| Author |
Message |
    
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1259
Registered: 11-2005
| | Posted on Tuesday, March 25, 2008 - 10:11 am: | 
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I have a yam st dr in shop...we r having &^%^##, ..
I inst a new imp,sherwood pump,on eng...will not pump water at low speed...we disc hoses,..raised both,filled both w/water,...at idle wont pump out disch hose...new imp,all looks fine...cooler clean for PS pump...WTF??...it HAS to pump,..if u have wtr in intake hose and out hose,keyed --OK,..shaft not slipping....no air leaks....will not pump....any thoughts.... |
Guy Gaspar
Senior Member
Username: guyjg
Post Number: 1766
Registered: 08-2006
| | Posted on Tuesday, March 25, 2008 - 10:39 am: |
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blockage in water hose? |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1261
Registered: 11-2005
| | Posted on Tuesday, March 25, 2008 - 10:54 am: |
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all clean & clear..hoses disc from everything...1 in and 1 out.. |
Guy Gaspar
Senior Member
Username: guyjg
Post Number: 1767
Registered: 08-2006
| | Posted on Tuesday, March 25, 2008 - 11:00 am: |
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If the pump is turning and water is not moving there is a blockage somewhere. Start disconnecting hoses at the closest point to the impeller and see if you have pressure. Continue along the line until you don't find pressure. |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1262
Registered: 11-2005
| | Posted on Tuesday, March 25, 2008 - 12:48 pm: |
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yep.....well known here....done all that...still noooo worky! |
Rick Sweeten
Senior Member
Username: linesix
Post Number: 1116
Registered: 11-2002
| | Posted on Tuesday, March 25, 2008 - 04:20 pm: |
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I got a little lost while following your path and I haven't worked on a Yamaha O/B since..., well, in a long time.
But I am understanding that you installed a new complete pump assy. If this is the case, is it the correct rotation pump? If you are installing an impeller only, it would be obvious if the diameter were wrong, but is the thickness correct?
If you have both hoses disconnected, raised up, filled with water and nothing is moving with the pump turning, there's no need to look at coolers, the problem is in the pump.
Double check the impeller, make sure the hub is not spun and the key is in place on the shaft. Confirm it is the correct rotation pump. If all these things are OK, put a different pump on it. |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1266
Registered: 11-2005
| | Posted on Wednesday, March 26, 2008 - 06:01 am: |
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thanks rick,...we r wking on a st drive......but,...my thoughts are yours...and we have ck'ed everything u have listed......thanks for you're opinions...... jwb |
Rick Sweeten
Senior Member
Username: linesix
Post Number: 1121
Registered: 11-2002
| | Posted on Wednesday, March 26, 2008 - 07:09 am: |
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I knew that, I meant to say I/O, not O/B. It sounds like it may be sucking air , maybe a torn seal or bent shaft? Let me know what you find.
Rick |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1269
Registered: 11-2005
| | Posted on Wednesday, March 26, 2008 - 07:23 am: |
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the customer has taken boat hm...i told him,the only thing i knew ,left to do,was replace the pump. and its about 400.00 or so,so i think he is going to keep messing w/it himself....
just fyi--shaft--ok...i was thinking a bad seal..but if bad enuf to cause the prob we r seeing,..i would think...it would be dripping...at the least??
thanks for your opinions.... |
Rick Sweeten
Senior Member
Username: linesix
Post Number: 1122
Registered: 11-2002
| | Posted on Wednesday, March 26, 2008 - 08:33 am: |
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It should have back to back seals. If one were bad it is possible to leak air in, but not water out, or visa versa. |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1271
Registered: 11-2005
| | Posted on Wednesday, March 26, 2008 - 08:40 pm: |
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that was my thoughts too,i was'nt aware of the btb seals tho.....thanks very much rick! |
Ken Nelson
Member
Username: captken
Post Number: 8
Registered: 07-2007
| | Posted on Wednesday, March 26, 2008 - 09:39 pm: |
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The pump is just worn out internally. How to check this is while the pump is off. Cover one outlet with your hand and suck on the other. If it pulls a vacuum, then the seals are good. Then remove your hand and see if you pull air past the impeller. If you can easily pull air, then its just worn out. Sherwood 991 pump. |
scott stephens
Senior Member
Username: scott_s
Post Number: 1199
Registered: 05-2006
| | Posted on Wednesday, March 26, 2008 - 10:53 pm: |
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two suggestions. #1 no longer applies as the boat is gone.
