Shift switch not engaging when shifting into forward.

[Jquest]

ok....a while back my shift switch was bad and thx to the members of this forum...I found the problem and fixed it myself. Saved me some MULA$$$$. <br />Now I have another question. I noticed that my motor tends to shift a little hard into foward. My motor in Neutral revs around 1k rpm. Today I read my manual and it said that the switch was supposed to temporarly engage while switching in the foward position(making it easier on the engine and gears). So...I whipped out my meter and checked the switch. BAckwards is fine...I put it in reverse and the switch engages. Now....I slowly move the trottle forward, bit by bit, and nothing. No continuity in the switch. Is it like that?? Or is there something broken or misaligned?? The switch assembly/ mechanism appears to be made of SS with the platic piece inserted that holds the switch. If I press down the switch it gives me continuity, as well as reverse so I don't believe the problem is with the switch. Any Idears???

 

[DHPMARINE]

Re: Shift switch not engaging when shifting into forward.

Jquest I don't know of any Johnson/Evinrudes that are recommended to rev @1000 in neutral.I'd fix this before going deeper.I believe the switch is meant to engage when things are wrong,so you can get home,and probably dosen't engage when adjustments are correct.<br /><br />Rough guess here,but get the slack out of the throttle cable,and drop the rpm's to the spec in the manual.<br /><br />DHP

 

[OBJ]

Re: Shift switch not engaging when shifting into forward.

Absolutely what DHP said! Your lookin' for some rounded off lobes if ya' don't get those revs down. Which manual do you have Jquest and what engine we talken about here? 71' or 72' something?

 

[Jquest]

Re: Shift switch not engaging when shifting into forward.

That's one of the problems I'm having. I thought it was high. I was reading and thought maybe the switch might have something to due with it. I've checked the linkage and stuff.I've adjusted it and put it tight and given it slack , but I can't seem to find the solution to make it lower. I'm probably going to end up taking it to a wrench. <br /> I've looked through the manual and the stuff... but I can't find the adjustment(screw or anything) on the engine and I just don't want to start tweaking everything and making one big mess. It has 6 carbs and it looks like they are sync'd and fully closed when in neutral. I'm not sure where to attack it to lower the revs. Any suggestions would help.

 

[Jquest]

Re: Shift switch not engaging when shifting into forward.

I have the Johnson Manual B737-2 The engine is a 2001 V6. carbed.<br /><br />Edit: I'm running it 50:1. Vro is plugged with the Amp plug and oil plug disconnected. If that helps any.

 

[Walker]

Re: Shift switch not engaging when shifting into forward.

The shift interupt switch works when shifting out of gear into neutral

 

[OBJ]

Re: Shift switch not engaging when shifting into forward.

Jquest...are you running the engine on muffs or in the water when your doing these "tests". It makes a difference. Out of the water and on muffs, the engine will natually idle at a higher rpm because there is no back-pressure against the cylinders. I would suppose that if you drop the engine in the water and start it up, your idle rpms would drop to somewhere around the 700 to 800rpm range.

 

[Jquest]

Re: Shift switch not engaging when shifting into forward.

Muffs..... THx for the quick reply OBJ. To be quite honest.. I haven't given it that much thought when I drop the boot in the water. I was so anxious to get going. I guess tomorrow I'll to it to a local canel near my house and crank it up there. There is a free ramp so no biggie. Once I get it in the water and it warms up to normal temp... it should be at the highest of 800? ANd if I throw it into gear...it should come down to the 6-700 range?<br />BTW...on muffs what would you consider normal revs when it's out of the water?? That way....I know if there is something else going on.<br />Also...thank you everyone for the quick replys. I really appreciate all the suggestion and it helps with the learning curve in this place. Just wish that more big engines were discussed. But then again...there is always the search button.

 

[OBJ]

Re: Shift switch not engaging when shifting into forward.

Don't have a book to give you accurate numbers J, but I would say 800 is a good ballpark...Maybe a little lower. Idle in gear and you'll lose around a 100rpm.....just remember these are ballpark. On muffs you can see 1000 to 1200rpm on an accurate tach. I've set some engines to 1200rpm on muffs and have come close to specs....this was just to get me in the range and on the water to fine tune the engine.<br /><br />Keep us posted of your progress....thanks.

 

[Jquest]

Re: Shift switch not engaging when shifting into forward.

No...thank you. Just one more thing. <br />Walker posted that the shift switch works coming into neutral. I have 6 cylinders. Is the shift switch on 'til I ease the trottle forward already in forward gear? <br />Now I'm a bit confused. The switch only makes when I throw it in reverse. Is it also supposed to be on when I'm going into foward? IF that is the case....then my linkage is not set correctly. OR...if I'm in neutral, out of the water, with the muffs on.... are all 6 firing?? Just want to be clear on that. IF I don't ask...don't know.

 

[Joe Reeves]

Re: Shift switch not engaging when shifting into forward.

When running on a flushette, a 20" shaft engine should be running at approximate 1000 rpm, a 25" shaft engine at 1200 rpm. In the water the rpms will drop to a normal rpm.<br /><br />The shift interupter switch is neither off or on, the term is... making contact or it is not making contact.<br /><br />When shifting into or out of gear, the switch makes contact for a mere fraction of a second, knocking out the ignition on the starboard bank. When it is operating properly, the loss of ignition on that bank is not noticeable.<br /><br />The main purpose of the shift interupter switch is to allow that ever so slight interuption of ignition so as to shift OUT of gear. There have been cases where engines having a propeller of such a design that the water pressure is so great against the blades, and therefore creating such a great amount of force at the shifter dog/gear lobe areas that it is impossible (even at a low rpm) to shift the engine out of gear without this interuption of the ignition.<br /><br />On a flushette, obviously the shift switch interupter is of no advantage as water pressure on the propeller blades does not exist.

 

[Jquest]

Re: Shift switch not engaging when shifting into forward.

Ok..to put it plain and simple. With the engine off....if I slowly push the trottle level forward from neutral...will/should I get a momentary make.

 

[seahorse5]

Re: Shift switch not engaging when shifting into forward.

The shift interupter switch only activates if there is resistance in the linkage. For example, when shifting out of gear, the force to pull the clutch dog out of forward gear is very high while the motor is running. As you pull back on the shift lever, resistance increases and the shift switch activates, cutting out 3 cylinders and making the motor run rough momentarily. As soon as the motor runs rough, it is a lot easier to disengage the clutch dog. As soon as it is disengaged from the forward gear, there is no more resistance on the shift cable so the shift switch turns off. When the linkage and shift adjustments are in good shape, you never feel the shift interupter kick in.

 

[Jquest]

Re: Shift switch not engaging when shifting into forward.

DOH!!! Thx for you responses and patience with me. Got it.