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Garden Tractors Discussion Forum

scag zero turn cat1.1

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bill finn

09-03-2017 07:00:01

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I have a cat 1.1 liter with low power. i have replaced the fuel filter and shut off solenoid. air cleaner is new and i have no smoke. the engine has 400 hours so i have not checked valve lash yet. i have not checked rpms yet but seems to be turning pretty fast. i have been trying to find information on injection pump adjustments and not found anything yet. anybody have any ideas?

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09-03-2017 11:15:10

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 Re: scag zero turn cat1.1 in reply to bill finn, 09-03-2017 07:00:01  
Next door neighbor has a Ferris zero turn with small Cat diesel engine in it. Had problems with it for a year, finally put an electric fuel pump on it, no more problems. (was in the shop at least two times, they did not find the problem)

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09-03-2017 08:12:48

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 Re: scag zero turn cat1.1 in reply to bill finn, 09-03-2017 07:00:01  
Those engines are designed to run at 3600 RPM. Anything below that and they start losing horsepower rapidly. First thing I would check is the RPM.
Next make sure the lift pump is supplying enough fuel to the injector pump. You could have a collapsed fuel line.
Valve lash is 0.20mm or 0.008inch for both inlet and exhaust.
I would also check the injectors, and the compression before I started in on the pump.
Make sure you have the proper weight oil in it for the temperature.

Side note: I just replaced one of those engines because it had spun two rod bearings. If you need any parts, let me know, I have extras. I have everything to put back it together except the rods. Crank has been magna fluxed and turned.

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