Shake down not good and advice?

[rodbolt]

Re: Shake down not good and advice?

get tilliam and yourself to post all the test equipment you have. sounds like fuel delivery someplace betwen the liquid level in the tank and the cylinders.<br /> write down on paper all the stuff the motor is supposed to do, then write down what its not doing.<br /> then figgure out wich engine subsystem is capeable of creating the issue, then confirm or eliminate each part of the subsystem.<br /> I am not a refugee, its all we had back then

 

[thunderroad]

Re: Shake down not good and advice?

rodbolt....I wrote the words "refugee from the carburetor days" with a tear in my eye. I love fuel injection and have become pretty spoiled by it in my vehicles but still remember the fun of working on or swapping out carburetors on school nights so the cars would be ready for the weekend back in the late 60s.

 

[capthook]

Re: Shake down not good and advice?

thunderroad you wrote something that caught my attention. I dont have a ball in the accel pump it is a spring and that is it. Am I missing the ball. Here is what I have replaced so far. Fuel filter, spark plugs, rotor and cap, carb rebuild, and now here is what I will be doing tonight, coil, set timing, water sep, well at least me ignition system will be new. I bought a timing light and compression tester last night and will be checking compression. A guy told me that he thought that these heads for these engines were notoruious for warping heads and gaskets. Boy this is a long road to travel but learning a hell of alot along the way thanks for all the help so far.

 

[capthook]

Re: Shake down not good and advice?

I tlaked to TNT, National and I think Wharf

 

[TilliamWe]

Re: Shake down not good and advice?

Jim's Marine would the one to go to if you don't get it solved on your own. He's on Vorhis I think.<br />rodbolt, your sarcasm is noted, and unecessary, thank you In the other thread, I was just letting a hometown guy know that I'd love to help, but am not equipped to do so. I'll let the experts here give him ideas.

 

[I/O WALDO]

Re: Shake down not good and advice?

Did it get hot on the 29th?

 

[capthook]

Re: Shake down not good and advice?

Nope it was right at 140 deg. Thats where it has always stayed.

 

[thunderroad]

Re: Shake down not good and advice?

There is a little ball, about the size of a BB under the spring in the accel pump cavity. Mine was missing. When you'd crack the throttle you would see a little fuel blubber into the throat. After he replaced the missing ball it was two nice, solid streams. Made a big difference. Don't ask me how it works or what the ball does. Some sort of check ball, I'd assume.

 

[thunderroad]

Re: Shake down not good and advice?

The ball is reference no. 36 in this picture. Called "Ball, check"<br />

 

[retodd]

Re: Shake down not good and advice?

The accelerator pump refills itself through that exact passage in the carb. That little ball is exactly that, a check valve. There is a matching one in the pump plunger that closes the oppisite direction. This one in the bottom keeps the fuel from backflowing towards the fuel pump when the accelerator pump is actuated...So yes, having it in there will make a big difference.

 

[capthook]

Re: Shake down not good and advice?

I will tear down the carb tonight, because I know that there was not a ball in there therefore I did not put one back. I took everything apart and back together the way that i saw it. I have a manual clymers I will referance to this. GOD I hope this is somewhat of my problem. I wonder why I did not have this issue last year?????

 

[thunderroad]

Re: Shake down not good and advice?

Can't answer that but mine was missing last year too. I thought it was terribly doggy at the start. You had to really feather it to keep it from stalling. I doubt this totally fixes the problem of dying at idle. I'll bet there is (or was) some junk in the idle circuit.

 

[Gary H NC]

Re: Shake down not good and advice?

Makes me remember the good old days...rebuilding four barrel rochesters and thermoquads..<br />Nothing to those little rochesters..

 

[capthook]

Re: Shake down not good and advice?

Well I messed with the timing a little last night and got it to stop backfiring. But then my timing light stopped working and also my tachometer. WHAT THE HEEK COULD HAPPEN NEXT! Sorry had to vent a little. My dad called and said that he found a brand new 2brl rochester carb in his garage. So I will be picking this up tonight and also a working timing light. I am going to get this boat running or die trying.

 

[retodd]

Re: Shake down not good and advice?

I could be waaaaay of but in my best recollection, both the timing light and the trigger for your tach get their impulse from the #1 spark... Seems way too odd for you to have lost both of these at the same time. More likely cause is in the ignition itself.

 

[harveje]

Re: Shake down not good and advice?

Is the picture above a Roch. or Mercarb? 1 idle screw? Do both carbs have the ball under the spring?

 

[harveje]

Re: Shake down not good and advice?

Points or Elec. ign. ? I changed my '79 898 merc. to elec. and LOVED it, after initial set never had any problems with backfires, no starts, rpm issues, etc..

 

[thunderroad]

Re: Shake down not good and advice?

harveje...you're right. That does appear to be a mercarb. Mine is a Rochester and it definitely needed the little ball. Upon looking, you could clearly see where the ball had been there before, plus it worked great once it was put back in.<br />An amateur mechanic tried to put a kit in the carb before last season and no doubt lost the check ball at that time.

 

[capthook]

Re: Shake down not good and advice?

I have an electronic ignition. Also what do you mean about ignition itself. Are you talking about timing?

 

[tie_one_on]

Re: Shake down not good and advice?

"My dad called and said that he found a brand new 2brl rochester carb in his garage."<br /><br />Please make sure this is a marine carb ......<br />or else this may come true....<br /><br />"I am going to get this boat running or die trying"