You may have to register before you can post. Vaseline will create the seal needed for vacuum to draw in oil.
Choosing The Right Oil Pump Engine Builder Magazine
How to prime oil pump after rebuild. The first method is to pack the oil pump full of vaseline. Stone simple and free way to prime the oil pump and make sure you have oil pressure on a new engine. This is the stuff used in the medical field but works great for this purpose too. Take the hex plug out of the oil pump put oil in the oil pump. It will prime if you do that. Click the register link above to proceed.
Works on any engine. Priming oil pump after rebuild. Melling tech director george describes the proper method of priming engines and oil pumps. Replacement harley oil pumps must be primed after installation but before their first use in order to prevent air lock or cavitation. If you use any other kind of grease the oil will not be able to displace it so make sure you only use petroleum jelly. To start viewing messages select the forum that you want to visit from the selection below.
If this is your first visit be sure to check out the faq by clicking the link above. He shows how to use the melling priming tools for in the pan pumps and our new mpl 101 pre lube oiler. You are doing damage to the bearings even trying to get oil pressure if the oil pump is just sucking air. The vaseline will then be quickly dissolved into the oil. Right now its just sucking air. The second method is to use engine assembly lube and lube all the moving parts.
Essentially air trapped inside the pump while it was out of the crankcase prevents oil from flowing and the engine quickly goes dry. You should try to pack the gears and pump cavity with petroleum jelly which will prime the pump and the oil will then displace the jelly.
Gallery of How To Prime Oil Pump After Rebuild
