @ 2:42 PM
Senior
Posts: 1165
Joined: Oct 2013
          
Peder - I agree with Alan but wanted to give you the answer to the specific question you asked. To take Alan's reply a bit further, could you please also describe your fouled plugs, condition and color? A pic of the most common appearance/condition would help as well. Thanks -

Steve

cliftford
10-03-2015 @ 6:12 PM
Senior
Posts: 845
Joined: Jan 2014
          
For what it's worth: I'm using Motorcraft AL7C plugs in my '48, also newly rebuilt,because I had them on hand, and I'm burning corn gas. Last week I pulled a plug just to check it and the color was perfect.

TomO
10-05-2015 @ 4:47 AM
Senior
Posts: 7243
Joined: Oct 2009
          
Peder,

If your plugs are carbon fouled (black and sooty) it may be from too much idling and low speed driving. It could also be from a leaking power valve gasket.

The leaking power valve gasket affects idle mixture adjustment. Set the idle speed to 375-400rpm. Lightly seat the idle mixture screws and open them 3/4 of a turn. Then adjust for the highest vacuum or the smoothest idle by turning both screws in the same direction 1/8 of a turn. If you cannot get a smooth idle by the time that you have opened them 1 1/4 turns, you have a leaky power valve gasket.

If the idle mixture is correct, then you are not doing enough high speed driving to keep the plugs clean. Try driving the car at speeds above 40MPH every time that you take it out and drive it for at least 30 minutes each time. The Champion RJ14YC plugs will help if this is your problem.

Tom

Peder D
10-08-2015 @ 10:27 AM
Member
Posts: 95
Joined: Oct 2009
          
Ok, thanks to all for helpful info and advice. The carb. has been rebuilt, now "semi rebuilt" due to a leak. Adjusted the float, seemed to be a little "high". Will also check with the mechanic who did the work on the carb including the power valve gasket. Will pull the plugs to check out condition and do a compression check. More on this later. Thanks again to all for your kind replies. Peder

Peder D
10-30-2015 @ 7:48 AM
Member
Posts: 95
Joined: Oct 2009
          
Hi guys! No news yet on the previous issues. But, yet another problem has arisen...had my speedometer checked by a reliable shop. Had ceased to show correct speed and the odometer mechanism was "shot".Everything inside is worn out, and no parts available in this country. Was advised to find/buy another speedometer in good condition or one that could be used as parts...is there anyone out there with a "load" of 1946 Mercury speedometers for sale? Mine has the brownish color and red numbers. A long shot, I know...thanks Peder

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