impeller removal 1960 merc 400

[59 classic boat]

I removed the lu without any trouble today but cannot get the inpeller cover plate off. I have soaked it in pb blaster tried a punch with a 5 lb dead blow hammer and have mde a spanner wrench to fit the holes in the plate. all to no avail. Is there a key in the little notch in the housing next to the plate? Or is t5his plate possibly left hand threaded. Although I did try giving it a go in that direction Any help would be apreciated before I use a chisel and cut it in two.

 

[Yepblaze]

Re: impeller removal 1960 merc 400

It's a right hand (normal) thread. It's just corroded in place.<br /><br />Not unusual to have to apply lots of heat to the area, along with penetrating oils to break it free. <br /><br />Or, after mutilation takes place bust/break it out in pieces.<br /><br />Be carefull to not damage the threads aroun the edge of it.<br /><br />Might be best to find a new cover before breaking it out so you can envision the area best to break away. <br /><br />I've heard of some using a dremel tool to slice away at it, but be carefull again to not damage housing or water pump cup below it.<br /><br />Should be a wear plate between it and the impeller.<br /><br />I've had sucess with heat, oil, and a big metal hammer with a good 1/4" pin punch.

 

[59 classic boat]

Re: impeller removal 1960 merc 400

Still no luck today I tried heat pb blaster 3/8 punch then pneumatic hamer with 3/8 punch. I am cutting a ring around the plat from the holes but no movement from the cover. Today I order the new cover so I can take her out.<br />Thanks for the advice.