JIMTMCDANIELS
Member
Hi looking for experience/advice, I do have experience with cars and have 2 Evinrude manuals I've acquainted myself with!
I've had my 1980 Evinrude Outboard 4V 140hp crossflow 1200 hrs, on my 1982 Sea Sprite SeaHawk 16' open bow trihull for over 2 years and it's running Much better since I've been improving things, BUT still not perfect..
2 things aren't right and I'm not sure what to look into next, perhaps it's all related to one thing I've missed, I've attached 3 short videos to show the engine settings and in operation:
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2 problems:
1. There's an intermittent clicking sound only some at idle in neutral and more so as coming back to idle in neutral, if I manually rev the engine slightly. I can only really hear with the hood off.
This slight clicking seems to go away if I temporarily disconnect the throttle cable and carb butterflies so I can manually retard or advance the timing with the butterflies closed...
2. Engine idle in gear spec is 650 rpm but sometimes it stalls in idle so I have the screw turned all the way in and it's only 800 rpm idle in gear(1200 in neutral).
Seems the idle screw should be able to increase the idle more than that. Maybe this has some to do with the 5,000 feet altitude I'm at.
The engine also sometimes stalls when re-starting after hanging out in a cove for say 45 min. Also then stumbles and dies when trying to get above idle. However if I can get it to full throttle, it runs like a raped ape just great, up to 35 mph, @ 5400 rpm.
I've followed the link and sync exactly. The timing cam picks up right at the short top mark as prescribed. At idle, the timing is already at the 5 deg btdc pickup spec.. The cam follower nylon roller has a very slight gap from the cam. So the butterfly valves just barely open all the way at full throttle with the throttle stop screw turned all the way in.
-
Perhaps:
a. this is some preignition click noise however I don't know why it would go away with advancing the timing, perhaps this means it's getting too much fuel(it does smell over gassy at times)..
b. Or maybe it's piston slap (I have a Buick that has that problem especially when cold but it's just makes it sound a bit like a diesel at first)
c. Or maybe an intermittent missing, although the coils and wires are new, although I did move my timing gun induction to the other three plug wires and the gun light flash can be intermittent on them but when I pull a plug wire completely off, the engine rpm's drop way down.
d. Or maybe the carb floats are too high and giving too much gas.
e. Hoping it's not an internal bearing and since the engine sounds great at WOT, I'm guessing that's not the case.
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Video 1 - shows only throttle cable disconnected and engine idle in neutral with throttle manually advanced and then back to idle, clearly exhibits clicking sound coming back to idle.
https://youtu.be/6dW0G8dFwI0
Video 2 - shows only butterfly valves manually advanced, to show characteristic and sound of engine with only carb advanced.
https://youtu.be/H8Cqcu3zPBc
Video 3 - shows throttle cable and butterfly pickup disconnected, manually advancing timing advance at idle, to show characteristic and sound of engine with only timing advanced.
https://youtu.be/gQ1Xox2RVnY
PS: I'm curious, if anyone knows what the second mark "start" on the cam lobe is used for anything significant?
I'm land locked here in Colorado so I only take it to lakes.
Well thank you Greatly for any Help!
Jim
I've had my 1980 Evinrude Outboard 4V 140hp crossflow 1200 hrs, on my 1982 Sea Sprite SeaHawk 16' open bow trihull for over 2 years and it's running Much better since I've been improving things, BUT still not perfect..
2 things aren't right and I'm not sure what to look into next, perhaps it's all related to one thing I've missed, I've attached 3 short videos to show the engine settings and in operation:
-
2 problems:
1. There's an intermittent clicking sound only some at idle in neutral and more so as coming back to idle in neutral, if I manually rev the engine slightly. I can only really hear with the hood off.
This slight clicking seems to go away if I temporarily disconnect the throttle cable and carb butterflies so I can manually retard or advance the timing with the butterflies closed...
2. Engine idle in gear spec is 650 rpm but sometimes it stalls in idle so I have the screw turned all the way in and it's only 800 rpm idle in gear(1200 in neutral).
Seems the idle screw should be able to increase the idle more than that. Maybe this has some to do with the 5,000 feet altitude I'm at.
The engine also sometimes stalls when re-starting after hanging out in a cove for say 45 min. Also then stumbles and dies when trying to get above idle. However if I can get it to full throttle, it runs like a raped ape just great, up to 35 mph, @ 5400 rpm.
I've followed the link and sync exactly. The timing cam picks up right at the short top mark as prescribed. At idle, the timing is already at the 5 deg btdc pickup spec.. The cam follower nylon roller has a very slight gap from the cam. So the butterfly valves just barely open all the way at full throttle with the throttle stop screw turned all the way in.
-
Perhaps:
a. this is some preignition click noise however I don't know why it would go away with advancing the timing, perhaps this means it's getting too much fuel(it does smell over gassy at times)..
b. Or maybe it's piston slap (I have a Buick that has that problem especially when cold but it's just makes it sound a bit like a diesel at first)
c. Or maybe an intermittent missing, although the coils and wires are new, although I did move my timing gun induction to the other three plug wires and the gun light flash can be intermittent on them but when I pull a plug wire completely off, the engine rpm's drop way down.
d. Or maybe the carb floats are too high and giving too much gas.
e. Hoping it's not an internal bearing and since the engine sounds great at WOT, I'm guessing that's not the case.
-
Video 1 - shows only throttle cable disconnected and engine idle in neutral with throttle manually advanced and then back to idle, clearly exhibits clicking sound coming back to idle.
https://youtu.be/6dW0G8dFwI0
Video 2 - shows only butterfly valves manually advanced, to show characteristic and sound of engine with only carb advanced.
https://youtu.be/H8Cqcu3zPBc
Video 3 - shows throttle cable and butterfly pickup disconnected, manually advancing timing advance at idle, to show characteristic and sound of engine with only timing advanced.
https://youtu.be/gQ1Xox2RVnY
PS: I'm curious, if anyone knows what the second mark "start" on the cam lobe is used for anything significant?
I'm land locked here in Colorado so I only take it to lakes.
Well thank you Greatly for any Help!
Jim