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Old 10-07-2019, 04:15   #1
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Yanmar SB8 clutch control

Yanmar dealer wants me to replace the whole cable but it is just the connection to the engine that is rusted off.It must be possible to just replace the shift shaft?

Regulator idle spring.Dealer ask 200$ Can another spring do?
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Old 10-07-2019, 16:24   #2
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Re: Yanmar SB8 clutch control

Yes Yanmar parts can be unbelievable but they aren't alone in holding you to ransom.
Can you post pictures of the gearbox linkage?. You can certainly use another spring but finding one with the same length & resistance to load will be difficult as it would need to match as I think you are talking about the linkage to the governor. You can work out its resistance by using fish scales & stretching it a fixed distance
Actually if you can post a picture of the spring & it's dimensions that might help as it maybe the same as a ysb8
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Old 11-07-2019, 03:54   #3
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Re: Yanmar SB8 clutch control

Thanks .I cannot copy and paste as usual.
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Old 11-07-2019, 04:13   #4
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Re: Yanmar SB8 clutch control

I have posted the photo on my Facebook page Lionel Cormier.Compas rose icōne.
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Old 11-07-2019, 05:00   #5
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Re: Yanmar SB8 clutch control

Here is the photo from FB.
If you put the pic of the spring on FB, I'll repost it here.
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Old 11-07-2019, 05:47   #6
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Re: Yanmar SB8 clutch control

I have posted photos I already have on my iPad.
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Old 11-07-2019, 17:28   #7
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Re: Yanmar SB8 clutch control

OK, here are the photos of springs the OP is asking about.
They look identical to the YSE8 springs which isn't surprising as the injector pump and governor assembly is the same.
They look OK, why are you wanting another one?
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Old 11-07-2019, 17:40   #8
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Re: Yanmar SB8 clutch control

Are you talking about the small spring or the heavy spring. I have some YSB8 springs but they look a little different. Can you measure the length of the unloaded spring? The springs look ok, what is the problem with it? If the idle is too low just try adjusting the cable.
Not too sure where the problem area of your cable is. Can you post a pic with yr finger pointing to it? If you are talking about the solid bit where it mounts on the end that has broken you could glass it up but tape it first so no resin gets inside the cable.
But you can buy non-Yanmar cables but no idea where in Canada. Google engine control cables
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Old 11-07-2019, 18:49   #9
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Re: Yanmar SB8 clutch control

Making a couple of guesses here but it seems the OP has a low idle issue and is looking for a solution.
After reviewing the photos recently posted, this is my take on the idle adjustment on his SB8. Note, this only how I interpret the arrangement (from the photo), I haven't physically seen this engine and can't find a mention of the idle adjustment in any manuals.

There is no seperate stop function, there is only one cable for the throttle and stop functions.

So I am assuming the photo shows the 'STOP' position. I am assuming there is a compressed spring on the plunger body as noted.

Therefore if the throttle cable is moved so the compressed spring relaxes, the plunger moves to the left and leaves the throttle arm now in the idle position.

Now the idle adjustment can be carried out by turning the idle adjustment nut (after loosening the locknut of course). Moving the nut/body towns the left will increase idle speed. When correct idle is achieved, re-lock the lock nut and confirm the engine will still stop when throttle cable is moved to compress the spring and the plunger is again in the position shown.

There could be other reasons why the idle is rough, faulty injector, fuel issue etc but try the adjustment first.
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Old 11-07-2019, 19:17   #10
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Re: Yanmar SB8 clutch control

sorry Wottie,
I posted my previous post whilst you were posting, see you were onto " what is the problem" concerning springs on throttle. I was guessing it's an idle problem too.
I may be able to help should O.P. need a spring IF they the same as a ysb8

My post was a bit confusing too as the part about broken end of cable was referring to his gearshift cable. I was hoping OP would point to problem part.

Good post re idle adjustment Wottie
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Old 12-07-2019, 04:36   #11
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Re: Yanmar SB8 clutch control

I have added better photos to my FB page.The spring on the left is not always under tension.There is slack in it.At idle the rpm goes up and down.(untage someone says) stalls sometimes.
These photos are at idle.
As for the clutch cable there are many at Stright MacKay in Nova Scotia but will try to epoxy or weld with tin?? Someone suggest.I don’t have my cāble at hand .It is where the tube guiding the cable is crimped to the part on the engine bracket.
P.s.Must find how to add arrows and meaning of O.P.
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Old 12-07-2019, 04:48   #12
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Re: Yanmar SB8 clutch control

Correction.Throtle lever is at stop.
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Old 12-07-2019, 05:35   #13
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Re: Yanmar SB8 clutch control

O.P. = opening post (i.e. first post of the thread) or original poster (i.e. you in this thread).
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Old 12-07-2019, 05:51   #14
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Re: Yanmar SB8 clutch control

Quote:
Originally Posted by copaco View Post
I have added better photos to my FB page.The spring on the left is not always under tension.There is slack in it.At idle the rpm goes up and down.(untage someone says) stalls sometimes.
These photos are at idle.
As for the clutch cable there are many at Stright MacKay in Nova Scotia but will try to epoxy or weld with tin?? Someone suggest.I don’t have my cāble at hand .It is where the tube guiding the cable is crimped to the part on the engine bracket.
P.s.Must find how to add arrows and meaning of O.P.
Quote:
Originally Posted by copaco View Post
Correction.Throtle lever is at stop.
The better photos.
Try the idle adjustment procedure posted earlier (unless others have a better idea).
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Old 12-07-2019, 06:18   #15
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Re: Yanmar SB8 clutch control

Quote:
Originally Posted by copaco View Post
........
As for the clutch cable there are many at Stright MacKay in Nova Scotia but will try to epoxy or weld with tin?? Someone suggest.I don’t have my cāble at hand .It is where the tube guiding the cable is crimped to the part on the engine bracket.
.......
Is it broken where the red circle is?
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