Wisconsin — Oil Pressure Adjustment
Adjustments · lubrication system
From a Wisconsin service manual covering: FM-X4B7D, V-460D, V-461D, V-465D, V460D, V461D, V465, Y-128-S1, YB-85A. Check it applies to your exact model before use.
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Procedure
- Locate oil pressure relief valve beneath starting motor next to oil filter.
- Remove expansion plug from end of valve.
- Remove outer lock screw with 3/16 inch Allen wrench.
- Adjust spring tension with adjusting screw; clockwise increases pressure, counter-clockwise reduces.
- Run engine at 1800 RPM hot; adjust to 40 to 45 PSI.
- Idle at 1000 RPM; if below 15 PSI check oil pump, bearings and connections.
- Install outer lock screw firmly.
- Seal with new 3/4 inch expansion plug.
Tools required
- 3/16 inch Allen wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 40 to 45 PSI at 1800 RPM hot
- Minimum 15 PSI at 1000 RPM idle
Source: Wisconsin service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.