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Stationary Engines Discussion Forum

motor dies under load

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balfe

09-18-2005 15:56:28




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I have a vf4 wisconsin on a log splitter. It sat for 8yrs. Got it running good.Motor dies under load.Has gearbox to chain to (webster electric)hydraulic pump.could exhaust valves be sticking open,if so how can I check & repair? Or could it be hydraulics problm? No filter in hyd. system. Ram does jerk a little when running out. Could cylinder be binding? I would think this should split with no problem. Any info greatly appreciated. Thanks Scott

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JT

09-20-2005 07:35:58




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 Re: motor dies under load in reply to balfe , 09-18-2005 15:56:28  
More than likley it is a carb problem, have the points been cleaned, gapped? Does it have new plugs?, If these two have been done, then more than likley you need a carb rebuild or at least cleaned and adjusted. You might be able to dump a can of Sea Foam in the fuel, let it run and this might clean the carb enough to adjust the problem out of it.



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balfe

09-20-2005 10:19:18




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 Re: motor dies under load in reply to JT, 09-20-2005 07:35:58  
Mag rebuilt/new plugs, wires,points.Carb has been acid washed. float seems ok. Could it be fuel pump? fuel line, glass bowl all cleaned.Think it,s starving for fuel? I,m gonna put a 3ooolb gauge on pump see what press. its putting out when motor starts to die. thanks Scott



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JT

09-23-2005 17:47:34




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 Re: motor dies under load in reply to balfe, 09-20-2005 10:19:18  
find yourself a little gas tank and hang it above the engine and gravity feed the carb and see what happens then, this is one way to eliminate the fuel pump. It should only have 3-5# of pressure.



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balfe

09-29-2005 16:22:49




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 Re: motor dies under load in reply to JT, 09-23-2005 17:47:34  
To JT, I tried the tank thing,directly into carb. still dies. Doesn,t smoke,doesn,t burn oil. A dealer told me the engine may be worn out ? How do I check that? Compression test? He also said pump and motor may be mismatched? Motor not big enough?The pump is made by Webster Electric.Ever hear of it? When ram is fully in or out it gives that hydraulic straining sound,and engine loses rpm.Won,t split good size log.I can,t ask the man who built it,he is no longer with us.Thanks for your help, Scott

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JOB

09-29-2005 18:38:18




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 Re: motor dies under load in reply to balfe, 09-29-2005 16:22:49  
Do you have the throttle pulled back? If so you need a pressure relief valve in the line so when the line pressure gets to say 2000 psi the fluid is diverted to the tank. I personably built a splitter powered with a VE4. It was built 26 years ago. The engine spins a 15-gallon per minute pump and puts out 2000 psi. I use a 4-inch cylinder and it splits anything I put through it. Sometimes I might have to shave off the edges when I have a big knot or the piece is all knar led up. In your case you have 25 horse which should spin a 25-gallon per minute pump at 1500 psi. That actually takes 26.2 HP. 20 gallon per minute at 2000 psi takes 28.0 HP. You might have too big a pump for the amount of HP you have.

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balfe

10-09-2005 14:24:10




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 Re: motor dies under load in reply to JOB, 09-29-2005 18:38:18  
To JOB, Took compress. test. 25# each cyl. seems low to me? Took all plugs out,put in tester cranked 5-6 times each cyl. is this the right way to do the test? Also put 3000# gauge on hyd cyl hose - press only get up to 1150# before motor starts to slow down.Throttle is pulled back. Any suggestions thanks Scott



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JT

10-12-2005 17:09:49




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 Re: motor dies under load in reply to balfe, 10-09-2005 14:24:10  
How long has this engine been sitting? 25# compression and still starts and runs does not add up to me, If you are hand cranking this engine, you may not have much more compression than that. As the other feller told you, squirt a little oil in each cylinder and see if that increases compression, if it does you might need a ring job, if that does not help, you could have bad valves, need ground and reseated. Does this thing start easy, or is it hard to start?? It almost sounds like you may have more pump than the engine can handle, is there any kind of tag on the pump showing pressures or anything? But this is 25HP engine and should handle a pretty good size pump unless the pullies are geared all wrong.
Jim

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JOB

10-09-2005 16:12:27




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 Re: motor dies under load in reply to balfe, 10-09-2005 14:24:10  
25 LBS. is low. I would think the compression should be around 75 LBS to 95 LBS. The rings could be stuck to the pistons. Try pouring a fluid ounce of crankcase oil into the cylinders through the spark plughole. Then turn the engine over. If that does not free up the rings or improve compression you might need to re-ring it. Or you could take the pistons out of the engine and see if the rings are stuck to the pistons and free them up that way. There are other reasons why you could have low compression; the most likely one from the engine sitting is stuck rings. Good luck

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