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EFV-8 Club Forum / General Mercury Discussion / 52 Merc. Holley

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Posted By Discussion Topic: 52 Merc. Holley -- page: 1 2 3 4

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mikemerc
04-17-2020 @ 2:37 PM
Member
Posts: 23
Joined: Jul 2019
          
Thanks carcrazy,I’ll give that a try Mike

TomO
04-18-2020 @ 8:14 AM
Senior
Posts: 7243
Joined: Oct 2009
          
I should have been more specific about the fuel dripping. These carburetors sometimes develop a leak from the fuel bowl due to cracks in the bowl, look for fuel on the bottom of the bowl. The floats on the teapot are hard to set and you could have fuel dripping from the top cover. Fuel coming out of the discharge tubes at engine speed above idle are normal, this is the main fuel supply.

Check your spark plugs against this chart to determine if you have a fuel problem.

http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm

The stumble could be caused by the distributor advance. Disconnect the and plug the vacuum hose to the vacuum advance and check the timing. If initial timing is correct, slowly increase the engine while watching the timing, it should advance evenly as you increase the engine speed. If it passes this test repeat the advance test with the vacuum advance connected.

Did you do the MMO procedure? dribble some down with the engine at a fast idle until the engine smooths out, then dump enough to kill the engine. Let it sit overnight and then check to see if it is better.

Tom

mikemerc
04-19-2020 @ 6:24 AM
Member
Posts: 23
Joined: Jul 2019
          
Tom
When looking down the carb ,the gas is not dripping it’s much much more than a drip. Not in a mist by a long shot. I will check the distributor you and carcrazy have suggested. Also the mystery oil. Thanks mike





TomO
04-19-2020 @ 7:52 AM
Senior
Posts: 7243
Joined: Oct 2009
          
Mike, I'll start up my Lincoln today and refresh my memory about the flow of fuel. The carb on it is similar to your Merc carb, just a lot more complicated.

It will not be a mist until it passes the venturi and is mixed with air. Here is a link to the Holley 1901 manual for the carb on your car.

http://www.tocmp.com/manuals/Carbs/Holley/H1901-1952/MCarbHoll19011952.html

Tom

37RAGTOPMAN
04-19-2020 @ 10:42 AM
Senior
Posts: 1940
Joined: Oct 2009
          
HI
was wondering how it ran before you Tuned it up,???
I suspect the condenser . try the old one,or a made in USA. and see if that make a difference,
I did the same thing and when on the road and applied the throttle it started to miss BAD
found out the new Chinese TAIWAN made condenser was at fault after going over the fuel system
it had maybe 20 miles on it, so who would suspect it,
I replace the condenser with a NOS Delco, on my 57CHEV,
LET HEAR how you made OUT,,,,,,,, 37Ragtopman

mikemerc
04-19-2020 @ 5:09 PM
Member
Posts: 23
Joined: Jul 2019
          
37ragtopman
I have checked changed , and put back condenser it ran the same. Thanks mike

TomO
04-20-2020 @ 4:28 PM
Senior
Posts: 7243
Joined: Oct 2009
          
Mike, I looked at the flow of fuel from the main supply on my Lincoln. At idle there is no flow to the main body from the main jets. When I raise the rpm, there is a flow that is not a stream but more like when you hold your finger over the end of a hose. Fuel comes out of the accelerator pump jets when changing speed.

How old is the fuel in your tank? Does it have ethanol in it? Did you add a stabilizer to the fuel when it was fresh?

Tom

mikemerc
04-21-2020 @ 3:26 PM
Member
Posts: 23
Joined: Jul 2019
          
Tom
The fuel is4months old and it was stabilized when I topped it off. When I give more throttle above an idle the gas comes down out of the nozzle tubes,which are connected to the center of the choke plates. When it comes out it is in irregular size droplets. I ordered a rebuild kit ,I’m hoping it will do the trick. If not I guess I’ll pull the distributor and send it to someone to rebuild it again. Mike

TomO
04-22-2020 @ 7:48 AM
Senior
Posts: 7243
Joined: Oct 2009
          
That sound pretty normal.

Unless your plugs are covered with a black soot, I don't think that your problem is the carburetor. Be aware that if you fix something that is not broken, you could introduce more problems.

Did you do the cylinder balance test of shorting out the plugs one at a time and watch for a rpm drop?

Tom

mikemerc
04-22-2020 @ 5:53 PM
Member
Posts: 23
Joined: Jul 2019
          
Tom
Haven’t done that yet ,guess it couldn’t hurt. I’ll try tomorrow Mike

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