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Old 15-03-2011, 10:01   #1
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Throttle Adjustment on a Three-Cylinder Yanmar

I'm looking for articles, with schematic and drawings if possible, on the way to adjust the course of the throttle wire on my Yanmar 3HMF engine.
Due to the space available (or the lack of it) I cannot see the course of the throttle wire between the handle to the engine lever.
And I don't know how to proceed exactly.
Anybody can help me find this?
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Old 15-03-2011, 19:25   #2
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

what are you trying to achieve?
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Old 15-03-2011, 19:34   #3
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

If I understand your question, you don't need a schematic for the routing of the throttle cable. Run it where you want it and call it good.
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Old 15-03-2011, 19:42   #4
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

Cable routing is unique to each model of boat..... avoid sharp bends and you're good-to-go
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Old 16-03-2011, 07:21   #5
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

OK Thanks.
I think the throttle wire is too short and don't let the handle get all the way and reach higher rpm.
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Old 16-03-2011, 07:25   #6
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

Possibly interference between the engine box cover and the lever? I have a similar problem with the shut down cable
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Old 16-03-2011, 07:42   #7
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

The throttle cable may have gross adjustment at the throttle block. The throttle arm may have a few holes in it and the cable can have gross adjustment by attaching it in one of those holes along that arm.
Had this problem on one of the boats I operated. Went down and corrected it myself. Worked great from then on.
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Old 16-03-2011, 16:48   #8
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

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Originally Posted by Alecadi View Post
OK Thanks.
I think the throttle wire is too short and don't let the handle get all the way and reach higher rpm.
what you are thinking is nearly impossible.

Please give us the full symptoms your experiencing.
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Old 17-03-2011, 06:45   #9
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

Look at the connections near the engine. You may find a it had had a Governor type fitting placed on it to prevent its ability to move past a fixed amount. Some Charter boats set these to prevent the typical charter operator from running engine Wide Open as soon as they get on the boat.

Problem often is, if you remove it, you may weaken the actual line as they are typically rusted into place after a few years. You may have to replace the cable if too much damage occurs.

I hate the damn things but have seen several on local boats. Most seem to have been placed on by the Owners and not the charter companies.
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Old 17-03-2011, 13:04   #10
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

To all: Thank you so much for all comments and advice.

To never Monday:
The problem is the engine cannot get to max rpm.. the engine is rated at 3400 and even on neutral (no load) I cannot get further to 2200 rpm. The engine sound great, water coolant is OK, raw water OK, oils is clean and new .. etc but full throttle we get only 2200.

We are looking to see if it's a wire problem between the handle and the engine lever.
Apparently after checking it again yesterday the wire is ok...

After all those check the last thing is to call a Yanmar dealer specialist.. and hope for the best :-(
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Old 17-03-2011, 13:17   #11
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

Ummmm......how about just disconnecting the cable from the engine and pulling the lever with your fingers. If it still doesn't get to 3400 in neutral, beg borrow or plead a photo tach to check your yanmar tach.
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Old 17-03-2011, 14:43   #12
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

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Originally Posted by Sailmonkey View Post
Ummmm......how about just disconnecting the cable from the engine and pulling the lever with your fingers. If it still doesn't get to 3400 in neutral, beg borrow or plead a photo tach to check your yanmar tach.
ditto.
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Old 17-03-2011, 15:11   #13
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

Quote:
Originally Posted by Alecadi View Post
To all: Thank you so much for all comments and advice.

To never Monday:
The problem is the engine cannot get to max rpm.. the engine is rated at 3400 and even on neutral (no load) I cannot get further to 2200 rpm. The engine sound great, water coolant is OK, raw water OK, oils is clean and new .. etc but full throttle we get only 2200.

We are looking to see if it's a wire problem between the handle and the engine lever.
Apparently after checking it again yesterday the wire is ok...

After all those check the last thing is to call a Yanmar dealer specialist.. and hope for the best :-(
your next check should be the exhaust elbow. I really don't care how much water is coming out. Pull the hose off and look at it.
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Old 18-03-2011, 12:08   #14
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

"disconnecting the cable from the engine and pulling the lever with your fingers."

Went there done that... to no effect.
Will check the gauge as soon as I can get a photo tach. Thanks Guys.

Never Monday: Can you explain further? The exhaust elbow is new. Was changed a few month ago. What should we look at? Thank you.
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Old 18-03-2011, 16:09   #15
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Re: Throttle Adjustment on a Three-Cylinder Yanmar

Quote:
Originally Posted by Alecadi View Post
"disconnecting the cable from the engine and pulling the lever with your fingers."

Went there done that... to no effect.
Will check the gauge as soon as I can get a photo tach. Thanks Guys.

Never Monday: Can you explain further? The exhaust elbow is new. Was changed a few month ago. What should we look at? Thank you.
if advancing the throttle with the cable disconnected doesn't change the symptoms. AND you have replaced the mixing elbow as you said. That leaves a few things.

Does it smoke when you advance the throttle?
what color?
Hows the bottom?
what kind of prop?
when was the last injector service?
can you turn the engine 2-3 revolutions buy hand?
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