DGK

Member
What kind of pump pressure shood I have while poney is turning big motor over? The needle barley moves until big motor starts then it goes half way over. Thanks for any help. Doug
 
I believe 15 psi is ideal but they will start with around 5 psi--mine is very low also. Need to check the transfer pump bypass spring and plunger as they tend to crud up and not close.
 
Put new spring and valve in. with big motor idlen have 1/4 needle on gauge, wide open 1/2 gauge. where abouts would be 15lbs?
 
I haven't paid any attention to the numbers, but mine lays way over to the right. When the fuel pressure comes up it almost pegs it over on the right.

Gene
 
Mine runs great once you get it runing, but you have to either it every cold start. No blowby and doesn't use any oil. Thanks Doug
 
how long are you turning the diesel over under compression to warm up the chambers and intake manifold?
 
Probably 2 min. in 60 degree weather. ALSO do u open throtke then or probbly better to wait until cyls are warmed up mpre. Thanks Doug
 
at 60 degrees I turn mine over about that same time, and i do give it a quick shot of either to fire it off.Colder temps you need to run the pony longer or supply external heat to the intake manifold.
every fuel pressure gage reads differently, the calibration goes off, and many machines have all different model gages, the one I have now i got off ebay and its a SW gage.
 
Every Cat seems to start differently. I know all mine do. I have one 7U that was all rebuilt in good shape. I have to turn it over until I can feel the head warm up before it will even cough and then it labors to start. I just wait until the oil pressure comes up and give it sniff of starting fluid. I have another one that has a weak cylinder and burns a gallon of oil per hour. As soon as the oil pressure comes up I shove in the compression release it is off and running.

I had an old 5U back when parts were affordable from Cat. I replaced every wearing part in the transfer pump and never got it to start without a sniff.
 

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