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09-08-2018, 03:40 PM | #1 |
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Join Date: Aug 2018
Posts: 53
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Merc 255 issues
In previous threads, I've followed instructions for the teapot carb and distributor. I have a 1953 Merc 255 in a 52 Ford Mainline. I now have the car running, fires right up, but upon acceleration it bogs down. No back fire, just bogs down. I've replaced the needle and seat, accelerator pump and 2 two idle screws. Baffled.
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09-08-2018, 04:23 PM | #2 |
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Location: Mill Valley,Ca.
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Re: Merc 255 issues
Use a timing light to check the distributor advance while running.
Is the vacuum advance on the dist. OK? Is the carbureter accelerator pump working... Karl |
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09-08-2018, 05:48 PM | #3 |
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Re: Merc 255 issues
Have you checked the fuel pump for flow and pressure? A weak pump can give enough fuel for idling but not enough to handle a load. A weak coil gives similar symptoms. It produces enough spark to idle OK, but under load (acceleration) will misfire or bog. The old MOTOR and Chilton Manuals from the '50's have the needed specs and good troubleshooting procedures.
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09-08-2018, 06:13 PM | #4 |
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Re: Merc 255 issues
You didn't mention checking the float level.
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09-08-2018, 11:19 PM | #5 |
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Re: Merc 255 issues
Mine did the same thing and all it needed was a coil.
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09-09-2018, 12:13 AM | #6 |
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Re: Merc 255 issues
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Alan |
09-09-2018, 07:19 AM | #7 |
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Re: Merc 255 issues
I have the float set to spec. 7/32
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09-09-2018, 07:20 AM | #8 |
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Join Date: Aug 2018
Posts: 53
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Re: Merc 255 issues
Installed new coil before firing it up. Thanks.
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