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1977 115HP Trunnion Slipping

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nicklanigan

Contributing Member
Hi all.

My boat struggled to get into gear last week - it appears that the trunnion is slipping - just want to confirm that this is not normal - shown at the start in the following video:

https://youtu.be/IGhTcWHDqac

I'm assuming there is not meant to be any play at all?

My first thought was to replace the cables (inc trunnion), however, the new ones, whilst having slightly less play, still slip a great deal, so I'm guessing the receiving part needs to be replaced.

Appreciate input,

Thanks,

Nick.
 
Where is the plate that is supposed to hold that thing in place? I don't know if that would be all it needs or not. Probably not. I'm guessing the "receiving part" as you call it is badly worn. I'm surprised, never saw one worn like that.
 
It's because you're missing the clamp block plate that holds the trunion in place. Look on this diagram and you'll see part #'s 34 and 37 for the plate and screw. The plate pinches against the trunions for the shift and throttle cables and keeps them captive in the detent of the anchor block.

http://www.marineengine.com/parts/j...manufacturer=Evinrude&section=Intake+Manifold

trunsion_diagram.JPG
Here is your setup from the video:
trunion_NOplate.jpg

And here is how it should look:
trunion_plate.jpg
 
Thanks guys.

I do have the clamp - it was just removed for the video.

The clamp just stops sideways movement of the trunnions - it doesn't stop the fore/aft slippage which is the problem.

Marine engine has the intake in stock (on this model, the receiver for the trunnions is part of the intakr), so have ordered it.
 
Just to close this out in case any one comes looking - yip, the receiver part for the trunnions was far too worn.

On this motor, the air intake needed to be replaced - thankfully looks like I got the last one from marine engine.

Problem completely sorted. Thanks ME!
 
In my 30+ years on the job, I encountered that one time... on the water during a test run, and of course no replacement parts of that magnitude.

A bit of electrical tape wound around that trunion... reinstall the clamp plate... problem solved. Patch job I know, but there are times whne it's a necessary evil. And, as long as the owner is aware, it is acceptable.
 
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