shifting issue changing from point to electronic distributor

[diver dennis]

I have an 1987 24ft Bayliner I'm replacing my old 305 engine with a new 5.7 GM vortec with a Delco EST ignition. The people selling the engine said there is an issue with the shifting, and that there is a part that will remedy it, but they don't sell it. Can anyone shed any light on the subject.<br />Dennis Kaleta

 

[rodbolt]

Re: shifting issue changing from point to electronic distributor

did you get the EST timing tool?<br /> and is the shift set up merc or OMC. and what drive do you have.

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

Thanks for the reply<br />I didn't order the motor yet I want to fiqure this out 1st. <br />is the shift set up merc or OMC I don't know.<br />I have a OMC Cobra outdrive.<br />Dennis

 

[DHPMARINE]

Re: shifting issue changing from point to electronic distributor

I don't have an answer,either.But I wouldn't buy the engine from someplace that did't have the answers.<br /><br />DHP

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

Your right good answer.<br /> They said a lot of people buy them and have no trouble and they told me to contact an OMC dealer, but I don't live anywhere near one. They say it needs some kind of shift interupter and to make sure I tell the dealer the new engine has a Delco EST ignition.<br />Dennis

 

[rodbolt]

Re: shifting issue changing from point to electronic distributor

your cobra interuppter will work just fine.<br /> you will toss the ESA module and rewire the inturrpt switch to accomodate the EST.<br /> some I can wire to lock to base timing when shifting out of gear and others I have to wire to "kill" like the merc system. either way is simple.

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

So let me get this right. I use the interupter switch on the shift cable to replace the ESA module or I wire it into the module?<br />Dennis

 

[rodbolt]

Re: shifting issue changing from point to electronic distributor

with EST ya remove the ESA module and toss it in the creek or sell it on ebay or mount it on the wall like a deer head. you wont use it with the delco EST.<br /> does your interupt switc assy also incorperate the over stroke switch?

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

I'm not sure how do I tell also thank you for the help.<br />Dennis

 

[rodbolt]

Re: shifting issue changing from point to electronic distributor

look on your shift transfer block. if there are 2 switches it has aan over stroke. the interrupt will be two blue wire the over stroke two black wires. a pic of the shift transfer block would help. mating the EST is not a problem. I can tell ya what pins go where. however with the overstroke it tosses in a new wrinkle and become more complex. not harder just more wiries to move.

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

I remember seeing one, not sure about the other. Ill check it out. We are doing the replacement next fri and sat. I'm in PA now, the boat is at a freinds in Delaware I'll ask him about the switchs.<br /> I'll check back tomorrow.<br />Thanks again<br />Dennis

 

[newport dave]

Re: shifting issue changing from point to electronic distributor

I think the only non-EFI engine that ever came from the factory with a shift interrupt switch and Delco EST distributor was certain years of the Mercruiser 3.0. They were wired so that one side of the shift interrupt switch switch connected to the ignition power circuit (positive side of the coil), and the other side of the switch connected to terminal "B" of the four wire connnector at the distributor. <br /><br />In your situation, the ESA module would no longer be used or needed. As far as the need for the overstroke switch, it could remain in the circuit and in fact it should still function virtually the same as it did.<br /><br />Below is a wiring diagram from the Mercruiser 3.0. I believe your new engine will have to be connected the same way, but yours may have the overstroke switch also in the circuit with the interrupt switch.<br /><br />It would be helpful you could obtain and post a wiring diagram of the new engine. Then you could determine exactly how to wire the switch, and get their (engine sellers) feedback before you buy.<br /><br />Dave<br /><br />

 

[rodbolt]

Re: shifting issue changing from point to electronic distributor

that is the easiest way to wire it. you can modify the timing tool to look like the part in the 4 pin side of the module, 2 whites and a white green or you can buy the plug from merc. you will have to modify the pin wiring on the amphenol connectors but its easy. hardest part is pushing and pulling the pins if you dont have the removal and insertion tool.

 

[Boatin Bob]

Re: shifting issue changing from point to electronic distributor

dennis...if yours was an 87 then it should have the overstroke switch on it however at some point OMC redesigned the ESA module and put a timer circuit in which eliminated the need for the overstroke switch. If your ESA module has been replaced it may have the new style. I did one a few years ago and the instructions tell you to leave the switch installed but the new wiring harness doesn't connect to it. Check the 4 wire connector from the ESA unit and see if it only has 2 wires or 4 (one pair is actually a jumper).

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

This is a link to the wiring diagram for the new motor.<br />Dennis<br /><br /> http://www.ebasicpower.com/downloads/EDMbasewiring.pdf

 

[newport dave]

Re: shifting issue changing from point to electronic distributor

The diagram confirms that the shift interrupt should be connected the same way the Merc 3.0 is connected. Should be an easy hook-up.<br /><br />Dave

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

Thank you for all the help.<br />Dennis

 

[diver dennis]

Re: shifting issue changing from point to electronic distributor

Just to be sure the new engine diagram says only for Mercruiser I/O. I have an OMC is that cool? if so Were is the ESA module that I need to remove?<br />Dennis

 

[rybad]

Re: shifting issue changing from point to electronic distributor

The ESA's are mounted in a bracket on top of the manifold, usually right behind the carb.

 

[rybad]

Re: shifting issue changing from point to electronic distributor

Is you ESA on an 8 cylinder?? If so, (and its functioning) I'll buy it off of you.