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606 fuel pump

Y

youngin

Member
Well my 606 is missing a little. I thought it was a injector so I cracked the lines to see which one it may be. Well their was one that wouldn't leak until I took it the whole way off and when you throttle it up it squirts less fuel. Is tis possible? I took my 706 pump to diesel injection place and it cost my about $1000, but only 2 days. Another guy I know said he could send it out $300-$700, but 3 week turn around. Any ideas?
 
A shot in the dark here, first of all a rotary dist pump like the Roosa master would be highly unlikely to deliver less fuel to one cyl than another due to the design. It is possible, as anything is, but I never saw it. What can and does happen though, is that the injection nozzle preceeding that one in the firing order is bad and letting excessive fuel through it and thus short changing this nozzle. Pull all lines off nozzles, crank engine and see if fuel or compression shoots out of one, definetly should not. (ps, they are actually nozzles and not injectors as so many refer to them as).An injector does the pumping also like in a cam operated injector in a cummins PT style fuel system. Just had to throw that in for what it is worth.
 
I don't know much about them but sounds like Pete might have given you a $1000 worth of advice. If he nailed it, maybe you could move the bad nozzle to the end of the rotation for a temp fix.
 
I have seen the same problem just as Pete described. The cylinder with the bad injector is not the one that has the miss but rather it is the one preceding it in the firing order.

The Roosa Master fuel injection pump depends on maintaining some residual pressure to get a sharp and even start to injection. A leaking injector will bleed off this pressure resulting in over fueling that cylinder but the next cylinder will be short on fuel because injection will start late because the pump has to make up the lost pressure before the injector will open.

You can swap a couple of injectors to make sure the problem follows the injector.
 
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