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| Water circulation problems... https://www.smwebhead.com/phpBB3/viewtopic.php?f=3&t=12175 |
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| Author: | Road Racer [ Sat Aug 17, 2013 1:57 pm ] |
| Post subject: | Water circulation problems... |
I have a 1990 200 Horizon v8 with a cobra outdrive. I have the water attached and on. I start the engine and the water never seems to be circulating. The water should come out after it circulates and nothing comes out. Does the impeller need replacing? The temp goes up to120 Degrees. |
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| Author: | rpengr [ Sat Aug 17, 2013 2:16 pm ] |
| Post subject: | Re: Water circulation problems... |
Sounds like a definite YES. Water should come out within seconds of the engine starting. Does not matter if it is warmed up or not. Water would come out with the exhaust (through prop hub, and/or through bottom of exhaust bellows because the bellows usually have drain slots. 120deg temperature reading is probably incorrect if there is only AIR around the temp sensor. Fortunately it is very easy to change the impeller on the Cobra outdrive. Just remove the curved plastic cover (3 screws) from the top-back of the outdrive. The waterpump will be under that cover...also unbolts with 3 screws. |
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| Author: | Road Racer [ Sun Aug 18, 2013 4:37 am ] |
| Post subject: | Re: Water circulation problems... |
rpengr wrote: Sounds like a definite YES. Water should come out within seconds of the engine starting. Does not matter if it is warmed up or not. Water would come out with the exhaust (through prop hub, and/or through bottom of exhaust bellows because the bellows usually have drain slots. 120deg temperature reading is probably incorrect if there is only AIR around the temp sensor. Fortunately it is very easy to change the impeller on the Cobra outdrive. Just remove the curved plastic cover (3 screws) from the top-back of the outdrive. The waterpump will be under that cover...also unbolts with 3 screws. Thank You... I will try to find an impeller today somewhere (Sunday)... |
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| Author: | Road Racer [ Sun Aug 18, 2013 8:43 am ] |
| Post subject: | Re: Water circulation problems... |
OK, I found a impeller kit in my boat junk box. I changed it and the water is now gushing out of my bellows... The bottom of my bellows is all worn out... How do I change the bellows??? DO I have to remove the drive? |
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| Author: | LouC [ Sun Aug 18, 2013 1:11 pm ] |
| Post subject: | Re: Water circulation problems... |
There are 2 bellows on a Cobra drive....the bottom one with the slits, is the exhaust bellows, the top one that you probably can hardly see is the u-joint bellows. If water comes out of the bottom one its OK..... |
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| Author: | rpengr [ Sun Aug 18, 2013 4:08 pm ] |
| Post subject: | Re: Water circulation problems... |
Road Racer wrote: OK, I found a impeller kit in my boat junk box. I changed it and the water is now gushing out of my bellows... The bottom of my bellows is all worn out... How do I change the bellows??? DO I have to remove the drive? Like Lou said, it is OK of the bottom bellows drains water. Most of them are made to do that. By that, I mean that they shaved the bottom of the "pleats" so that there are slots for water to drain out of. This is normal, so you don't need to replace it unless the rubber is in really bad condition. Now the upper bellows MUST be watertight, and must be replaced if there is any sign of rubber cracking or wear. The upper bellows surrounds your drive shaft and u-joints. |
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| Author: | LouC [ Sun Aug 18, 2013 4:22 pm ] |
| Post subject: | Re: Water circulation problems... |
In fact on my Cobra most of the water when running on the hose had exited from the transom mount underside right in front of the drive, not much from the prop at all... Your water temp on the muffs should be about 160* |
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| Author: | Road Racer [ Mon Aug 19, 2013 5:30 am ] |
| Post subject: | Re: Water circulation problems... |
Like Lou said, it is OK of the bottom bellows drains water. Most of them are made to do that. By that, I mean that they shaved the bottom of the "pleats" so that there are slots for water to drain out of. This is normal, so you don't need to replace it unless the rubber is in really bad condition. Now the upper bellows MUST be watertight, and must be replaced if there is any sign of rubber cracking or wear. The upper bellows surrounds your drive shaft and u-joints.[/quote] OK, I guess I panicked for nothing... The exhaust has slits on the bottom... I guess it is OK then. |
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| Author: | Road Racer [ Mon Aug 19, 2013 5:13 pm ] |
| Post subject: | Re: Water circulation problems... |
OK, now I have water coming out of the hose above the drive shaft bellows... It looks like there is hole right near the connector (boat side). I might be able to get in there and cut about a half inch off and reconnect... What is that hose for?? |
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| Author: | LouC [ Mon Aug 19, 2013 5:26 pm ] |
| Post subject: | Re: Water circulation problems... |
