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11-07-2020, 18:03
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#1
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Registered User
Join Date: Apr 2010
Location: Nova Scotia / Mexico
Boat: CMPF Trisbal 36 / Beneteau Ocenais 510
Posts: 148
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Where is kill switch attach on Yanmar 2QM20
Hi
I've a new to mew C&C 34 with Yanmar 2QM20 diesel engine. The "kill switch" is a pull knob on by the engine control panel. I was stuck and I found the other rend laying on the starter side of he engine. There looks to be a place aft of the throttle lever for it. Look slike when one reduces power the throttle lever arm hits a piston on a spring abd is kicked back to the low RPM position. Looks like when one pull the kill switch, the spring loaded rod on the engine end is retracted and allows the throttle lever back to what I assume is a fuel cut off position,
Is this correct?
__________________
Listen to that little inner voice. Now!
My simple rule for sailing and maintenance: "Thought of it - do it now, else it's only gonna get worse".
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12-07-2020, 05:54
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#2
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Registered User
Join Date: May 2015
Location: Muskegon, Mi
Boat: Columbia 36
Posts: 1,201
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Re: Where is kill switch attach on Yanmar 2QM20
Sounds right. Not familiar with that model but the shut down is usually next to or coaxial with the speed control lever. The shut down lever moves the governor farther than the speed control can therefore shutting off all fuel to the injector pump.
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12-07-2020, 06:27
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#3
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Moderator
Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 6,083
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Re: Where is kill switch attach on Yanmar 2QM20
I'm not familiar with that one, either, but there are really only two ways of shutting down a diesel, stop fuel or stop air, since there is not the third alternative in gasoline engines, shut off the spark. Normal cut off is fuel, but close enough to the injectors that you don't lose prime for the next start. Cutting off air is left for run-away Detroit Diesels, which have been known to suck their gaskets when the plate slams across the intake.
I like your tag lines, Krazy. My alternative is "Think of it, write it my pocket notebook."
__________________
Never let anything mechanical know that you are in a hurry.
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12-07-2020, 07:20
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#4
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Moderator
Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 6,083
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Re: Where is kill switch attach on Yanmar 2QM20
Here's the Owner's manual. It's pretty clear that the engine shuts down by constricting fuel flow below the idle level. Sorry the PDF is too big for me to attach it here.
https://www.yanmarshop.com/Media/Def...124790-2E).pdf
__________________
Never let anything mechanical know that you are in a hurry.
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12-07-2020, 08:43
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#5
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Registered User
Join Date: Sep 2010
Location: Boat in Greece
Boat: Lagoon 400
Posts: 1,430
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Re: Where is kill switch attach on Yanmar 2QM20
You can try the setup by attaching a piece of string to the place were you think the cable should be connected.
Start the engine and then pull on the string emulating the action of the cable.
If engine stops you have it...
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Mark, S/Y Bat-Yam
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12-07-2020, 09:29
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#6
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Registered User
Join Date: Dec 2014
Location: Daajing Giids, Haida Gwaii, B.C.
Boat: Peterson 35
Posts: 121
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Re: Where is kill switch attach on Yanmar 2QM20
Hi, Krazy,
My engine is the same model, and the manual says to shut it down by throttling back entirely. Works like a charm instantly. Gotta love simplicity.
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12-07-2020, 09:34
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#7
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Registered User
Join Date: Nov 2017
Location: Portland, Oregon USA
Boat: Island Packet, Packet Cat 35
Posts: 955
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Re: Where is kill switch attach on Yanmar 2QM20
Quote:
Originally Posted by meirriba
You can try the setup by attaching a piece of string to the place were you think the cable should be connected.
Start the engine and then pull on the string emulating the action of the cable.
If engine stops you have it...
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My cable needs to be replaced. To shut down I simply push the lever back until the engine stops. Make sure you have good light to see and no loose clothing. I've had to do this on quite a number of different engines over the years. If the engine won't start and it's not an out of fuel situation the 1at thing I check us the cut off by tapping it gent lo y to the run position. I've had boats that would not start even tho the lever was in the correct position eyeballing it.
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12-07-2020, 10:18
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#8
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Registered User
Join Date: Jul 2016
Location: Waldron, WA
Boat: Cape Dory 25D
Posts: 36
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Re: Where is kill switch attach on Yanmar 2QM20
Quote:
Originally Posted by tkeithlu
I'm not familiar with that one, either, but there are really only two ways of shutting down a diesel, stop fuel or stop air, since there is not the third alternative in gasoline engines, shut off the spark. Normal cut off is fuel, but close enough to the injectors that you don't lose prime for the next start. Cutting off air is left for run-away Detroit Diesels, which have been known to suck their gaskets when the plate slams across the intake.
I like your tag lines, Krazy. My alternative is "Think of it, write it my pocket notebook."
