jakemaxwell806
New member
I use one of theses motors in garden tractor pulling I had a similar problem it was a fuel restricted line that slowly got worse
Forum for air cooled diesel engines and clones
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OldRedTractors
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Not sure what you mean by "a lot of adjusting from the regulator." There is a small plate on the lower side of the pump.
OldRedTractors
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I thought of that, so I pulled the fuel line, which had a kink in it just past the fuel tap. It didn't seem severe enough to restrict any fuel flow, but I re-routed it and also replaced the fuel filter and checked the fuel tap - all clear.
OldRedTractors
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Just realized that when I put the pump back in, I missed engaging the governor lever / fuel cut-off correctly. Removed and re-installed it, and took another video. In this one, you can hear how is smooths out when you hold back the governor lever a bit, and you can see the flames in the exhaust. Gen run 2 - YouTube
jakemaxwell806
New member
Congratulations
OldRedTractors
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- Kubota L-48, Farmall Cub ('64), Hinomoto JF-1
Congratulations
Well, no - it still runs like crap - exactly how it did before I took it apart, no changes, just briefly messed-up on the re-assembly, but it didn't matter...
Agvg
Elite Member
If you take that plate off you can see what's going on when the engine is running.
OldRedTractors
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Ah, OK - I think if you look at the last video I posted, you can see the "throttle / governor" bouncing, and hear the engine smooth out a bit if I hold it ~1/2 throttle. This would be the same motion I believe, right?
OldRedTractors
I read your previous posts and you mentioned you hadn't pulled the filter yet, that should be next step to determine if anything is going on inside.
My first silent generator looked exactly like yours but with a different name.
I was letting a friend use it during a huge ice storm several years ago when it failed at 40 hours or so. It kept shutting down due to low oil pressure and was skipping & popping like yours.
The problem was a failed cam bearing which plugged the filter causing the shut down.
I also repaired a Yanmar L70 mil surplus that had the same symptoms and that issue was corrosion on the injector lobe that caused the hardened cam surface to flake off which changed the injection event at full speed. The cause of this was wet stacking then prolonged sitting allowing moisture to corrode the cam.
Your symptoms are similar but you say the injector lobe is perfect. Did you rotate the engine to look at the entire cam?
If the cam is good and the filter is good I would look at the injection pump, possibly a restriction in the inlet of the pump.
The pump can be disassembled quite easily for inspection.
Prepare a clean area and remove the spring retainer and carefully remove plunger.
The fit is extremely precise so care in removing and reinstalling it must be exercised as it can get stuck, do not force!! Use Finesse!
There should be no surface defects.
Care in handling is essential as moisture on your hands can cause corrosion so handle carefully and use diesel to clean & lube during reassembly.
One other thing to look at are the valves, check valve clearance if ok turn engine over to TDC so valve won't fall into engine and and remove the valve springs to so you can check for a worn guide, very unlikely!
That's all I can think of for now.
90cummins
I read your previous posts and you mentioned you hadn't pulled the filter yet, that should be next step to determine if anything is going on inside.
My first silent generator looked exactly like yours but with a different name.
I was letting a friend use it during a huge ice storm several years ago when it failed at 40 hours or so. It kept shutting down due to low oil pressure and was skipping & popping like yours.
The problem was a failed cam bearing which plugged the filter causing the shut down.
I also repaired a Yanmar L70 mil surplus that had the same symptoms and that issue was corrosion on the injector lobe that caused the hardened cam surface to flake off which changed the injection event at full speed. The cause of this was wet stacking then prolonged sitting allowing moisture to corrode the cam.
Your symptoms are similar but you say the injector lobe is perfect. Did you rotate the engine to look at the entire cam?
If the cam is good and the filter is good I would look at the injection pump, possibly a restriction in the inlet of the pump.
The pump can be disassembled quite easily for inspection.
Prepare a clean area and remove the spring retainer and carefully remove plunger.
The fit is extremely precise so care in removing and reinstalling it must be exercised as it can get stuck, do not force!! Use Finesse!
There should be no surface defects.
Care in handling is essential as moisture on your hands can cause corrosion so handle carefully and use diesel to clean & lube during reassembly.
One other thing to look at are the valves, check valve clearance if ok turn engine over to TDC so valve won't fall into engine and and remove the valve springs to so you can check for a worn guide, very unlikely!
That's all I can think of for now.
90cummins
