1977 70 Hp water pump kit? Help!

[dwbrayton]

I ordered a water pump Kit for my 1977 Evinrude<br />70hp from NAPA, PN 183389.<br />I see that the impeller has a different type of<br />keyway, then I noticed that the box is marked for <br />1979-88 70hp. Now what do I do? Can this<br />impeller be used on my 1977 motor?<br /><br />Oh! btw there are 6 bolts holding the Lower <br />unit on. One is hidden under the trim tab. <br />Just make sure you mark its position before you <br />take it off.<br />Thanks for any help.

 

[michligj]

Re: 1977 70 Hp water pump kit? Help!

DWB,<br /><br />I'm pretty sure you need to take it back. The kit you need should span 1974-1978.<br /><br />there is a different kit for 79-95.<br /><br />I believe you need part #18-3388.<br /><br />Hope this helps

 

[dwbrayton]

Re: 1977 70 Hp water pump kit? Help!

Thanks. I was afraid of that. The NAPA Marine <br />catalogue I was looking at does not list a kit <br />for motors older than 1979. It does show the <br />Impeller though with a different Pn. Maybe I should order that. The housing & wearplates <br />look OK.<br /><br />Thanks

 

[willamettejeff]

Re: 1977 70 Hp water pump kit? Help!

Kit you need is available here on Iboats is Sierra part #18-3388 and is for a 1974-78 motor. Does not include the housing though. Napa part number I'm guessing would be 183388.<br /><br />Also, Ishopmarine has 3 different kits available for my 1978 Johnson 70hp. Two of these are with housing. They don't show one available for the 1977 motor, but since Sierra kit covers 1974-78 I'm wondering if the kits listed for the 1978 motor can actually be used on the 1977 motor. Don't think there is any difference between the lower units of either.

 

[dwbrayton]

Re: 1977 70 Hp water pump kit? Help!

NAPA no longer lists the 18-3388 as a valid PN., so I picked up an impeller at my local boat shop.<br /><br />I have replaced the impeller & reinstalled the lower unit. Hooked hose to the unit & fired her up. Seems to be getting awful hot & I can't see where any water hot is comming out. Could the muddobber wasps have plugged the outlet? Where is the outlet?<br />

 

[MCM]

Re: 1977 70 Hp water pump kit? Help!

The wasps can be a definate problem especially if the motor has sat for a long time. I think your 70 l/u is probably similar to my 75 50hp, after replacing my impeller and starting the motor it overheated rapidly, that's when I noticed the damn nest, I could see it in the set of holes just above the cavitation plate, pulled the l/u back off & cleaned it out. Not wanting to leave it half done I pulled the cover off the head, in addition to them getting in there too I had a bad thermostat. Luckily I had already bought a replacement t/stat & cover gasket since I was going to be in there figured might as well replace it.<br /><br />Hope this helps,<br />Mike

 

[papasage]

Re: 1977 70 Hp water pump kit? Help!

the impeller # on 74 through 78 is different you need 18- 3082 impeller . think you will have to buy in seperate pices as the NAPA dont show in a kit . the kit you have might work except the impeller.