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  1. #1
    Platinum Member Domush's Avatar
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    Jun 2011
    Posts
    849
    Location
    Kentucky, US
    Tractor
    1981 Yanmar 336D

    Default YM336D - Started knocking loud while tilling

    I feel like an idiot. I spent well over a month fixing this tractor and getting it to where I could use it. I borrow a tiller from a neighbor for my garden, start tilling (1st time using a PTO implement!) and after the first row, it begins knocking loudly. I check the oil, and it is barely registering on the dipstick .. I ran it low on oil..

    I noticed the oil pressure gauge read only 10PSI before I shut it down, where it normally reads 50PSI. This can't be good.

    I pushed it back into its parking spot and will begin tearing into it tomorrow.

    Until then.. anyone have any guesses as to what the knock is? This is the first time I've been this stupid with an engine. I even thought about checking the oil when I started it this morning, but figured I ran it so rarely it wouldn't matter (I have maybe 10 hours on it since I changed the oil). It smokes a good amount, but I though that was diesel, not oil getting pushed out.

    336D restoration thread #3, I guess.
    It is the mark of an educated mind to be able to entertain a thought without accepting it. ― Aristotle

    Yanmar 1981 YM336D

    From this . . . . To this
    ...

    Check out the full restoration project: Part 1 - Part 2 - Part 3 . . . . Adding gauges? How-to

  2. #2
    Silver Member
    Join Date
    Oct 2002
    Posts
    110

    Default Re: YM336D - Started knocking loud while tilling

    Domush

    I feel for you. I hope it is an easy fix.

  3. #3
    Platinum Member Neat 1500's Avatar
    Join Date
    Aug 2009
    Posts
    576
    Location
    Melbourne,Australia
    Tractor
    Yanmar YM1500 Red & YM14 MkII

    Default Re: YM336D - Started knocking loud while tilling

    hopefully you got it before any major damage was done, if it was really that low and pressure was down it may have spun a bearing
    Paul YM1500 & YM14 MkII

  4. #4
    Veteran Member
    Join Date
    Dec 2009
    Posts
    2,437
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: YM336D - Started knocking loud while tilling

    Most likely would be a rod bearing but sure can't know that.

  5. #5
    Super Member clemsonfor's Avatar
    Join Date
    Sep 2009
    Posts
    6,147
    Location
    Greenwood Co., SC
    Tractor
    Yanmar YM2000

    Default Re: YM336D - Started knocking loud while tilling

    Man i hate to hear that! I know how much work you put into this thing, after following your posts.

    This is a good reminder to me to check my oil which i almost never do on stuff as much as i should, i just think well its never really been low before.
    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.

  6. #6
    Elite Member Car Doc's Avatar
    Join Date
    Mar 2009
    Posts
    3,246
    Location
    Kansas
    Tractor
    YM3810D Yanmar

    Default Re: YM336D - Started knocking loud while tilling

    If it was ran low on oil the knock will be bad bearings and that almost 100% always ruins the crank so pulling the whole engine is necessary there to get the crank and cam out and pray it didn't spin a main.

    You can pull the oil filter and tear it down (grind the rolled edge off at the top and pull the guts out and spread them out) or pull the pan and see bearing material or even see it in the drain oil you have major issues guaranteed.
    Yanmar YM3810D, LT duty 3pt hoe, 6' KK2 tiller, 6' KK box blade, 6 1/2' KK disc, 5' Howse bush hog, 5' Howse back blade, 9" Yellow PHD, 3 Husky chain saws 346XP NE, 359, 372XP. 07 HD Heritage Softail, Crack injectors, check compression, take 2 beers and call me. "Hey you didn't build that."

  7. #7
    Platinum Member Smoody's Avatar
    Join Date
    May 2008
    Posts
    612
    Location
    South Carolina
    Tractor
    YM226D

    Default Re: YM336D - Started knocking loud while tilling

    Reading this made me cringe. I don't always check mine before use either, I know I should and now will remember this thread if I don't.
    YM226D w/YFL800 Loader

  8. #8
    Gold Member
    Join Date
    Jan 2012
    Posts
    422
    Tractor
    YM2000

    Default Re: YM336D - Started knocking loud while tilling

    Everytime it sat overnight for me. Look at the Overflow Bottle and check the Hyd. Fluid also. Just not worth a couple Min. not to

  9. #9
    Elite Member Car Doc's Avatar
    Join Date
    Mar 2009
    Posts
    3,246
    Location
    Kansas
    Tractor
    YM3810D Yanmar

    Default Re: YM336D - Started knocking loud while tilling

    If you guys ever worked for someone operating equipment you would already be in the habit.
    Yanmar YM3810D, LT duty 3pt hoe, 6' KK2 tiller, 6' KK box blade, 6 1/2' KK disc, 5' Howse bush hog, 5' Howse back blade, 9" Yellow PHD, 3 Husky chain saws 346XP NE, 359, 372XP. 07 HD Heritage Softail, Crack injectors, check compression, take 2 beers and call me. "Hey you didn't build that."

  10. #10
    Gold Member
    Join Date
    Jan 2012
    Posts
    422
    Tractor
    YM2000

    Default Re: YM336D - Started knocking loud while tilling

    Had to look back alot of times to see how much I had left.

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