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TOPIC: Carbs: 1978 Merc 1400

Carbs: 1978 Merc 1400 13 years 6 months ago #31892

  • 69Fabuglas
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I haven't gotten my manuals for this engine yet..

Could someone scan me the pages on rebuilding the fuel pump, and Carbs? photos/pdfs are fine..
I have cable so big files are OK..

e-mail to: This email address is being protected from spambots. You need JavaScript enabled to view it.

I want to put her in the water again this weekend...

Thanks,
Ray

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Re: Carbs: 1978 Merc 1400 13 years 6 months ago #32028

Is there a " running issue " with the motor or is this preventive maintenance.

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Re: Carbs: 1978 Merc 1400 13 years 6 months ago #32032

  • 69Fabuglas
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running issue...
I'm doing a major tune-up.. and decided to "do it all" at the same time. This motor is "new-to-me". I've done the compression test and ran it (on the lake) on the bass-boat before purchase. 42MPH @ 4100rpm @ 2/3rds throttle.

I am rebuilding the fuel pump and saw lots of "original" hoses internally. So, I decided to do all the hoses, carbs, and fuel pump..

I want an ORIGINAL Service Manual, but that's $$ I don't have right now. (Unless someone wants to trade for several OMC Manuals)

I have already disassembled the carbs and Fuel pump and there is nothing to them.. I am a profession antique auto restorer.. but wanted to have the scans in case there was something "special" to look out for...

The carbs were spotless- but the upper tended to "dribble" gas if I pumped the bulb. I figured the needle or float was stuck or had trash in it. The lower (2) carbs had all-steel needles, but the upper needle had a neoprene tip... That needle stuck pretty hard when the carb was momentarily inverted. I think the neoprene tip was an older non-alcohol resistant type. It felt pretty "sticky" when I cleaned/inspected it, and some black residue remained in the seat and come off the needle on my fingers.

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Re: Carbs: 1978 Merc 1400 13 years 6 months ago #32034

Carburetors on those are pretty simple, nothing special at all.
Check the bleed inserts ( inside bypass covers ) on the intake side of the block, there are 5 inserts in total.
My bet is some are missing.

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