Question about Yamaha Boating

1 Answer

I have a 2005 40 Yamaha 2 stroke that's not pumping water. Changed the water pump and have taken thermostat out and it's still barely pumping.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Yamaha Master
  • 1,586 Answers

Must be some obstruction in there. Probably just before the water pump of just after.

Posted on Oct 17, 2019

Ad

6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

its420_us

  • 316 Answers

SOURCE: Overheating engine

Check your oil dipstick for coolant, or a mucky substance. Your symptoms sound like a blown head gasket.

Posted on Jun 22, 2009

Anonymous

  • 69 Answers

SOURCE: 99 grand am gt overheating changed thermostat and

try priming the engine block & radiator with water though the hose's & any hose you can squeeze to pump out the air lock with the filler cap off when running, sounds too much air is is in the system & the pump won't work dry.
I had this problem a few times & I ended up practically forcing water into any hose I could re-attach quickly using a garden hose, as the heating system need's priming too !

Posted on Sep 21, 2009

Anonymous

  • 7 Answers

SOURCE: Overheating....changed waterpump/thermostat!

if your heater is working i would say you got a bad thermostat if it isnt blowing any hot air you probably have a blown head gasket

Posted on Oct 17, 2009

Anonymous

  • 13 Answers

SOURCE: Water pump is leaking on my 2001 Yamaha YZF 426 motorcycle.

First you remove the four 8mm bolt that attach the water pump cover to the side cover, the lowest bolt will drain the coolant. next you remove the coolant pipe with one 8mm bolt. The water pump cover like any part that has been in place for years may need some force to remove and that is why you will find two tabs around the outside of the pump cover for prying it off.

Once you have the cover off the impeller unscrews by way of a built in 10mm nut. This nut is right hand threaded and is removable by rotating it counter clockwise with preferably a 6 point socket as a 12 point socket may round the nut sides since the impeller and built in nut are made of aluminum.

To replace the twin seals (one for water/coolant and one for oil) you must remove the engine side cover from the motor and pull the impeller shaft out from the engine side of the cover. After the shaft has been removed the bearing is pulled out with a bearing puller or sometimes it can be removed by pushing it out from the outside in with a makeshift driver but the bearing can be damaged by this method and it is not recommended. The old seals can now be pulled out or pushed out from the opposite side.

To replace the new seals you must drive them in perpendicular to the impeller shaft with the manufacture markings to the inside. The water seal is installed from the outside and the oils seal from the inside.

There is a tool used for installing the seals called a seal driver but you could make one in a pinch. The seal driver makes contact with the outside diameter of the seal where it is solid and has a metal core. The inside diameter is soft and flexible and should not be used to push the seal in place however it can be used to keep the seal driver centered over the outer diameter and to keep the seal moving in a strait line perpendicular to the impeller shaft.

Once the new seals are in place they should be greased with some lithium soap based grease.

Install the bearing and reassemble the impeller shaft then you are ready to reassemble the engine side cover and water pump housing but make sure you spin the water pump impeller slowly as you install the engine side cover as the impeller shaft is driven off the engine shaft behind it and the shaft needs to be aligned in order for it to fall in place (do not try to force the cover on).

Posted on Dec 28, 2009

Charles Hunter

  • 107 Answers

SOURCE: i have 30 hp two stroke pull start yamaha outboard

yam water pumps are clever the offste centre causes the pump vanes to flex during rotation and at low RPM you have a displacement type pump, at high RPM water pressure forces the vanes to flex inwards and the pump becomes centrifugal, you can fit the impellar either way up so you cant fit it wrongly make sure your gaskets are ok and that the delivery pipe to the power haed is not leaking (try a hose on it) also make sure the little woodruff key or on some models the pin through the drive shaft which turns the pump is fitted ok, not much else that can be wrong!

Posted on Jul 21, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Have a 2 stroke 225 Yamaha outboard. Alarm for what I can tell for heat, an oil went off today. Runs fine at lower rpm, but goes off when it goes up beyond 21 rpm.


How long has it been since you changed your water pump? The pressure relief valve can also cause over heat issues if it is stuck.

May 12, 2017 | Yamaha Boating

1 Answer

Yamaha 115 4 stroke. Found a couple of quarts of water in oil. Compressions are around 150 all cyl. Thermostats was found stuck open. Where's the water coming from?


check around the back of the water pump impeller for corrosion holes that will be leaking water to the sump
could be corrosion around the oil holes in the head gaskets
talk wit a service center as it may be a common problem and they will be able to give you a closer idea

Nov 16, 2016 | Yamaha Motorcycles

1 Answer

98 grand cherokee little heat.heater hoses hot top rad warm bottom is cold collant barely luke warm


While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

Nov 14, 2013 | 1998 Jeep Grand Cherokee

1 Answer

Yamaha outboard water pump


sounds like you blew a gasket . find a dealer .

Jun 26, 2013 | Boating

1 Answer

1982 55 yamaha outboard ,water not coming out the water pump hole in strenght


First thing to check: Disconnect the tiny hose between the check outlet and the engine. Disconnect it at the engine side.
With an airgun, blow in the check hole from outside to engine side.
With an airgun, blow out the engine connection.
Start the engine, check waterflow out of the engine connector. If water, reconnect the hose and check the water at the checkpoint.
If still no water at the engine connection: replace the impeller!

Mar 28, 2013 | Clymer Marine Maintenance and Repair...

1 Answer

Overheating yz250f


Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.vitalmx.com/forums/Race-Shop,42/yz-250-overheating,1216349
YZ250 overheating again Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jul 10, 2012 | Yamaha YZ 250 Motorcycles

1 Answer

2000 FORD EXPEDITION OVERHEATING....changed thermostat,radiator cap, confirmed fan clutch is working, no radiator leak noted, changing coolant temperature sensor as a type...water pump not leaking or...


yes. the impellor on these engines have a tendency to come off the water pump.First you can see if the pump is working by removing a heater hose then have someone to start the engine. if the water sprays a good, solid stream out then the water pump is good. if the water just barely comes out or not at all then the pump is weak or "bad".

Aug 13, 2011 | Ford Expedition Cars & Trucks

2 Answers

I have a 98 yamaha 150 2 stroke outboard engine, when cruising about 23 mph she runs fine, but when i run her faster a alarm under the dash goes off in which i will slow it down to idle and the alarm will...


Although water is seen thru the tell tail hole, your engine is overheating. When were the thermostats replaced last? Water pump impeller may also be fatigued, and not pumping enough at high RPM's.

May 11, 2010 | Boating

1 Answer

Hi there i have a yamaha dtr 125 thats smokes


Assuming you are using two stroke engine oil, the pump is pumping too much into the gas. DO NOT use motor oil in the gas. If 2 stroke oil is being used, then get a new pump, fix the one you have or disconnect the pump and mix the oil with gas when you fill up. Four ounces of 2 stroke oil per gallon of gas equals the standard 32/1 fuel mix.

Apr 28, 2009 | 2003 Yamaha DT 125 R

Not finding what you are looking for?
Boating Logo

Related Topics:

39 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Boating Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Mike

Level 3 Expert

4363 Answers

Vincent G
Vincent G

Level 3 Expert

2361 Answers

Are you a Yamaha Boating Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...