Oil Slingers

[JohnRude]

It seems that Johnson and Evinrude 50’s motors from 3hp to 7.5 hp used an oil slinger as an upper crankshaft seal. My 7.5 is leaking (apparently). When I tapped it to make sure it was sitting level the whole thing dropped about 1/32 of an inch. Has anyone ever fixed or replaced one of these. The rest of the motor is in great shape. It would be a shame to dump it for parts. Don’t know how to upload a picture from the service book.

 

[RICHARD A. WHITE]

Can’t explain why they did it, but I would guess that as long as the upper part of the slinger is below the boss where the oil is slung to…should be good…but I have been wrong before…

 

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[Mumbles]

The slinger is a press fit on the crank and it intercepts any fuel mix getting by the top crank bushing. It fits in a groove in the block and this groove has a small hole in it for the excess mix to get sucked back into the intake manifold area and burned in the normal way. If this hole is plugged, the mix might build up and appear to be leaking. Oil on top of the mag plate would indicate this. If the slingers fit is loose on the crank, it can be removed and deformed slightly to hold it in place or a bit of super glue could be used to. Of course the motor will have to be disassembled to do this though.

[crosbyman]

see pict from red book

Joining AOMCI has priviledges 🙂

[JohnRude]

Thanks Mr. Crosbyman. I understand, more or less, how this works from your response last week. Much appreciated. Mumbles, above has told me the bad news. I have to take the block apart and either replace the slinger (if I could find one) or push it back up into position exactly 1/16 of an inch above the upper journal. This gap is required for the oil to pool and get sucked back down. If all things are “perfect” and the suction is good none of the oil would escape past the slinger up onto the mag plate. Unfortunately, I didn’t heed your advice last week to leave it alone, run it, and check from time to time. I tapped it and it slipped down.

I wonder. If I know the exact diameter of the crankshaft and the exact depth to the upper journal allowing for the 1/16th perhaps there is a regular seal that might work there. Is this too far outside the box?

[JohnRude]

Great tip. I was hoping for a solution earlier and sort of thought of liquid epoxy or something to improve the “fit”. But I pushed the slinger down. I will sleep fitfully tonight knowing that I have to take the whole thing apart to get at the slinger. See my post to Crosbyman.

Again thanks all for this support. One solution is worth the membership.

 

[crosbyman]

Greenlighting…..

 

maybe a  top oil hole  (or 2 ???) is plugged (oil should be sucked back inside the crankcase from what I understand)

 

try soaking the top with some carb cleaner to lossen any  oily crud….under the slinger  try  applying air pressure on the top end  to build up pressure  around the crank and dislodge   any sludge or crud .

Or…. try applying suction  to suck out any crud from the drain holes but  soak it up before applying suction

soak a few days…. repeat   who knows maybe it will clear up . easier than  cracking open the power head

Joining AOMCI has priviledges 🙂

• This reply was modified 3 years, 5 months ago by crosbyman.

[johnny]

The oil slinger doesn’t appear to be a wearing part to me. There is a used one for sale on ebay right now.

[JohnRude]

Good plan. The offending “slinger” is down on top of the upper journal and there is no way to pull it up. I can see those holes that you speak of and if I can see them they will be sucking air. I could hook everything up, carb, magneto, etc., but….I doubt it. When and if I find the courage to yank this apart I’ll make sure those return oil channels are clear. I wonder how easy it will be to address the slinger on the shaft without disconnecting the pistons.

Learnin’ the hard way.

[crosbyman]

John rude… printing/posting  Red book pages…simple 🙂

 

 

1. Access the Red  book previously  stored n your computer in a   PDF file   and  go to the  desired page or sequential   pages  you will want to post
2. the  book ‘s “image” page number  is not used …as you scroll book pages the top left page window   page ID   is the  real one to use ex:   400   while  book page   image displayed is actually 375
3. Select the PRINT icon or  CTL-P
4. The computer left side print window  will show print options … select PDF as your printer 
5. Fill in the printer’s  PAGE  or PAGE range  to   indicate the page or ..a few pages desired from the   top left page    reference in the RED book display   ex: fill in 400-402 to “print” pages 375-376 of the RED book
6. Select PRINT
7. then enter & remember the name given your  pictures (pages)  for your   CPUstorage file   ex:   IMAGES  or   DOCUMENTS….  and the book images will get copied into your… selected  CPU file  in PDF format
8. In your AOMCI posts   use ATTACH FILE ..bring up your  storage file (images-documents)   at the bottom write the name given your pictures  and  they will be transferred into your posts as attachements
9. ……………………………
10. another method is to   use  the Windows snip-it tool (scissors)    name the captured image  and    to store it  in a  file  and follow step #8 to post the  “snip-it” on AOMCI

don’t select to many pages or  you will exceed  the total file page size limit around  2mb

Joining AOMCI has priviledges 🙂

• This reply was modified 3 years, 5 months ago by crosbyman.
• This reply was modified 3 years, 5 months ago by crosbyman.

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