Hi,
Been looking through the posts on this site and found some great info, but have a few specific questions I hope someone can help with.
I recently acquired an old 7.5hp mercury that I'd like to get some use out of for the summer. I think it's from around 1979. I decided to check it out initially by running it briefly in a barrel of water. With fresh fuel/oil mix it started after a couple of pulls and ran smoothly, even idling off choke after a minute, but it was only spitting water from the tell tale so I didn't let it run too long. It's been lying up a while and probably wasn't flushed of salt water. I picked up a factory manual which gives a lot of useful info but doesn't show everything, can anyone help with these few points?
1. Where would I find the serial number so I can identify if it's an early or late model 75?
2. Should there be a thermostat in the thermostat housing? There's none in it.
3. What should the internal diameter of the impeller be? I know there are two sizes.
4. Why has it got a separate stator and rectifier but no starter or ring gear? It has a black/red DC output socket beside the choke button.
5. Can I make my own exhaust cover gaskets from heavy gasket paper or are they made from a special material? I've removed the exhaust cover to unclog the water jacket.
Any help would be appreciated. Thanks.
Been looking through the posts on this site and found some great info, but have a few specific questions I hope someone can help with.
I recently acquired an old 7.5hp mercury that I'd like to get some use out of for the summer. I think it's from around 1979. I decided to check it out initially by running it briefly in a barrel of water. With fresh fuel/oil mix it started after a couple of pulls and ran smoothly, even idling off choke after a minute, but it was only spitting water from the tell tale so I didn't let it run too long. It's been lying up a while and probably wasn't flushed of salt water. I picked up a factory manual which gives a lot of useful info but doesn't show everything, can anyone help with these few points?
1. Where would I find the serial number so I can identify if it's an early or late model 75?
2. Should there be a thermostat in the thermostat housing? There's none in it.
3. What should the internal diameter of the impeller be? I know there are two sizes.
4. Why has it got a separate stator and rectifier but no starter or ring gear? It has a black/red DC output socket beside the choke button.
5. Can I make my own exhaust cover gaskets from heavy gasket paper or are they made from a special material? I've removed the exhaust cover to unclog the water jacket.
Any help would be appreciated. Thanks.
