YM336D - Started knocking loud while tilling

Domush · Mar 12, 2012

What a day!

Installed the new liners. I put them in my freezer overnight so the metal would contract. Worked awesome! They slid right in with a 2x4 on top and a few taps of a mallet to seat them on the o-rings. You wouldn't think it looking at them, but those things are heavy.. at ~7-8lbs each.

The pistons went in without issue. Keeping specks of dirt from sneaking into the cylinders and onto the pistons themselves was a job with my horribly dirty workbench.

Ain't she purdy! They come nicely crosshatched already, so I didn't bother de-glazing them. Note the top of the piston.. the previous owner way overtightened the set screw on the compression release and forced the valves into the pistons (all three). Amazingly the pistons survived. I adjusted them back to where they should be and pulling the compression release lever is now easy! It used to take two hands to get it pulled out. Much improved.

All 3 pistons are back in and getting ready to install the head. Funny thing, I didn't want to risk using my cheapo Harbor Freight torque wrench, so I got one on loan from an auto center.. it was a renamed HF one, haha! At least theirs was 1/2" drive, though, so I got it anyhow.

Head is all installed and torqued down. Set the valve clearances, and reinstalled all of the fluids. All that is left is the 4WD shaft.

And the moment you have all been waiting for... a video of the post-rebuild initial start-up!

Til tomorrow!

284 International · Mar 12, 2012

Outstanding! I'm glad it is running. That must be a relief.

Did you end up shimming the springs?

tcartwri · Mar 12, 2012

Domush said:
And the moment you have all been waiting for... a video of the post-rebuild initial start-up!

Til tomorrow!

Clever ! :laughing:

clemsonfor · Mar 12, 2012

All that and you forgot to put the battery on charge while you rebuilt it!! Ohwell its always something!!

Nice job on the reassembly, you will good to go for another 5k hours!

kenmac · Mar 12, 2012

Very nice:thumbsup:

Domush · Mar 12, 2012

For those who didn't watch the video, it never started. The battery was dead, so I have to charge it this morning before I can do the initial start. I'll be starting it for the first time this afternoon.

Car Doc · Mar 12, 2012

Well good it went together nice so now we are all in suspense wondering if the pump and injectors will cooperate least I am! :thumbsup:

tcartwri · Mar 12, 2012

Don't forget to crack the fittings on the injectors a little, or you will be cranking for a looooong time..... Once it's running you can snug them up. :thumbsup:

Domush · Mar 12, 2012

Uhhh, very bad news I think.

It started just fine, I ran it for a bit, then when I went to adjust the idle up to near PTO speed it stalled as though it overheated and the starter was barely able to turn it over more than once (definitely not fast enough to restart it). I pulled the compression release and it turned over seemingly fine. I don't dare restart it, now.

I ran it at 1300 RPMs until the temp reached about 110F. The oil pressure was steady at 57PSI, then gradually went down to ~45PSI as it warmed up.

I also notice there is smoke in the crankcase and it still smoked while running (though not as bad as before the rebuild).

When it was running, I tried to narrow down where what I could only consider the "yammer hammer" noise is coming from (the same noise I heard when it was running fine before the rebuild) and it sounds as though it is coming from between cyl 2 and 3 in the top of the block, but below the head. This is just speculation, though, as I had earmuffs on, since it's a loud engine anyhow. Not sure if that means anything or helps, but figured I'd include it.

What could have happened? Should I be pulling the oil pan to check the bearings? I don't know enough about these things to diagnose these issues

I made a short video of the restart which I'll post on youtube (takes a while to upload) and add it when it's complete. The video ends before the stall out, though.

If you need more info, let me know and I'll answer right away.