What, there is no hose above the drive shaft bellows....The drive shaft bellows is top bellows, you can barely see it unless you tilt up the drive. The exhaust bellows is the one below that with the slits. The only other hose is the smaller hose on the port side that feeds the water from the drive to the transom mount (like a 3/4" diameter water hose, just like the ones that go from the thermo housing to the exhaust manifolds). If there is water coming out of THAT, you have to pull the drive and pivot mount (bellhousing) and replace it. May as well do all the bellows at the same time. http://www.crowleymarine.com/johnson-ev ... /55840.cfm take a look at this...driveshaft bellows is part #76, exhaust bellows is #31, the smaller hose that feeds water to the transom mount from the outdrive is #37. So where is it leaking?? There is a plastic fitting in the pivot mount, that can crack (part#18) that can also cause a leak. Rare but it can happen if the boat is not winterized right. As you can see I've been in and around one of these for a while.... |
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| Author: | Road Racer [ Mon Aug 19, 2013 5:33 pm ] |
| Post subject: | Re: Water circulation problems... |
LouC wrote: What, there is no hose above the drive shaft bellows....The drive shaft bellows is top bellows, you can barely see it unless you tilt up the drive. The exhaust bellows is the one below that with the slits. The only other hose is the smaller hose on the port side that feeds the water from the drive to the transom mount (like a 3/4" diameter water hose, just like the ones that go from the thermo housing to the exhaust manifolds). If there is water coming out of THAT, you have to pull the drive and pivot mount (bellhousing) and replace it. May as well do all the bellows at the same time. http://www.crowleymarine.com/johnson-ev ... /55840.cfm take a look at this...driveshaft bellows is part #76, exhaust bellows is #31, the smaller hose that feeds water to the transom mount from the outdrive is #37. So where is it leaking?? There is a plastic fitting in the pivot mount, that can crack (part#18) that can also cause a leak. Rare but it can happen if the boat is not winterized right. As you can see I've been in and around one of these for a while.... Yes it is #37 and it is leaking up next to #74... I might be able to get in there and jut cut half inch off and reattach, what do you think? What is #73 bushing for? |
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| Author: | LouC [ Mon Aug 19, 2013 5:38 pm ] |
| Post subject: | Re: Water circulation problems... |
Well probably not a good idea, here's why, that hose is a specific length, so when the drive turns and tilts it does not yank the hose off the pipe it connects to. If that thing pops off, your engine will overheat in a heartbeat. You'll burn up the exhaust flappers, the rubber exhaust hoses and can damage the engine. This is one of those things you have to fix the right way. |
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| Author: | Road Racer [ Mon Aug 19, 2013 5:41 pm ] |
| Post subject: | Re: Water circulation problems... |
LouC wrote: Well probably not a good idea, here's why, that hose is a specific length, so when the drive turns and tilts it does not yank the hose off the pipe it connects to. If that thing pops off, your engine will overheat in a heartbeat. You'll burn up the exhaust flappers, the rubber exhaust hoses and can damage the engine. This is one of those things you have to fix the right way. Thank you for the advise. I will have to remove it and replace what I need. What do you think the approximate time for that project? I can handle a wrench... Also how are bellows installed? Transom side first or drive side first? |
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| Author: | LouC [ Mon Aug 19, 2013 5:51 pm ] |
| Post subject: | Re: Water circulation problems... |
Well it gets a little complicated...because you might have to disconnect the shift cable and that entails the somewhat complex Cobra shift adjustment routine... 1) remove outdrive, put shift in Neutral, support drive with a stand preferably, remove the nuts that hold on the trim ram rod, slide the rod out. Then remove the 6 nuts that hold the drive on, and pull it off. Its heavy (85 lbs so be careful). 2) now you'll be looking at the pivot housing, and can see in the upper bellows, there should be grease in there but no water. If there is water you need to replace the top bellows, and check the gimble bearing for smooth operation. While you are at it grease the gimble and the u-joints. 3) now you need to remove the two allen bolts (#26) that hold on the pivot housing (#77). With help you MIGHT be able to pull it back just a bit but do not kink the transom shift cable (#93/98) that sticks out of the right side of it. You may have just enough clearance to get to that hose then. If you can't then you have to get into the shift cable adjustment which takes too long to type even. Probably takes me less time to do than to type it LOL. 4) Then you get to put it all back together. Getting the drive on can be a challenge because you need to keep the driveshaft straight. The splines need to be greased with OMC triple guard grease and you need to use a new gasket (#100) coated with OMC gasket sealer. Time? Well I've gotten the drive off in less than 10 min but getting it back on could take 10, could take an hr, + a lot of cuss words so keep the young'ns inside. Allow the better part of a day, and make sure you have all the parts, because OMC parts often have to be ordered. |
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| Author: | Road Racer [ Mon Aug 19, 2013 6:08 pm ] |
| Post subject: | Re: Water circulation problems... |
Thanks again Lou, you have been a great help. Best Regards... |
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