#1 pump shoe worn out.
#2 don't take yamaha stern drive jobs. parts rare, crappy drives, and a computerized ignition (yems) that even dealers don't have equipment to check. send 'em down the road. |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 1277
Registered: 11-2005
| | Posted on Thursday, March 27, 2008 - 06:27 am: |
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my thoughts-----are w/ scotts for sure..! |
Ken Nelson
Member
Username: captken
Post Number: 10
Registered: 07-2007
| | Posted on Thursday, April 03, 2008 - 04:32 pm: |
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Actually parts are easy for a dealer to get, computer is easy to trouble shoot with just the Yamaha flow chart. Many of our parts are now coming out of Japan direct and faster than the southeast warehouse. The drives are bulletproof unless the owners self destruct them by not checking the oil. We ship sterndrive parts almost daily all over the country. Pretty good profit item for us. |
scott stephens
Senior Member
Username: scott_s
Post Number: 1211
Registered: 05-2006
| | Posted on Thursday, April 03, 2008 - 09:26 pm: |
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with all due respect Ken, BALONEY. the last yam. I worked on needed manifolds. I ordered ( at over $1200 as I recall) and waited over three months before canceling order and modifying exhaust elbows to fit a set of mercruiser manifolds. ignition problem was presented to several people (including dealer) with no help. finally replaced entire system. the only good thing I can say about the entire ordeal was I found this site. (also no help, but I stuck around) I'll be glad to refer them all to you. |
cathy barlow
Visitor
| | Posted on Tuesday, June 17, 2008 - 09:08 pm: |
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Just surfing the web and came upon this site. We have a 1993 Glasstream 210 cc with a Yamaha sterndrive that we purchased 3 years ago and it's been a fabulous boat. Had to replace thermostat and impeller because 2nd year hubby started it up out of water (duh!). And then replace end of season because we were at a terrible marina, water was extremely low and sucked up alot of sand (happened to alot of boats there). No problem whatsoever in getting the parts locally. And we were told by the marina that got the parts for us that Yamaha made a very good sterndrive. As my husband says, Yamaha makes everything it does well. |
sean lutot
Member
Username: srrglu
Post Number: 11
Registered: 05-2007
| | Posted on Sunday, June 22, 2008 - 05:59 am: |
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How about sharing the info. Yamaha parts are better than gold.Where are you and what marina has parts??? Capt ken is the only one I have found for parts.share the web page or phone number! |
Cathy Barlow
Visitor
| | Posted on Tuesday, July 22, 2008 - 09:21 pm: |
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Sean, I live in central New York, near Syracuse. The website for the marina is listed below..It's Fremac Marina on Oneida Lake.
http://www.fremacmarine.com |
Ken Nelson
Member
Username: captken
Post Number: 14
Registered: 07-2007
| | Posted on Tuesday, July 22, 2008 - 09:30 pm: |
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Now for the bad news. Got noticed from my Yamaha Rep last week that they will not be shipping anymore sterndrive parts into the states from Japan after the first of the month. So after that, whatever is in the warehouse is it. |
sean lutot
Member
Username: srrglu
Post Number: 12
Registered: 05-2007
| | Posted on Saturday, July 26, 2008 - 03:14 pm: |
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I guess it will be time to re-power or bite the bullit and by new. it had to happen some time.
The yamaha stern drive party will be ending soon. |
Brett Peck
Visitor
| | Posted on Monday, July 28, 2008 - 07:41 pm: |
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i have a yamaha stern drive and this is a recurring problem with them....try checking the large hose that goes through the transom...if that has a crack, the system cannot create enough vacuum until you get moving....mine is cracked a small bit but it still keeps itself under 170 degrees....im just not ready to tear this thing apart....i havent gotten the clymer book for the sterndrive but everyone i kno that has this book says it makes it much easier to work on these things.
93 renken cuddy yamaha v-6 sterndrive |
