Yanmar L100V Help Request

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CallMeColt

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Wilson County, Texas
So, I got a renewed motivation to get this thing to run again.

Checked everything again. Then once more. Removed the head & everything looks good in there as well.

No way to pressure test but in the last week of reading things on people repairing these Yanmar L-series engines & the 186 type clones, the fact that I can't pull past the compression stroke means I'm okay.

I've narrowed it down to needing the lap & clean the valves & seats.

I also found a TON of very good information & manuals on this engine. The files are to large to upload unfortunately.

Will report back when I get the work done. Need to order some things.
 

snowtrac nome

Well-known member
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western alaska
A bunch of dredgers tried those to run suction dredges up here they found if they weren't able to get a proper load on them the valves would carbon up and the motor would do just what you described i would look at intake and exhaust chambers and see if they are restricted with carbon. On larger engines i have seen restricted mufflers do this to.
 

CallMeColt

Active member
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Location
Wilson County, Texas
So, I spent a full day yesterday trying to get this thing running again with no luck.

Removed the whole top end & cleaned everything in a parts washer. Lapped the valves. Re-checked everything. No luck!

Disassembled the injector successfully this time. Cleaned the inside of it & tested. All was good. Still no difference in it running.

I'm at such a loss!
 

jeffhuey1n

SMSgt, USAF (Ret.)
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So, I spent a full day yesterday trying to get this thing running again with no luck.

Removed the whole top end & cleaned everything in a parts washer. Lapped the valves. Re-checked everything. No luck!

Disassembled the injector successfully this time. Cleaned the inside of it & tested. All was good. Still no difference in it running.

I'm at such a loss!

Kudos for your continuing efforts. Never let the machine know it’s kicking yer buns. I came across this link and maybe the information provided will help you. Keep digging. Wish you were closer, I’d love to dig into the problem. As they say (or at least used to) don’t give up the ship!
 

CallMeColt

Active member
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Location
Wilson County, Texas
Thank you for the article but that is way past what I have already done. The injection pump & injector are working as they should.

To rule it out, I have tried 3 other injection pumps & had the same results.
 

jeffhuey1n

SMSgt, USAF (Ret.)
Steel Soldiers Supporter
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CallMeColt

Active member
336
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28
Location
Wilson County, Texas
You probably have this one as well. One problem I ran across, can’t remember what engine, where is was a crack in the metal inside the piston wall. You may have already covered this but run a compression check, if that’s even possible, and see if you are losing enough compression to fubar the start. If it isn’t that, I’m stumped.
I have no way to do a compression check because the needed adapter is next to impossible to find. But, the engine start & runs, just doesn't get up to speed.

Everything I have read on these small Yanmar engines, if you can't pull past the compression stroke that there's enough compression.

:(
 

jeffhuey1n

SMSgt, USAF (Ret.)
Steel Soldiers Supporter
1,378
139
63
Location
Laramie County, Wyoming
I have no way to do a compression check because the needed adapter is next to impossible to find. But, the engine start & runs, just doesn't get up to speed.

Everything I have read on these small Yanmar engines, if you can't pull past the compression stroke that there's enough compression.

:(
Do you have a part number or description of the adapter?
 
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