Hi everyone, firstly what a great site, I have been doing a fair bit of browsing over the past few days and there is a great amount of info available, thanks!
I have recently acquired what I think is a Johnson 1967 model 9.5 hp 2 stroke (model MQ 13 H). It is in excellent condition for it's age and I am keen to give it a good once over, then use it on my 11ft aluminium dinghy. I don't believe it has been used in a long time, however there is excellent spark from both plugs, and the compression feels good (although I haven't measured it). Additionally there is almost no visible corrosion anywhere, and all rubber seals/tubes/leads etc appear to be in great condition.
I have purchased the original factory service manual (for a 1970 model but I understand it has only minimal if any changes from 1967).
Whilst I am new to this outboard, I am not new to outboards in general having owned several over the years (currently have a 30hp Yamaha 2 stroke and an 8hp Yamaha 2 stroke fitted to other boats), and as part of this have done my share of maintenance including water pump replacements, drilling and re-tapping snapped waterjacket bolts due to corrosion (not from my lack of up keep to be clear!) etc.
The problems I have noticed with this 9.5hp that require attention are:
When the engine is laid down (either prop down or up), there is a slow leak of gear case oil from the lower unit. Upon draining the gearcase oil I note there is a fair bit of water in there, in addition to the oil. The oil looked good however water in there is obviously not good. I also noted that there were no washers on the fill or vent screws. Gearbox changes smoothly it seems between forward/neutral/reverse. Lastly, there was an amount of fishing line wound around the propshaft that I have now removed.
Upon removal of the lower unit and removal of the waterpump housing, I note a significant amount of what I assume to be gearcase oil in the waterpump itself.
My initial plan was to replace the water pump impellor (the reason I removed the lower unit), however now I see there is additional work to be done.
My summation of the problem thus far is that I need to replace one or more seals in the lower unit, in addition to the water pump impellor. I have the following questions I was hoping someone could point in the right direction on:
1. I can easily pull out the drive shaft by hand - is this normal?
2. Do I need to split the lower unit casing and remove all of the innards to replace the driveshaft oil seal if that is what the problem is?
3. If the driveshaft oil seal is the issue, how can I get the bottom of the waterpump housing off to access the seal? It seems to be on there tight.
4. I note the seal kit located here: http://www.iboats.com/Boat-Parts-Acc...0557--gd_row.6 is for models 1958-1967 - given mine is a 1967, is this the correct seal kit?
5. Lastly, I would like to change the thermostat to be on the safe side, whilst I have removed the 3 cover bolts easily enough, dislodging the thermostat cover is proving to be a challenge - does anyone have any tips on how to do this easily?
Thanks greatly to all in advance for any help you can give and my apologies for such a long first post.