Throttle syncing issue. 140 evinrude. Pics

[archcycle]

1989 or 1990 evinrude 140hp

I'm trying to follow the directions in my manual but the pics are very unclear and one bolt seems stuck.

In the first picture, can someone verify for me that I have the right screw for the Cam Follower Screw? Also it looked like the line in my manual was going to the other one and I loosened it and put it back. Touch these or no?

Second pic, I think I have the throttle valve sync good to go on to this step, but manual says to back this bolt off until no spring pressure is felt. It won't move either way. If I put any more force on it I'm worried something could break, or at least strip. Obviously then I'm either feeling that spring pressure, or can't feel it because I can't get it to move. Is this an OK thing to put PB blast on or do I have something causing too much spring tension and therefore can't move it? I'd also appreciate an explanation of what's going on in there with spring pressure and what that's doing.

Thanks all

 

[tashasdaddy]

Re: Throttle syncing issue. 140 evinrude. Pics

2nd picture loosen the locking nut and it will turn. that is the cam follower screw, the one on top of the carb is for adjusting carb butterflies, to wide open, which should not really need adjusting. suggest you get some help before you really mess something up.

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

I did back the lock nut up though, it's got plenty of free space on either side of it. My concern was that the manual said I would feel spring pressure as I backed it out, and I would hate to find out it didn't want to budge because of spring pressure not having been released rather than just needing some solvent. Guess it's PB blast to try to free it up then.

edit: the rod the butterfly screws push on didn't move. in fact, they had divits in them from the pressure that was put on them before. Checked this out with a flashlight when I re-tightened them and noticed they wanted to grab right onto a spot so that adjustment should still be good.

 

[Dhadley]

Re: Throttle syncing issue. 140 evinrude. Pics

Yes, that is the cam follower screw in the first pic. Yes, it's OK to loosen those throttle shaft screws. When those are loose you loosen the 2 phillips head screws in the plastic link. Then make sure the port side butterflies are closed. Then make sure the starboard side butterflies are closed with the cam follower screw loose. Once all the butterflies are closed then retighten the screws in the plastic link. Then line up the cam follower so it contacts the roller at the right time (line).

No need to mess with that screw in the throttle arm at this time. That's the wide open stop, no spring or anything trick. The spring is in the tube up by the timer base just under the flywheel. That's how you set the idle speed. Make sure you set the idle speed in the water with backpressure in the exhaust. It will be a bit high on a flushette with no backpressure.

 

[daselbee]

Re: Throttle syncing issue. 140 evinrude. Pics

First pic: Yes that is the cam follower screw. To adjust the throttle synchronization, you loosen the two phillips screws on the angled plastic link. That allows the two sides of the angled plastic link to "slide" within each other, and the adjustment is made. Tighten the screws after adjusted.
You want the throttle plates to be COMPLETELY closed at minimum throttle position (idle), AND you want the throttle plates on both sides to move together in perfect sync when advancing the throttle. You will absolutely NOT BELIEVE how a very very small misadjustment in the throttle plates will affect the quality of the idle. It is a critical adjustment. Take your time at it making it perfect.

By the way, your throttle pickup roller is bad.

Second pic: That screw is frozen in the threaded boss if it won't move after loosening the locknut. You will not feel any spring pressure. It is merely a stop screw that prevents the throttle from travelling past a given set point, the WOT position where the throttle plates are 90* to the carb venturi and no more.
The one above it sets the closed throttle position, and functions the same way...simply as a stop to limit travel. These set points are defined and adjusted as part of the link and sync.

I kinda agree with TD...maybe you should get some experienced help for this first attempt. Once it is clearly explained, it is a really simple procedure.

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

You want the throttle plates to be COMPLETELY closed at minimum throttle position (idle), AND you want the throttle plates on both sides to move together in perfect sync when advancing the throttle. You will absolutely NOT BELIEVE how a very very small misadjustment in the throttle plates will affect the quality of the idle. It is a critical adjustment. Take your time at it making it perfect.

I'm doing this because I have a lousy idle actually. The thing that got me on this track was when I was rebuilding the carbs a while back I noticed that the port side butterfly was opening farther than the starboard which leads me to believe it may not be fully closing with the starboard. Hence this procedure. For reference, things I've done toward the idle issue so far (although not all because of it): rebuilt the carbs, checked spark and verified wires on the correct plugs, replaced plugs, replaced boots, fixed bad wire splices from the powerpack to the coils done by a previous owner, decarboned, replaced the coils.

By the way, your throttle pickup roller is bad.

Are you referring to its current position or are you saying something is physically wrong with it?

I kinda agree with TD...maybe you should get some experienced help for this first attempt. Once it is clearly explained, it is a really simple procedure.

I wish I knew a marine mechanic that could walk me through it, but I've just got iBoats and a Clymer manual at the moment.

