Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm)

   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #1  

777funk

Bronze Member
Joined
Jun 2, 2019
Messages
65
Tractor
Yanmar/336D
My L3E had a mouse chew up the air filter and now the compression is low enough it will not start. Time for new pistons and a bore.

Where can I find good quality (hopefully OE quality) pistons for an L3E 3 cylinder diesel?
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #2  
My L3E had a mouse chew up the air filter and now the compression is low enough it will not start. Time for new pistons and a bore.

Where can I find good quality (hopefully OE quality) pistons for an L3E 3 cylinder diesel?
If you replace the chewed air filter, will the tractor compression come back and start?
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm)
  • Thread Starter
#3  
If you replace the chewed air filter, will the tractor compression come back and start?
I wish. Too late now I'm afraid. The cylinders have excessive wear and low compression. I pulled the head and there's a good 0.020" ridge worth of wear. It's no wonder there's only in the high 100s and low 200 psi range on compression.

Thanks mice or maybe paper wasps.

But also thanks to myself for not checking.
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #4  
I wish. Too late now I'm afraid. The cylinders have excessive wear and low compression. I pulled the head and there's a good 0.020" ridge worth of wear. It's no wonder there's only in the high 100s and low 200 psi range on compression.

Thanks mice or maybe paper wasps.

But also thanks to myself for not checking.
Pinned at the top of this section is a PDF file. Look at the last page for the most popular parts suppliers for your machine.
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm)
  • Thread Starter
#5  
I have a little Mits 3 cyl diesel that went from running to not and when I pulled the timing cover, the gears are off by several teeth. How could this happen?
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #6  
I have a little Mits 3 cyl diesel that went from running to not and when I pulled the timing cover, the gears are off by several teeth. How could this happen?
Are you using the YM336 for a working tractor now?
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #7  
I found some pistons (pricey) or can sleeve back to std if & use std pistons. Can supply sleeves
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm)
  • Thread Starter
#8  
I found some pistons (pricey) or can sleeve back to std if & use std pistons. Can supply sleeves

Thanks! I had actually called your shop and spoken with you about this which seems like a GREAT idea.

The problem I ran into is that the machine shop was going to charge $225 to bore (75 a hole) but when I asked about sleeves, the price went up to around a grand to fit. This thing's not worth that much.

The bores are around 0.007" too big in the wear areas. I bought a rigid hone and am going to get the cylinders back to parallel (pretty close after a couple hours work), knurl the pistons, and use next size up rings filed to fit.

I didn't want the project to get too expensive to where it's not worth fixing.
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #9  
Thanks! I had actually called your shop and spoken with you about this which seems like a GREAT idea.

The problem I ran into is that the machine shop was going to charge $225 to bore (75 a hole) but when I asked about sleeves, the price went up to around a grand to fit. This thing's not worth that much.

The bores are around 0.007" too big in the wear areas. I bought a rigid hone and am going to get the cylinders back to parallel (pretty close after a couple hours work), knurl the pistons, and use next size up rings filed to fit.

I didn't want the project to get too expensive to where it's not worth fixing.
With 40yo or more machines, there is a trade-off on what you can afford or not. Wonder if Len has the next size up rings for you.

At least the Yanmar should be in running order for you.
 
   / Mitsubishi L3E 3 cyl diesel Pistons. Where to buy them? Next size up (+0.25mm) #10  
Those are ridicules pricea. My local machine shop is a lot cheaper.
 
 
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