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Case Tractors Discussion Forum
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300 vs VAC oil pressure on a g148

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Garkoe

11-21-2005 04:36:50




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the oil filter housing on my 300 roundnose was up to 7 psi after removing oil pump inspecting and cleaning it troughly. I did find that on the vac there is an orriface in the inlet side of the housing passage as well as the ball check valve.the 2 300 housings I have have no resriction as well as a tube up trough the middle of filter. so I changed it out and put on the Vac housing and now I am at 12psi. So my question is there a service bulletin on the g-148 on giving up engine gauge pressure to gain oil volume. what gives since no restriction is on the 300??

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garkoe

11-21-2005 13:54:00




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 Re: 300 vs VAC oil pressure on a g148 in reply to Garkoe, 11-21-2005 04:36:50  
the oil pumps are identical. the same number and configuration. I had both on a bench. and both are g-148 engines.



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Joe (Wa)

11-21-2005 19:33:58




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 Re: 300 vs VAC oil pressure on a g148 in reply to garkoe, 11-21-2005 13:54:00  
You are correct, VA series & 300 series use the same oil pump. There are at least 3 different oil filter housings used on the VA & 300 series.

I have a '53 VA, '56 310 & '59 311B. None of them has a relief valve or a restrictor at the oil filter inlet. The VAC & 311B have 3 holes in the top of the stem tube to direct oil to the top of the filter media. The 310 has 1 hole at the very top. All 3 tractors run 14-15 psi (on a calibrated gauge) at operating temp.

The valve is used to by-pass a plugged filter (whatever sense that makes on a shunt filter system?). The free length of the valve spring is 1-5/8" and sustain a 12 oz load when compressed to 1-3/32".

The valve may be leaking through. You could check that by blinding the oil holes with a piece of tin between the gasket and the filter hsg as bolted to the block. I wouldn't expect to see an oil press change more than 1 psi if any at all.

Joe

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Triplerange

11-21-2005 13:46:55




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 Re: 300 vs VAC oil pressure on a g148 in reply to Garkoe, 11-21-2005 04:36:50  
Well, in college, they taught that pressure is figured by adding up the restrictions downstream of the pump. flow and pressure are inversly related. If we are using the same pump and removing restrictions, then the flow will increase. If we increase the restrictions then the flow will decrease. As far as I know, flow is more important than pressure to an engine. Please note that increasing pump performance means you will gain both pressure and flow. I Do not know if the oil pump is the same for the VAC and 300. I have my doubts.

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