yanmar ym 2000 won't start

kenmac · Oct 9, 2006

Those metal shavings are likely throughout the engine . you'll need to clean out the metal that hides in those small oil passages. the best way to clean is to have machine shop put the block in a block cleaner. Oil pump gears are probably eaten up , cam bearings ,etc, Usually if you spin a crank bearing something has to be done with that crank journal . Like mark said. Do it right the 1 st time around.I think danny posted somewhere that he has a yanmar in his shop at this time with a spun bearing.You have alot of work ahead , good luck

normde2001 · Oct 9, 2006

garyd said:
Well the bad news is in, I've pulled the head off and dropped the pan off the block. I should have noticed the fine metal on top of the head when I adjusted the valves, didn't see it didnt want too I suppose. The top of the front piston #2 has the the imprint of the head on it. rod bearing spun its all most gone. The crank shaft journel looks bad too. I dont know what should be done next, If it were a pickup or a car it would be a complete tear down and rebuid as the metal of the bearing has run through the motor. One good thing the cyclinder liners look good. I dont know why the bearing failed.What do you guys think I should do next? Tear the motor down the rest of the way pull the crank see if it can be turned? Can you get over sized bearings? Thanks for the input.
Gary<><

Luckily you are talking about a 25- 30 year old, $2500 tractor and not a $50,000 Mercedes. No need to spend $1,500-$2,000 on engine repairs. If it were mine, and I found no Crankshaft damage, (transferred bearing material can be removed with pool acid and steel wool), I would check both pistons and rods for damage, and order/replace parts as necessary, otherwise, replace rings and rod bearings and get on with my life.

kenmac · Oct 9, 2006

only My opinion but, If you'er going to keep the tractor for a long time I would do it right the 1 st. time around and not worry about cost. If you'er only going to keep the tractor for short term go the cheap route on repairs or, talk to a dealer about a trade in . If you are in need of a little larger or newer tractor , now may be the time to shop.

greatrandini · Oct 10, 2006

It would be a hard decission for me.. If you only use it 50-100 hrs a yr u may just want to get it going again and hope for the best.....

garyd · Oct 13, 2006

normde2001 said:
Luckily you are talking about a 25- 30 year old, $2500 tractor and not a $50,000 Mercedes. No need to spend $1,500-$2,000 on engine repairs. If it were mine, and I found no Crankshaft damage, (transferred bearing material can be removed with pool acid and steel wool), I would check both pistons and rods for damage, and order/replace parts as necessary, otherwise, replace rings and rod bearings and get on with my life.

Norm
What kind of acid is pool acid, muratic acid?
What about nutralizing the acid so it dos'nt etch the journel? baking soda and water?

garyd · Oct 14, 2006

Inspector507 said:
I wonder if that is related to your low oil pressure problem last year.

Inspector507
Hello
A buddy of mine said that as bearings wear away oil pressure drops is that what you mean? I wonder if the motor has been going since I got it. Some of the first posts were How I thought the thing Knocked(pounded!) Thats the yannie hammer or some thing to that effect. Well in any case thats been 3 years or so and I have got a lot of work out of it that way, hinde site is 20/20 my fore site not all ways so good.
Gary<><

greatrandini · Oct 14, 2006

Gary once u get her goin again u'll feel more confident in knowing u can keep her goin forever cuz u now know how to fix her.... parts is parts and mind over machine.....

normde2001 · Oct 14, 2006

garyd said:
Norm
What kind of acid is pool acid, muratic acid?
What about nutralizing the acid so it dos'nt etch the journel? baking soda and water?

Right on both counts.

garyd · Dec 10, 2006

Hello TBN

Well the the report is in from the machine shop on the crank. The crank is worn out of spec. 45 thousands to be exact. I think the bearings are only available 10 and 30 thousands over. I don't think I want to put a $500 crank in a worn out motor, if I was to do that it would all have to be new to do it right. I just don't understand the cost of the parts. $1500-$2000 to rebuild a 2 lunger? Maybe I can part the tractor out. or find a good used motor.Maybe another used tractor. You guys got any thoughts.
Gary<><

California · Dec 10, 2006

Several dealers who post here have boneyards. If nobody offers an engine, then watch ebay for a 2Q series sailboat engine. I think it's the same basic engine as the 2TR20A-X in a YM2000, but with different manifolds and other external parts. I've seen some go through cheap that hadn't run for a while.

