56 mark6 tell tale blowing air/exhaust ?

[jbron]

Got this near mint Merc that was rebuilt<br />throughout including impeller etc. Don't want<br /> to take apart if I don't need to(paint is over<br />nuts and gaskets). <br /> Is there supposed to be water coming from<br />4 holes on top of driveshaft housing. There is<br />air pulsing out of holes but no water. Turned<br />off before overheating . Checked for plugged <br />intake holes , no problem . p.s had been run for a year after rebuild. thanks !

 

[Laddies]

Re: 56 mark6 tell tale blowing air/exhaust ?

If it's not punping water then you have no choise other than to repair the pump

 

[jbron]

Re: 56 mark6 tell tale blowing air/exhaust ?

My hope was to find someone with first hand knowledge of this particular motor because the<br />manual doesn't show actual spot water comes from.<br /> Some older motors have weird position.<br /> The four holes also had what seemed like carbon<br />coating . I was hoping against hope I guess.<br /> Never had one blow so much air and not water!

 

[Laddies]

Re: 56 mark6 tell tale blowing air/exhaust ?

I have worked on them since the early 60s and you should be getting a mix of water and exhaust from the holes that you are talking about not a stream of water. Ck the water jacket and if it is not hot then you don't have a problem

 

[jbron]

Re: 56 mark6 tell tale blowing air/exhaust ?

Ran motor for less than 10 seconds and housing<br />was warm already . I should have known better,<br /> thanks Laddie , I hope I didn't make it sound<br />like I doubted you !!!! Now the search begins<br />for parts and manuals.

 

[Laddies]

Re: 56 mark6 tell tale blowing air/exhaust ?

Mercury Manual 90-25500

 

[Chinewalker]

Re: 56 mark6 tell tale blowing air/exhaust ?

It may take more than 10 seconds for the water to start cycling through the whole motor. Also, the waterpump is located relatively high up in the mid-section and won't draw unless the water level in the tank is relatively high up, too. <br /><br />It is a tiny pump and not very robust, so it wouldn't take much abuse to make it not pump. If the motor was ever run dry for even a few seconds it might have been enough to kill it. It's also possible that whomever rebuilt it used a New-Really-Old-Stock pump impeller that was already well aged prior to installation. NOS on impellers isn't always a good thing as they can age on the shelf as well as in a motor...<br /><br />- Scott

 

[cwest]

Re: 56 mark6 tell tale blowing air/exhaust ?

Originally posted by bronzeback1:<br /> Now the search begins<br />for parts and manuals.

You can find both the manual and the part here:<br /><br /> http://www.oldmercs.com/mk6.html <br /><br /> http://www.oldmercs.com/