liv2ryde100
Active Member
I called defender and they gave me the phone number for original manufacturer out of Clearwater Florida, 211$ shipped for the identical one that’s in there
Bob - At Last
Member
The shower sump pump drain hose (from sump pump out to side of boat) runs behind the cabinet in the aft cabin where the vacuum is stored. I know that because I had a similar problem with wet carpet in the aft and it was because the drain hose developed a crack from friction where it was rubbing behind the cabinet. Was a bitch to fix, had to remove cabinet, etc.
Have a 2006 340 Sundancer with twin 8.1 mercs. Just noticed a knocking sound coming from the starboard engine at idle and at high rpm. Any ideas was this might be? Engines have been running great besides that. Any feed back would be helpful. Thanks
yv1
Member
I would run the engine without the belt for a couple of minutes to see if the knocks goes away. If it's still knocking with no belt I would call a good mechanic.
KevinC
Well-Known Member
You did not mention if this was in neutral or in gear or both. Is this a mechanical knock or a fuel burn type of knock.
I would check belt tension first - easy test. If you do choose to run this engine without the belt as noted above you should know that there will be no raw water is being circulated and the engine and exhaust will quickly overheat.
If you can't easily identify the source of the knock as an external component (water pump, etc) to the block I would start with some basics. The 8.1s seem to have a history of eating plugs and wires. I would check to make sure all the wires are secured and then start with changing the plugs.
-Kevin
Korkie
Active Member
- Feb 2, 2016
- 1,331
- Boat Info
- 2006 340 Sundancer, Garmin 7610, xHD 24 Radar, VV703, SeaStar Hydraulic Steer, Shadow Drive AP
- Engines
- Mercruiser 496 Mags
Bravo III Drives
Start simple. Check your pulleys. Take a screwdriver and put the tip on each pulley (the ones with bearings that the center doesn't move are usually the culprits) and put your ear up to the handle of the screwdriver. See if you hear your knock. I have same engines, same year. Have had to replace 3 over last 2 years and have another that has just developed. A god percentage of the time, if it is a pulley, it will go away after things heat up a bit - but if you find a bad one, change it out.
liv2ryde100
Active Member
yea i second the screwdriver to the ear tip,
liv2ryde100
Active Member
this past weekend while at idle i had an alarm go off for a second, looks like it is a low water pressure alarm, I'm reading zero water pressure at idle on the starboard side. when i bring the boat up the pressure starts to climb, i have water coming out the exhaust the whole time and temp is holding perfectly. impellers are new and strainers clean so i think its the actual sensor. anybody know where this sensor is?
KevinC
Well-Known Member
Also check your belt tension - beginning of the season I had a low water pressure issue (low not zero) at idle would increase pressure with RPM but not enough. Belt was way too loose. Tightened and got better but still not right (port v starboard) and temps would rise. Swapped out for new belts - then perfect pressure on both sides.
-Kevin
liv2ryde100
Active Member
Ok I’ll take a look but temp still holds so I was assuming it’s gotts be a sensor
liv2ryde100
Active Member
kev, do u know where that sensor is so i can change it out?
KevinC
Well-Known Member
It should be right in the water pump assembly.
-Kevin
-Kevin
liv2ryde100
Active Member
i was afraid of that, what a pain in the ass to get to. thanks
KevinC
Well-Known Member
Sometime ago I bookmarked this discussion on IBOATS regarding the replacement sensor if you want to go non-mercury.
-Kevin
-Kevin
KevinC
Well-Known Member
Starboard engine should at least give you better access to the water pump (compared to the port) since it's better exposed between the engines.
-Kevin
liv2ryde100
Active Member
Lol of course it’s the port side. I’ll stay oem butvthanks for the link
KevinC
Well-Known Member
Looks like its around $150 for the merc and $30 for the OEM auto part on Ebay.
-Kevin
-Kevin
KevinC
Well-Known Member
Oh, Ok, I thought you said it was the starboard engine. Do a search on ebay for the part. They do look like the merc's are just repackaged.
-Kevin
-Kevin
liv2ryde100
Active Member
I'm trying to decide if i think the sensor is bad, or i just had a bunch of eel grass up against the south bay strainer. i went from massapequa to watch hill and back, it happened both times in massapequa cove, so maybe i just loaded up with eel grass.
KevinC
Well-Known Member
Do you have South Bay Strainers? It's possible you had some restricted flow but 0 with temps holding? How long did it take for the pressure to return?
-Kevin
-Kevin