Cannot follow Manual Link/sync instructions

[ckraker]

I've been searching the forum for awhile and noticed that all post that have anything to do with link and sync are short and basically say "Get an OEM Manual". Well I used to consider myself mechanically inclined until I stared this process. I do have an OEM Manual for my specific motor (1974 135 HP Evinrude). I cannot for the life of me figure out the order in which I'm supposed to do my link and sync. The major problem seems to be that the control cables, the carb links and the timing link adjustments are all in different sections of the manual.

I got the carb butterflies in sync, but the idle adjustment screw is really throwing me off, because I can turn it all the way in and it isn't adjusting anything at all. Where can I get some step by step instructions on how to adjust all these things? I can use the specs from my manual, but I still need to know an order.
Thanks for any help

 

[Joe Reeves]

Re: Cannot follow Manual Link/sync instructions

Keeping it simple.....

Cam throttle roller adjusted temporarily if needed so that the roller is not touching the cam.

Linkages between carburtors set so that both throttle butterflies open and close at the same time.

Throttle cam roller adjusted so that the throttle butterflies just start to open when the scribe mark on the cam is dead center with the roller.

The above contact (scribe mark/cam roller) should take place when the idle timing is at a specific point (check your manual for that). I believe it is 5? but check your manual.

The adjustment here (if needed) would be the nylon connector on the threaded rod between the long vertical throttle arm and the cam. If you haven't moved that nylon connector, it's very unlikely you'll need to touch that.

That's about it.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1

 

[F_R]

Re: Cannot follow Manual Link/sync instructions

#1 Disconnect the remote control cable and do all adjustments on the motor first. Only after the motor is right, do you install and adjust the cable to fit the motor. Never adjust the motor to fit the cable.

#2 Get both carburetor shafts adjusted so they start to open exactly at the same time. (The link between the two)

#3 Now adjust the sync between the spark advance and carburetor cam. Sorry, I'd have to get the book out myself on that one, so I'll let you do that.

#4 The idle speed stop screw does nothing but control how far you can move the throttle toward "slow". Adjust it so that if you pull the throttle all the way back, you have the desired idle speed. Boat in the water, in gear.

#5 NOW you can install the remote control cable. Adjust the plastic nut so it pulls the throttle lever all the way back to the idle speed stop screw when in neutral.

DO NOT mess with the full spark advance screw unless you are prepared to set the timing. And hope nobody else has.

 

[ezeke]

Re: Cannot follow Manual Link/sync instructions

Agree with F_R, leave the timing alone unless you have the knowledge and equipment to do it professionally.

The full throttle spark advance on the 1974 135HP was 22?. the Throttle pick-up was 4?. Recommended plug was the Champion UL77V surface gap.

See SB #2004, reprinted 10/83.

 

[ckraker]

Re: Cannot follow Manual Link/sync instructions

I have a timing light, and it is possible that the previous owner had changed the timing. The thing that still get me is this.... even with the remote control cable disconnected I can turn that idle screw in all the way and it still won't touch the block. Am I supposed to be adjusting the link that goes into that nylon block between the arm and the cam to get my timing correct?

 

[mrcj001]

Re: Cannot follow Manual Link/sync instructions

#1 Disconnect the remote control cable and do all adjustments on the motor first. Only after the motor is right, do you install and adjust the cable to fit the motor. Never adjust the motor to fit the cable..

I think this is where alot of folks get tripped up. I did when I was learning these outboard beasts. Somthing as simple as the throttle cable being misadjusted can cause alot of grief.



The OEM manual is a little confusing with the syncronization of the engine.

If you follow The above #1 step, your half way there...........

 

[ezeke]

Re: Cannot follow Manual Link/sync instructions

The best way is to follow the tune-up instructions in the manual.

The easiest program is to first make sure that the throttle plates are synchronized and fully closed at idle, then set the cam follower, then adjust the cable to the engine and then, and only then, set the idle.

 

[ckraker]

Re: Cannot follow Manual Link/sync instructions

The best way is to follow the tune-up instructions in the manual.

The easiest program is to first make sure that the throttle plates are synchronized and fully closed at idle, then set the cam follower, then adjust the cable to the engine and then, and only then, set the idle.

I got the plates synced, I got the cam follower set, I then adjusted the cables to fit the motor..... all good so far. But with all that done my idle is low and there is no way to get it higher. Idle screw is all the way in and not hitting anything. What step am I missing?