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Actually, there is a third way;it's called a "compression break" (not to be confused with "compression brake"). A lever holds the intake valves from closing completely. No compression, no ignition, engine stops.
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12-07-2020, 11:24
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#9
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Registered User
Join Date: Feb 2020
Location: Lymington UK
Boat: UFO27 Holman & Pye 8.2m
Posts: 259
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Re: Where is kill switch attach on Yanmar 2QM20
It is useful to have these quick disconnects - one example here
https://www.gaelforcemarine.co.uk/en...SABEgKoVvD_BwE
(a UK supplier), so if a cable breaks or jams someone can control the throttle and ahead/astern by hand
John
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12-07-2020, 11:38
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#10
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Registered User
Join Date: May 2020
Location: Pago Pago
Boat: Lancer 36
Posts: 265
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Re: Where is kill switch attach on Yanmar 2QM20
OP, you have the correct concept of the operation; the parts manual shows the correct parts so you can see if anything is missing. I have the same engine, but a previous owner changed the engine controls to a dual lever, so the system no longer works as intended...I have to be careful in low speed manuevering not to kill the engine by throttling back too much. https://www.lsm-diesel.dk/2012/yanma...qm20-3qm30.pdf
Using the compression release to stop the engine is advised against in the service manual as it can cause damage.
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12-07-2020, 12:03
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#11
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Moderator
Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 6,083
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Re: Where is kill switch attach on Yanmar 2QM20
."I have to be careful in low speed manuevering not to kill the engine by throttling back too much."
Amen. That's why for docking and getting around a marina I set the throttle at near idle and leave it alone. Use the gearshift only. Ever seen someone lurching around the marina gunning the throttle?
__________________
Never let anything mechanical know that you are in a hurry.
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12-07-2020, 16:49
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#12
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,305
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Re: Where is kill switch attach on Yanmar 2QM20
Please note the 2QM20H has a slightly different engine stop arrangement than the other versions of the 2QM20 i.e. the B, F, Y etc.
The H has a separate engine stop cable incorporated into the idle adjuster. The other versions simply require the throttle to be further retarded (against a spring in the idle adjustment).
I have seen both versions modified by owners to the other version...
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All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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12-07-2020, 19:13
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#13
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Registered User
Join Date: Jul 2016
Location: Waldron, WA
Boat: Cape Dory 25D
Posts: 36
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Re: Where is kill switch attach on Yanmar 2QM20
Quote:
Originally Posted by OloteleMtn
OP, you have the correct concept of the operation; the parts manual shows the correct parts so you can see if anything is missing. I have the same engine, but a previous owner changed the engine controls to a dual lever, so the system no longer works as intended...I have to be careful in low speed manuevering not to kill the engine by throttling back too much. https://www.lsm-diesel.dk/2012/yanma...qm20-3qm30.pdf
Using the compression release to stop the engine is advised against in the service manual as it can cause damage.
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Granted; on the engines I used to work with, this was basically an e-stop measure should the engine run away due to a governor malfunction. Upper valve damage beats having the engine tear itself apart.
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03-05-2021, 02:47
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#14
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Registered User
Join Date: May 2021
Posts: 1
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Re: Where is kill switch attach on Yanmar 2QM20
Hi!
Swedish sailer here :-)
I bump this thread, cause it really seems like you guys know 2qm20´s.
I have a 2qm20H in my 36 ft sailingboat. I have the lever control with to arms (one for the gear and one for the throttle). This is killing me, I can´t really live with the way of handling the lever control. I am so near of killing the engine everytime I try to find a working idle when changing gear. And I don´t want any crash to happend beacuse of this.
I have asked a bunch of guys here in sweden if it is possible to change the lever control to a single one. The 2qm20H seems to have a special wire to kille the engine not only that you pull the idle to zero this wire has to be pulled. That makes me wounder if it´s possible to change to a single lever control and connect the wire for killing the engine to some sort of knob.
Excuse me of bad english :-)
Best regards
Linus, Kolmården
Sweden
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03-05-2021, 02:48
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#15
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Registered User
Join Date: May 2021
Posts: 1
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Re: Where is kill switch attach on Yanmar 2QM20
Hi!
Swedish sailer here :-)
I bump this thread, cause it really seems like you guys know 2qm20´s.
I have a 2qm20H in my 36 ft sailingboat. I have the lever control with to arms (one for the gear and one for the throttle). This is killing me, I can´t really live with the way of handling the lever control. I am so near of killing the engine everytime I try to find a working idle when changing gear. And I don´t want any crash to happend beacuse of this.
I have asked a bunch of guys here in sweden if it is possible to change the lever control to a single one. The 2qm20H seems to have a special wire to kille the engine not only that you pull the idle to zero this wire has to be pulled. That makes me wounder if it´s possible to change to a single lever control and connect the wire for killing the engine to some sort of knob.
Excuse me of bad english :-)
Best regards
Linus, Kolmården
Sweden
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