Verify that I am correct before spending any money!

kenmac · Dec 10, 2006

There are places that will weld your crank up & turn it back down. I know this is done in the race car circuit I'am sure they could do it on a tractor crank. However, this is also expensive. I wouldn't want to run a crank that has been turned more than 20 thousands. Sorry to hear the news is so bad. good luck

normde2001 · Dec 10, 2006

garyd said:
Hello TBN

Well the the report is in from the machine shop on the crank. The crank is worn out of spec. 45 thousands to be exact. I think the bearings are only available 10 and 30 thousands over. I don't think I want to put a $500 crank in a worn out motor, if I was to do that it would all have to be new to do it right. I just don't understand the cost of the parts. $1500-$2000 to rebuild a 2 lunger? Maybe I can part the tractor out. or find a good used motor.Maybe another used tractor. You guys got any thoughts.
Gary<><

I would try a different machine shop. You should be able to get it reworked for about $150. Here is a place in Ga. that advertises regrind on a 2 cyl. John Deere crank for $150.

kenmac · Dec 11, 2006

if the crank is wore out of specs.45, then, you would need to have it turned another .10 to be sure it's straight.(you wouldn't want to put an egged crank in a new rebuilt motor.) now ,you are looking at .50 & I ( my opinion) wouldn't do it. This engine has too much compression for this . You may end up with a broken crank in a new engine

.There was a guy on here a while back that was looking for a crank.He bought a crank from fredricks. He had a 3110 tractor. Good luck !

greatrandini · Dec 12, 2006

I just looked. Crank shaft new is $498.00 from Hoye.

California · Dec 21, 2006

Gary, here's your replacement engine on ebay!

eBay Motors: YANMAR TRACTOR 2 CYL DIESEL ENGINE SOUTH MISSOURI (item 130061453542 end time Dec-27-06 17:31:54 PST)

He says it was on a truck that rolled so the exterior parts are bent. That should be a good core to hang your accessories on.

He's parting out a whole YM240D (YM2000D) so there's a 4x4 front axle etc - click on 'View seller's other items' but note that every auction describes substantial crash damage.

HGM · Dec 21, 2006

I know I'm way late on diagnosis(for some reason I missed this thread earlier).. But, the key to the diag was vapor puffing out of the crankcase or oil fill when it was running.. Absoloutely had to be compression, thats what caused the pressure in the crankcase.. The freind that suggested the air test through the injector hole had it right. Blowing air in the combustion chamber(you may need to rotate the crank to close the valves, if possible) then listening at the exhaust pipe, intake, and oil fill(or breather) will tell you where your compression is leaking..

Sorry not to add this earlier, but maybe it will help future diag for others

.. Why no one else mentioned it, well its easy to miss something on a thread, I'm sure many here would have had the same recomendation.. This place is a GREAT resourse for Yanmars..

Back to your problem Gary.. I would try contacting the dealers on here directly(though they have probably seen the thread and cant help) to see if they might have a used crank laying around or leads on one(maybe a "recon" dealer that cant rebuild a particular tractor

).. Then maybe as a last resort, if I couldnt find a used one anywhere(after lots of looking) I would have it welded and turned.. It should be fine... Its alot of work, but bottom line is you have to decide what the tractor is worth to you, how much do you want to spend? If you can live without it for a while and that engine on E-bay doesnt pan out, just keep looking.. Good luck..

garyd · Dec 23, 2006

California
Thanks for the heads up on the motor. Boy do I miss my tractor, we got about 4" of snow over night. AS to what the tractor is worth.....MORE as the snow gets deeper! I only paid 2700.00 for the tractor, with the crank shot and the rest of internals more than suspect. I am the type to replace everthing.The costs to replace everthing plus the machine work, it gets close to the original price. I guess Iwould know what what I've got. I don't get rid of things just hang on to them. I really enjoy this place and appreciate all of you! Have a safe and MERRY CHRISTMAS!
Gary<><

garyd · Jan 27, 2007

California
I did buy that ym 240 motor on e-bay last month, but the trucking broker I found and hired is giving me the run around. My motor is still setting on a truck dock in west plains Missouri. It was been over 3 weeks! I have paid for the motor and the shipping and there it sets. The guy I bought it from as been very helpful, but the trucking broker is suspect"discount freight"I am at a loss. Hopefully they can get it picked up and headed this way, it just seems way too long to wait.