generator12
Senior Chief Petty Officer
- Joined
- Jul 9, 2010
- Messages
- 666
My boat hasn't been in the water for almost 8 weeks, and the Merc 170 hadn't been run for at least four. So I lifted the cover, hooked up the hose, climbed in and started her up.
As I always do, I sat and watched the gauges, intending to let her run for five minutes or so at around 1700-1800 RPM, charge the battery, and get up to operating temperature before shutting her down. After about three minutes I noticed an odd odor, and also the fact the the temp. was rising past the 160 degree mark that she always holds on the muffs.
I climbed out and to my horror saw that the hose connection had slipped out of the muffs, the hose was on the driveway, and there was no water discharge from the outdrive. Of course I climbed back in and shut her down, as the closed system began to vent anti-freeze into the doghouse. I continued to turn the key on to check the temp. rise and saw her get up to around 220 degrees as the engine temp. equalized.
Obviously, the odor had been the pump impeller.
So, on Monday the pump comes apart and I'll do a compression check. If the compression is reasonable, and oil and anti-freeze both look okay, I'll run her again and see what I've got.
Took the muffs to my workbench and found that the stamped clamp holding the barbed fitting in the rubber bonnet was so loose that I could pull the fitting out with very little effort, and slip the clamp off easily as well.
A little rubber cement and a proper hose clamp has fixed the muffs. Now let's see what's required to fix the engine.
As I always do, I sat and watched the gauges, intending to let her run for five minutes or so at around 1700-1800 RPM, charge the battery, and get up to operating temperature before shutting her down. After about three minutes I noticed an odd odor, and also the fact the the temp. was rising past the 160 degree mark that she always holds on the muffs.
I climbed out and to my horror saw that the hose connection had slipped out of the muffs, the hose was on the driveway, and there was no water discharge from the outdrive. Of course I climbed back in and shut her down, as the closed system began to vent anti-freeze into the doghouse. I continued to turn the key on to check the temp. rise and saw her get up to around 220 degrees as the engine temp. equalized.
Obviously, the odor had been the pump impeller.
So, on Monday the pump comes apart and I'll do a compression check. If the compression is reasonable, and oil and anti-freeze both look okay, I'll run her again and see what I've got.
Took the muffs to my workbench and found that the stamped clamp holding the barbed fitting in the rubber bonnet was so loose that I could pull the fitting out with very little effort, and slip the clamp off easily as well.
A little rubber cement and a proper hose clamp has fixed the muffs. Now let's see what's required to fix the engine.
