Stuck throttle on my Zip!

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Andy Garrett
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Stuck throttle on my Zip!

Post by Andy Garrett » Tue Dec 04, 2018 7:07 pm

The last time I took out the Zip, the wife and I were at full throttle on Lake Lowell here in Idaho.
When I went to throttle back on my 70s vintage MerControl, it was stuck full open. I damn near ripped it from it's mounting trying to free it.
Eventually, I killed the engine via key as we approached the no-wake zone at the dock. We paddled in.

Before I tear it apart and see what is what in there, has anyone experienced this?
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

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Bill Edmundson
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Re: Stuck throttle on my Zip!

Post by Bill Edmundson » Tue Dec 04, 2018 7:21 pm

Andy

Is the control cable metal?

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

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Roberta
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Re: Stuck throttle on my Zip!

Post by Roberta » Wed Dec 05, 2018 6:21 am

Could be several things, Andy. Check under the hood and make sure all the engine connections are OK and not out of order. I would disconnect the throttle cable from its lever on the motor and try operating the controller with it disconnected. If it works then try operating the lever on the motor to see if it is jammed there. If that's OK, it could be a bad cable or something jammed in the controller.

Roberta
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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Andy Garrett
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Re: Stuck throttle on my Zip!

Post by Andy Garrett » Tue Dec 18, 2018 9:59 pm

Yes it's metal.

Thanks for the tips Roberta. Gonna dive into it in the next few days if plans stick.
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

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Andy Garrett
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Re: Stuck throttle on my Zip!

Post by Andy Garrett » Fri Mar 08, 2019 7:05 pm

I pulled the cowling as Roberta suggested. Nothing obvious--looked real good. Then, I unmounted the throttle quad and opened it up to see if anything obvious was wrong there. I got things moving again and lubed up the componets, but I never identified the culprit. I just blamed it on poor lubrication.

Got it remounted and it locked forward again on the first try.

I'll try again tomorrow, but it got me thinking.
With all the upcoming work and refitting I'm planning for the deck, seats, and other areas--all aimed at adhering to my philosophy of minimum maintenance and maximum reliability, I started thinking of repowering the boat.

I'm very interested in the Evinrude E-TEC 30HP. Anyone have experience with this engine? It gets great reviews and being a two-stroke, 2-cylinder at 150lbs, would reduce my stern weight (and overall weight) considerably. Propped correctly, I would expect to be close to the 34mph I get with the old 50HP Merc.


Penny for your thoughts gang...
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

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Roberta
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Re: Stuck throttle on my Zip!

Post by Roberta » Sat Mar 09, 2019 7:13 am

Could be bad cable, but my bet is the Mercruiser quadrant is jamming. A new motor makes for more trouble free boating, though. I would replace controls, too. Seastar makes nice controls if you don't go matching with your motor.

Roberta
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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Andy Garrett
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Re: Stuck throttle on my Zip!

Post by Andy Garrett » Sat Mar 09, 2019 2:43 pm

Found the problem.
The shifter 'lobe/cam' was grinding in such a way that it caused a sharp angle of metal to fit and lock into a worn groove across the mating surface at the hub.

Now, do I dremmel and lube for now or buy a new quadrant? Hmmm...

This is already my second Mercontrol from that era. I'm not sold on their reliability.

I think I'll look at the one you suggest Roberta.
15521678415962114327189.jpg
15521678877431431208333.jpg
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

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Bill Edmundson
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Re: Stuck throttle on my Zip!

Post by Bill Edmundson » Sat Mar 09, 2019 3:22 pm

Andy

I think I'd go for a new one.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

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Andy Garrett
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Re: Stuck throttle on my Zip!

Post by Andy Garrett » Sat Mar 09, 2019 5:07 pm

The Seastar wouldn't quite fit my boat.
The Uflex vintage type dual lever was a favorite back when I was building. Can't recall why I went with the Mercontrol.
It just seems like it would be simpler and thus, more reliable.
It should be a direct connect if my cables are cc179s like I think they are.
controls.jpg
But, what would I do with the ignition, electric choke, etc? Hmmm...

Or...
new motor altogether... $$$$
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

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hoodman
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Re: Stuck throttle on my Zip!

Post by hoodman » Sat Mar 09, 2019 9:48 pm

If your engine is otherwise in good shape and reliable it's hard to justify a new one when you only need a new control.

However, it is really nice to be able to bump the key and have an immediate start with zero smoke and quiet operation. How much does your current.engine weigh?
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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Andy Garrett
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Re: Stuck throttle on my Zip!

Post by Andy Garrett » Sun Mar 10, 2019 12:56 am

Current mill weighs 175.
It doesn't do a great job of pulling fuel from way up under the bow. I have to pump the bulb regularly.
It's also 42+ years old.
You are right though. It works. It even has a new pig tail.
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

Hercdrvr
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Re: Stuck throttle on my Zip!

Post by Hercdrvr » Sun Mar 10, 2019 3:07 am

Having fussed with an old outboard it’s easy for me to let this conversation drift from throttle quadrant repair to new engine specifications. A new 150 lb. 30 horse Etec would be sooo nice on your Zip. It comes down to one thing.....$$$$$, new outboards ain’t cheap but worth every penny.
Good luck,
Matt B

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Roberta
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Re: Stuck throttle on my Zip!

Post by Roberta » Sun Mar 10, 2019 5:19 am

Sell some of those beautiful knives and get a new(er) motor, harness, and control. :D

Roberta :D :D
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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hoodman
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Re: Stuck throttle on my Zip!

Post by hoodman » Mon Mar 11, 2019 4:25 pm

Did you build your transom for a 20" shaft?
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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hoodman
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Re: Stuck throttle on my Zip!

Post by hoodman » Tue Mar 12, 2019 4:51 pm

I just came across this about Ted Gauthier's zip. He has a 45 hp four stroke on his: http://tedsbuild.blogspot.com/
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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