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Discussion Topic:
52 Merc. Holley
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mikemerc |
04-17-2020 @ 6:28 AM
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Member
Posts: 23
Joined: Jul 2019
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TomO , Thanks for the info . Guess I’ll start with the easiest.gettting some mystery oil today. Thanks mike
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TomO |
04-16-2020 @ 7:47 PM
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Senior
Posts: 7244
Joined: Oct 2009
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Daytona parts has a kit for your carburetor. That is not an easy carb to rebuild. Be very careful to tighten the screws just enough to close the lock washer and alternate sides when doing this. You do not want to warp the dicast. Set your choke to the rich side and see if that helps. If it does, you have a fuel delivery problem. Watch for fuel dripping from the upper chamber, if you see some the carb needs rebuilding or replacement. Check your dwell at all speeds it should not vary more than 1 degree. If it does, the bushings in the distributor will have to be replaced. Do a cylinder balance test at about 15oo rpm. Short out each plug and watch for a rpm drop. All cylinders should give the same rpm drop. If one or more cylinders have a smaller drop, check the plugs and compression. Dribble some MMO down the carb, you may have sticky valves. Vacuum gauge readings would also help diagnose the problem.
Tom
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mikemerc |
04-15-2020 @ 1:00 PM
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Member
Posts: 23
Joined: Jul 2019
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Alan, I did replace that hose before checking the fuel pump pressure and volume.thank you for your input. Mike
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ford38v8 |
04-15-2020 @ 9:55 AM
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Senior
Posts: 2739
Joined: Oct 2009
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Mike, What hasn't been addressed by anyone so far is the flex line from firewall to pump. They tend to collapse internally, causing a restriction that impedes flow, sometimes just enough to cause a miss like yours. Bob Shewman has fuel resistant flex lines: 610-993-6637
Alan
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mikemerc |
04-15-2020 @ 8:47 AM
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Member
Posts: 23
Joined: Jul 2019
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Hey guys ,back again. With all the things I’ve checked I’m thinking the carburetor might be my problem. Maybe a clogged fuel passage or I’ve heard it may be a power valve? Any ideas on where to get a rebuild kit ? I probably should have mentioned this before, this problem happens when engine is hot or cold,it will rev right up but breaks up when you try to hold the rpms steady. Thanks for any and all help mike.
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56MarkII |
04-13-2020 @ 10:25 AM
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Member
Posts: 63
Joined: Jan 2012
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This message was edited by 56MarkII on 4-13-20 @ 10:29 AM
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mikemerc |
01-07-2020 @ 2:19 PM
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Member
Posts: 23
Joined: Jul 2019
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This message is to all who responded to my problem. Coil wire and all 8 plug wires show a good whiteish blue spark at about 1/2 inch from a good ground. Fuel pump delivers a total of 8 ounces of gas as per the instructions given. No kinks or obstructions in line from tank to carb.the one thing I forgot to say about my problem is that this condition happens whether engine is cold or at running temperature. I am thinking now that my problem could be in the vacuum advance and or the source of vacuum at carb, or the carb itself as mentioned in the responses to me. Going to put this mess on hold, going to where it’s warmer for a few months and tackle in the spring .thanks to all who helped out ,it meant a lot to hear from you all. Mike
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TomO |
01-04-2020 @ 7:32 PM
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Senior
Posts: 7244
Joined: Oct 2009
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Mike, another thing to check is the primary wire inside the distributor. The insulation could be bad and the ignition shorting out when the advance moves the point plate.
Tom
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mikemerc |
01-03-2020 @ 9:09 AM
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Member
Posts: 23
Joined: Jul 2019
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TomO. Thanks for responding, I will check spark each cylinder.and check fuel pump as you explained. Thanks mike
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mikemerc |
01-03-2020 @ 8:58 AM
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Member
Posts: 23
Joined: Jul 2019
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car crazy, thanks for helping. The wires appear to be copper strand soldered at both ends of the wire. Fuel pump tested at 3to4 pounds pressure at idle and when at an rpm to make engine miss. I will check volume of pump next .thanks. Mike
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