 

[daselbee]

Re: Throttle syncing issue. 140 evinrude. Pics

No it is physically bad. You need a new one. The outer "sheath" of the roller is missing. Very common failure. Right now it is rolling on the black plastic center hub.

And your location is?

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

Gulf Breeze, FL. It's a peninsula just out side of Pensacola.

Edit: just checked the roller and it must just be a bad angle on that picture, it definitely has a black plastic roller held onto the metal arm with a black retaining ring between it and the ball at the top of the arm.

 

[oxbeast1210]

Re: Throttle syncing issue. 140 evinrude. Pics

Hey I live near you !!but I'm not a mechanic just
Work on mine . Anyway the little black roller on the
Metal is supposed to have a clear plastic sleeve over it
Mine was missing I just replaced it last week
If it's missing it throws the whole linkage off
So you can't really do it unless u replace that part one the roller
Should b around ten bucks . Let me
Know if u have more questions

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

Cool I've probably seen you out there then. What boat? I'm the green stripe 16' cape horn w/ t-top that might as well be moored in the pensacola pass

As for the part-
http://www.boats.net/parts/search/B...CXESR 1990/CARBURETOR AND LINKAGE/parts.html#

I guess you are referring to 30 & 39? It sure looks like they are on there but I will go to the shop at lunch today and have a look.

 

[oxbeast1210]

Re: Throttle syncing issue. 140 evinrude. Pics

I live in milton and have been fishin in the flats mostly i haven gone out to the pass im not to familiar with the area yet so hopefully i eventually get out there! and yeah #30 you need for sure 39 might still be on there mine was still there its a rubber ring that keeps the piece from sliding off

#30 is actually two parts a black roller that has a clear plastic sleeve on it mine was clear with a hint of yellow . Its common for the sleeve to eventually crack and break off

let me know if you want to see pictures of mine or something so u can see what im talking about

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

Picture probably isn't necessary unless you've got it right there now. I'll be taking lunch in an hour or two and going to the shop to get it. Will be picking up that ring too. With my fingernail I couldn't tell if it was solid plastic or old hardened rubber, so it's probably not going to survive removal.

 

[oxbeast1210]

Re: Throttle syncing issue. 140 evinrude. Pics

No i dont have the picture on me wont hurt to get the ring i took mine off with pliers and it survived but theres no telling what shape yours is in.

 

[daselbee]

Re: Throttle syncing issue. 140 evinrude. Pics

Oxbeast is telling you right.
The roller has a clear/yellowish outer sheath on it that ages and cracks off.
As I said, you are rolling on the inner black roller. The new roller will be almost 1/2 inch in diameter.

Cannot do a good link and sync with a bad roller.

The roller is held on by a small o-ring. Simple tight o-ring.

The roller is about $7.35 or so, if I remember right, and is used on many many model numbers.

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

Just picked up my new roller (indeed. clear sleeve.) and o ring

 

[oxbeast1210]

Re: Throttle syncing issue. 140 evinrude. Pics

sweet now its time to mess with the link and sync if the carb butterflies are opening at different times thats what you need to adjust they should all open and close at the same time if you havent messed with the timing theres no reason to mess with it unles u suspect its off . you should just be messing with the link and sync aspect of it so be careful which screws you loosen or tighten. the very first adjustment that was on my motor was to get the carbs butterflies synced so they open and close together , after that the cam follower be careful how you end up leaving that one cause if it makes contact with the cam before it should your prop will start spining just as if you were giving it gas as if you are giving it throttle so make sure you follow what your manual says when lining up the cam and the follower keep us updated

my guess is if it runs well at other rpm the only thing you should have to really mess with is getting the cam follower roller on and getting your carbs synced to open and close at the same time

 

[boobie]

Re: Throttle syncing issue. 140 evinrude. Pics

If you get in real trouble, take it up to Wills Marine in Pensacola and Jack will straighten it out. He's a good friend of mine and been in business a long time.

 

[archcycle]

Re: Throttle syncing issue. 140 evinrude. Pics

If you get in real trouble, take it up to Wills Marine in Pensacola and Jack will straighten it out. He's a good friend of mine and been in business a long time.

Wow thanks but I'm already aware that mechanics exist. I'm here to learn how to repair and maintain my motor though. If I didn't have any desire to learn about this I would have sold this thing and bought a brand new one long ago. It's absurd how many responses on a motor repair help forum seem to be hey guy just give up and hire someone.

To those that are posting to help out, I really appreciate it! Been busy looking for a new house the last two nights and haven't had a chance to work on the boat but I'll post progress when I can get to it.

 

[oxbeast1210]

Re: Throttle syncing issue. 140 evinrude. Pics

Sounds good
Good luck with finding a house!
And please do keep is posted

 

[boobie]

Re: Throttle syncing issue. 140 evinrude. Pics

Sometimes it's very hard to give good advice on a forum like this when you're not standing over the person you are giving the advice to. But then again what do I know as I've only been doing this for 46 years.