mherrcat
Contributing Partner
The water pump on my M-18 engine has a metal backing plate behind the impeller and a paper gasket between the backing plate and the pump body. Does that gasket need some sort of sealant applied to it? If so, what type? (Same question regarding the thermostat gasket.)
The reason I ask is I removed the pump cover to check the impeller and replace the hose barbs. I did not use a sealant on the gasket and now I am noticing some green corrosion on the outlet side of the pump body. The inlet side has none. I did put a new O-ring in the pump body and used a pipe sealing compound on the hose barb threads.
There does not appear to be water leaking/dripping, but it looks like the gasket may be wicking moisture to the outer part of the body. I have some extra gaskets so I can replace it easily.
The reason I ask is I removed the pump cover to check the impeller and replace the hose barbs. I did not use a sealant on the gasket and now I am noticing some green corrosion on the outlet side of the pump body. The inlet side has none. I did put a new O-ring in the pump body and used a pipe sealing compound on the hose barb threads.
There does not appear to be water leaking/dripping, but it looks like the gasket may be wicking moisture to the outer part of the body. I have some extra gaskets so I can replace it easily.