rebuilt carbs

[BigJoeB]

Well, last june I bought online 2 rebuilt rochester quads for my 5.7 mercs 1988 vintage. I pulled the old ones off that were not to bad but my mech friend suggest to get rebuilts or have mine rebuilt. So, I just went online to a site from ebay with great feedback and bought 2. I did all kinds of maintenance work to the motors this season, everything is new except for the blocks themselves. We went to turn over the motors and they both were indentically running at 1100 rpm which is no good off course and thats after adjustement. . My next move was that I had my old carbs and monday brought them to a guy in NJ. Rebuilt my old ones in 3 days and I installed them yesterday and the motors purr like a kitten. I had just sent an email to the company in california to see what they can do for me about the new rebuilts I had bought from them. I am not looking for a refund, maybe an exchange for new ones. with the same serial numbers.. another pain in the ass thing to set me back to splash here.. Love boating ha ha

 

[Mike Blake]

4 years ago I changed my delcos for the Holley exact replacements. Better gas mileage start better all round the best.

 

[ttmott]

There are probably 500 variants of the quadrajet and to get a rebuilt one to match your application is a real shot in the dark. From the jetting to the weight on the secondary air valve to the idle air circuit and twenty other things are all variables. Rebuilding your originals is assurance the calibration will be correct for your application. Another thing, it's really easy to rebuild a carb; get a rebuild kit from NAPA and a gallon of cleaning solution and compressed air. Keep track of the parts, know where they all go (this is all in the instructions with the kit), and most importantly clean, clean and clean....

 

[Chris Nowell]

Another thing, it's really easy to rebuild a carb; get a rebuild kit from NAPA and a gallon of cleaning solution and compressed air. Keep track of the parts, know where they all go (this is all in the instructions with the kit), and most importantly clean, clean and clean....

:thumbsup:+1 on that. I've always rebuilt any of my carbs that have needed servicing, as opposed to replacing them. Get a Mercruiser manual and a certified "marine" carb kit, and follow instructions on both. I've always used mineral spirits to clean the parts, instead of that automotive carb cleaner stuff (as per the shop manual). The only problem I've ever had was when a throttle plate was sucking air past the bushings once. Had me stumped but the Chev high performance shop figured it out and a machine shop corrected the part. Other than that my engines have run just fine after my rebuilds.

Also, some of those "off the shelf" exchange carbs have been "on the shelf" for quite a while. I don't trust stuff like that if it's been sitting around unused for a few years. Good luck.

 

[OldSkool]

There are probably 500 variants of the quadrajet and to get a rebuilt one to match your application is a real shot in the dark. .

This is absolutely true. Take any rebuild kit and look at the float, idle and choke rod settings. Any or all could cause an issue. When I rebuild mine I never rebend the linkage rods. There is nothing to get them out of adjustment but the worn parts you are replacing. Float and choke position is another thing. You may need to play with them if you don't know your exact carb number.