Zenith carb

Nimrod77

New User
Question. I am loosing vacuum on my tractor. I have a gauge in the carb and when pulling it. It starts to fall in its face with no vacuum. It starts out at 20psi when light load in engine. It's a 300 cube Oliver.
Thx[/quote]
 
Several things can cause a loss of vacuum:
Valve lash to tight,
Burned intake valves,
Cracked intake manifold,
Broken gasket on intake manifold,
Venturi missing in carburetor,
Way big oversize Venturi in carburetor,
Worn Pistons, piston rings
By the way, a manifold vacuum gauge reads in inches of mercury, (in/hug)
Not pounds per square inch pressure.(psi).
 

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