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  1. #1
    Platinum Member Domush's Avatar
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    Jun 2011
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    Kentucky, US
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    1981 Yanmar 336D

    Default Timing marks for fuel pump timing - Which ones?

    Now that my tractor is running and usable, I am attempting to see if the white smoke issue may be connected to the timing of my fuel pump. The shims for the pump were bent when I bought it, so it may be off a bit (or a lot, who knows).

    What I'm having trouble with is figuring out how the timing marks work on these. I see three sets of two timing marks on the flywheel, each pair with a 1, 2 and 3 stamped next to one of the marks. The service manual goes into detail as to how to check the timing, except it doesn't say which marks should line up.

    Has anyone done this timing check?

    Here is the page from the manual, if anyone wants to see it:



    From complete guessing, when I go to #1 TDC, the bottom mark of the #1 flywheel pair is lined up perfectly. When I crank it until fuel begin to come out, it is between the marks. I have no idea which mark I should be lining it up to. It is retarded or advanced? (I wonder this about myself quite often, too )

    Any thoughts?

  2. #2
    Veteran Member
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    Jun 2010
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    Southern California
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    International Harvester 284, Yanmar 1401D, Yanmar 240, and others...many others...

    Default Re: Timing marks for fuel pump timing - Which ones?

    I have never done this on a diesel engine, so I'm just guessing.

    The manual seems to imply that there are at least two marks: A TDC mark, and an injector timing mark at 25 degrees before TDC. So, if that is correct, the TDC mark will be the second one. Since your pointer is between the marks, that would mean the engine has rotated past the timing mark, so you should pull shims.

    That would also go along with the idea that the bent shims would tend to act as thicker shims, and set the timing later.

    I think.

    Hopefully one of the guys who actually knows what he is talking can help you more, but it seems logical, from far away and through a computer screen...

  3. #3
    Platinum Member Domush's Avatar
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    Kentucky, US
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    1981 Yanmar 336D

    Default Re: Timing marks for fuel pump timing - Which ones?

    That makes perfect sense!

    For some reason I couldn't wrap my head around it.

    Thanks!

  4. #4
    Elite Member
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    Dec 2009
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    gilmer tx
    Tractor
    Bobcat CT235

    Default Re: Timing marks for fuel pump timing - Which ones?

    I am not one of the guys that knows what he is talking about but I agree with 284. Good explanation as usual.

  5. #5
    Gold Member
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    Paarl South Africa

    Default Re: Timing marks for fuel pump timing - Which ones?

    Page starts with no 5 .......where is no 1....to....no 4 ? That will be the prep for this proceedure !

  6. #6
    Elite Member
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    Dec 2009
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    gilmer tx
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    Bobcat CT235

    Default Re: Timing marks for fuel pump timing - Which ones?

    Quote Originally Posted by DLTTrekkers View Post
    Page starts with no 5 .......where is no 1....to....no 4 ? That will be the prep for this proceedure !
    This thread is 5 years old. Are you needing help or just commenting on the pages?

  7. #7
    Super Member clemsonfor's Avatar
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    Sep 2009
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    Greenwood Co., SC
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    Yanmar YM2000

    Default Re: Timing marks for fuel pump timing - Which ones?

    Quote Originally Posted by winston1 View Post
    This thread is 5 years old. Are you needing help or just commenting on the pages?
    haha! I was like Domush pops in the door and now all of a sudden he is retimeing his tractor!!
    YM2000. MF dirt scoop,4' Jbar bushhog,boompole, LMC 12-16 disk harrow, 4' Atlas boxblade (with rippers). 1980 chevy K10,1990 ford ranger 2wd (285K miles),1997 saturn SL2 (twin cam!!),2001Toyota Higlander
    1986 Cobia 177 sunskiff w/1981 Johnson 60 hp
    1991 Javalen 17ft w/same year 150 Johnson GT
    Troybuilt 4 cycle & Echo 2 stroke,cold natured(need carb rebuild),MS390 Stihl, Northern tool pressure washer, mixes water into the oil in the pump(now dead, motor on a tiller). 5000 watt generator.

  8. #8
    Super Member California's Avatar
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    Sonoma County
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    Yanmar YM240, and now just one YM186D

    Default Re: Timing marks for fuel pump timing - Which ones?

    Just in case somebody looks in this thread actually needing an answer about timing - Here's some additional information in a prior thread. Look down around post #19 in that thread.

    http://www.tractorbynet.com/forums/y...xperiment.html

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