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Pressure Release Valve

Steve Jowett www1.kingston.net/~fortierg/mainb.htm

The purpose of the pressure release valve is to relieve the pressure in the oil chambers from reaching levels which could force leakage or line eruption. The valve is factory set to release at the 50 - 55 lb. mark. The valve will divert the oil back to the return side of the pump which pushes it up to the tank.

I have never heard of any problems with this item but if you are re-doing the bottom end (especially after a seizure), take this apart and inspect all the pieces. Provide a thorough cleaning and reassemble as per the factory recommendations.

The only method I know of checking the pressure setting is with an oil pressure gauge attached.

 

J.B. Nicholson - Modern Motorcycle Mechanics

Oil Pressure Release Valve: The hexagonal post inside the timing cover contains the pressure release valve. Unscrewing the first hexagon removes the spring and plunger. The second hexagon forms the body and when overhauling, this should be unscrewed for cleaning the screen attached to it.

Pressure Release Valve

1968 Commando

Fastback after Serial Number 126125 - Frame Number 126125

Part No.

Description

Quantity

Models

 T-2059A

 Pressure release body assembly 

1

All

 T-2054

 Release body piston

1

All

 T-2061

 Release body piston spring

1

All

 15404

 Packing shim

as required

All

 T-2060

 Release body nut

1

All

 T-2058

 Release union washer

1

All

 T-2057

 Release body nut washer

1

All

 

1969 Commando
Fastback, S and R after Serial Number 131257 - Frame Number 131257
Part No. Description Quantity Models
 T-2059A  Pressure release body assembly  1 All
 T-2054  Release body piston 1 All
 T-2061  Release body piston spring 1 All
 15404  Packing shim as required All
 T-2060  Release body nut 1 All
 T-2058  Release union washer 1 All
 T-2057  Release body nut washer 1 All

 

1970 Commando
Fastback, S, R and Roadster after Serial Number 135140 - Frame Number 135140
Part No. Description Quantity Models
 T-2059A  Pressure release body assembly  1 All
 T-2054  Release body piston 1 All
 T-2061  Release body piston spring 1 All
 15404  Packing shim as required All
 T-2060  Release body nut 1 All
 T-2058  Release union washer 1 All
 T-2057  Release body nut washer 1 All

 

1971 Commando
Fastback, Roadster, Hi Rider and SS after Serial Number 141717 - Frame Number 141717
Part No. Description Quantity Models
 T-2059A  Pressure release body assembly  1 All
 T-2054  Release body piston 1 All
 T-2061  Release body piston spring 1 All
 15404  Packing shim as required All
 T-2060  Release body nut 1 All
 T-2058  Release union washer 1 All
 T-2057  Release body nut washer 1 All

 

1972 Commando
Fastback, Roadster Roadster Combat, Interstate and Hi Rider
after Serial Number 200001 - Frame Number 200001
Part No. Description Quantity Models
 T-2059A  Pressure release body assembly  1 All
 T-2054  Release body piston 1 All
 T-2061  Release body piston spring 1 All
 15404  Packing shim as required All
 T-2060  Release body nut 1 All
 T-2058  Release union washer 1 All
 T-2057  Release body nut washer 1 All

 

1973 Commando
Roadster, Hi Rider and Interstate
Part No. Description Quantity Models
 T-2059A  Pressure release body assembly  1 All
 T-2054  Release body piston 1 All
 T-2061  Release body piston spring 1 All
 15404  Packing shim as required All
 T-2060  Release body nut 1 All
 T-2058  Release union washer 1 All
 T-2057  Release body nut washer 1 All

 

1974 Commando
Roadster, Hi Rider and Interstate
Part No. Description Quantity Models
 066195  Pressure release body assembly  1 All
 T-2054  Release body piston 1 All
 T-2061  Release body piston spring 1 All
 15404  Packing shim as required All
 T-2060  Release body nut 1 All
 T-2058  Release union washer 1 All
 T-2057  Release body nut washer 1 All

 

1975 Commando
Roadster, Hi Rider and Interstate
Part No. Description Quantity Models
 066195  Pressure release body assembly  1 All
 067540  Release body piston 1 All
 067544  Release body piston spring 1 All
 067546  Packing shim as required All
 067543  Release body nut 1 All
 067542  Release union washer 1 All
 067541  Release body nut washer 1 All

 

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