74 Johnson w/o service manual. Previously ran well, but not used for 2 years. Starts, but no water through pee hole even after 30 seconds. I have inspected entire shaft and no blockage found. Impeller looks good- no cracks, flexible, and no apparent deformity. Am in process of ordering new impeller since I know this one is old, but need to know how to identify thermostat and how to inspect entry to block and block exit. Starting in barrel and noted dead bees in water. Immediate thought mud daubers may be involved, but not sure they would enter block. Need help, want to use within 1 week. Currently have head off shaft.
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No water through pee hole 74 4hp
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There is no water tell tale outlet (pee hole) in the 1974 4hp Johnson, nor is there a thermostat.
When the water pump is working properly, a water spray exits the small holes in the rear portion of the long exhaust housing between the powerhead and the lower unit.
Sitting for two years... that impeller surely has taken a set curvature... install a new water pump assembly.
To clean the block, remove the cylinder head and the exhaust baffle plate cover in order to clean out the water passages.Last edited by Joe Reeves; 08-31-2016, 08:59 PM.
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Originally posted by Joe Reeves View PostThere is no water tell tale outlet (pee hole) in the 1974 4hp Johnson, nor is there a thermostat.
When the water pump is working properly, a water spray exits the small holes in the rear portion of the log exhaust housing between the powerhead and the lower unit.
Sitting for two years... that impeller surely has taken a set curvature... install a new water pump assembly.
To clean the block, remove the cylinder head and the exhaust baffle plate cover in order to clean out the water passages.
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