1976 MERCURY 850 85 HP OUTBOARD

[seaswirl88]

I have a 1976 mercury 850 85HP outboard. I drained the lower end to get ready for the summer and the oil was milky. What seal(s) could be the culprit

 

[racerone]

Install a complete seal kit in the lower unit.

 

[seaswirl88]

I just disassembled the water pump AGAIN because it had water in the lower end. I noticed that the spacer P/N 23-70412 is not installed nor are there any shims P/N 15-57007A1. Not sure why they are not installed or are even necessary. Any ideas why they are/are not installed? I imagine the shim is to manage shaft play.

 

[jduda22]

@seaswirl88 do you have the serial number for the engine? sounds like you need to replace the oil seals or like racerone suggested do a complete reseal of the complete lower unit. I can get you parts numbers for the items and schematics if you can get me the serial number.

 

[fitz73222]

Have you pressure and vacuum tested this lower unit to see where the leak is coming from? You were asking the same questions on another site.