 

[jtexas]

Re: Cannot follow Manual Link/sync instructions

There's a black thumbwheel where the throttle cable enters the engine compartment...use that to adjust the cable length, to the point where the idle set screw is about half-way in and butted up against its stop.

 

[mrcj001]

Re: Cannot follow Manual Link/sync instructions

I got the plates synced, I got the cam follower set, I then adjusted the cables to fit the motor..... all good so far. But with all that done my idle is low and there is no way to get it higher. Idle screw is all the way in and not hitting anything. What step am I missing?

This pic shows the control lever in neutral at idle, does your engine look like this?



http://forums.iboats.com/attachment.php?attachmentid=12291&d=1210121378

or does it look like this? Note the cam follower position...


http://forums.iboats.com/attachment.php?attachmentid=12297&d=1210121742

 

[ckraker]

Re: Cannot follow Manual Link/sync instructions

There's a black thumbwheel where the throttle cable enters the engine compartment...use that to adjust the cable length, to the point where the idle set screw is about half-way in and butted up against its stop.

Okay I'll give that a try and let you know how it went tomorrow.

 

[ckraker]

Re: Cannot follow Manual Link/sync instructions

This pic shows the control lever in neutral at idle, does your engine look like this?



http://forums.iboats.com/attachment.php?attachmentid=12291&d=1210121378

Man your pictures are great I appreciate you taking the time to post them. That is mechanically exactly what my motor looks like, the differance is that the big vertical arm is always about straight up and down and never tilts back against the idl stop screw, not even with the remote cables disconnected. Is there a problem with my my return spring? Or am I supposed to use the cable trunion nut to put back pressure on it?

 

[ckraker]

Re: Cannot follow Manual Link/sync instructions

This pic shows the control lever in neutral at idle, does your engine look like this?



http://forums.iboats.com/attachment.php?attachmentid=12291&d=1210121378

or does it look like this? Note the cam follower position...


http://forums.iboats.com/attachment.php?attachmentid=12297&d=1210121742

it looks like the second picture, what did you do to make it go back like that? Adjust Cables? Or is there a spring that pushes it back even with the cables off?

 

[mrcj001]

Re: Cannot follow Manual Link/sync instructions

At some time in the engines life, someone may gave messed with the timer base adjustment screw. If the engine is running well at WOT, not overheating and starts easely warm or cold, you can get a longer idle adjustment screw so you can up the idle some. If you do, get stainless steel screw.

Just remember, set the idle were you want it with the throttle cable disconnected, then adjust the cable to fit the throttle lever against the idle stop.

 

[F_R]

Re: Cannot follow Manual Link/sync instructions

You are supposed to be having the cable disconnected while doing the link and sync. So, that has nothing to do with pulling the vertical arm back to the idle stop.

BUT, you are supposed to be pulling it back with your fingers (grab it where the cable does). Are you telling us that it won't move back to that position, like it is stuck or something?

If it physically will move back to the idle screw, the carburetor throttle plates should be completely closed at that point and the motor should be idleing.

I just don't understand what you are saying when you say it won't return to idle position. Are you saying it physically won't go there or are you saying the motor conks out if you do?

 

[ckraker]

Re: Cannot follow Manual Link/sync instructions

It will physically move back to that spot and it will run. but when I stop putting it there myself it springs back to the straight up and down position. Which is where I have been adjusting my cable to fit. So from what you are saying, I should be adjusting my cable to fit with the idle arm screw against the block. As opposed to when it just springs back by itself. Sorry if this is confusing-- thanks for your patience.

 

[F_R]

Re: Cannot follow Manual Link/sync instructions

Hold it back against the idle stop screw and adjust the screw for desired idle RPM.

Then yes, after all adjustments are finalized on the motor, the last step is to install the remote control cable, adjusting it to pull the advance lever back against the stop.

I really don't know what is causing the lever to "spring back" to vertical. The timer base wires must be pulling on it. They shouldn't be. Are they all stiff and hardened?

 

[jtexas]

Re: Cannot follow Manual Link/sync instructions

I believe the throttle lever spring (inside the the throttle lever hub) holds the spark advance lever forward; this is to enable the cable to continue advancing the throttle lever after the timer base has hit its stop.

 

[F_R]

Re: Cannot follow Manual Link/sync instructions

I believe the throttle lever spring (inside the the throttle lever hub) holds the spark advance lever forward; this is to enable the cable to continue advancing the throttle lever after the timer base has hit its stop.

Sure, that is true. But nevertheless, when it is not against the full advance stop, the whole thing moves as a unit, and you should be able to pull it back against the idle stop screw without something tugging at it. Must be the wires.