On July 18, 2020 at 8:58 PM "karkauai via groups.io" <karkauai@...> wrote:

I know a few SMo have repowered with the Yanmar 4JH4HTE.  The raw water pump is on the aft/starboard side next to the fuel tank. It's almost impossible for me to change the impeller without removing hoses and alternator, and even then it's hours of struggling and cussing before it's done.
I'm writing to ask others if they are having the same problem, and how they deal with it.  I'm considering removing that impeller and putting in a remote raw water pump. Previously mechanics have discouraged me from doing that, but I'm at wits end.

Any advice, thoughts, etc are greatly appreciated.

Kent
SM243
Kristy

On July 19, 2020 at 12:13 AM Mark Erdos <mcerdos@...> wrote:

Hi Kent,

 

I do mine by brail.

 

Are you using threaded impellers? These make a huge difference:

 

 

The above tool is used for installation and removal.

 

I have a little tool kit just for this job. It includes a nut-driver to remove the cover and a wrench for the impeller tool and the impeller tool.

 

Being left handed is an advantage.

 

When installing the impeller, use lots of dishwashing detergent to coat the blades. This lube allows it to go in smoothly. No need to worry about the orientation of the blades. It’ll correct itself on the first revolution. And, when you start the engine and see soapy water outside of the boat you know it is working.  

 

I leave a blue shop paper-towel under the raw water pump for the first few minutes the engine is running to check for any leaks.

 

Before I started using this tool I removed the components on that side of the engine. It is only few bolts and a couple of hoses. This made access to the pump very easy from the top. However, it made the job longer and cut into my beer time. Now I can change the impeller in about 15-20 minutes (if I don’t drop anything).

 

Hope this helps.

 

 

 

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 

From: main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On Behalf Of karkauai via groups.io
Sent: Saturday, July 18, 2020 2:58 PM
To: main@AmelYachtOwners.groups.io
Subject: [AmelYachtOwners] 110 HP Yanmar raw water pump access

 

I know a few SMo have repowered with the Yanmar 4JH4HTE.  The raw water pump is on the aft/starboard side next to the fuel tank. It's almost impossible for me to change the impeller without removing hoses and alternator, and even then it's hours of struggling and cussing before it's done.
I'm writing to ask others if they are having the same problem, and how they deal with it.  I'm considering removing that impeller and putting in a remote raw water pump. Previously mechanics have discouraged me from doing that, but I'm at wits end.

Any advice, thoughts, etc are greatly appreciated.

Kent
SM243
Kristy

Try using these using these thumb screws. They are so much easier then the ones supplied with the pump.
Fair Winds,
Eric
SM 376

https://www.mcmaster.com/screws/system-of-measurement~metric/thumb-screws/metric-stainless-steel-raised-knurled-head-thumb-screws/

On July 19, 2020 at 12:13 AM Mark Erdos <mcerdos@...> wrote:

On July 19, 2020 at 12:42 AM Mark Erdos <mcerdos@...> wrote:

Very cool! Thanks!

 

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 

From: eric [mailto:kimberlite@...]
Sent: Saturday, July 18, 2020 6:20 PM
To: main@AmelYachtOwners.groups.io; Mark Erdos
Subject: Re: [AmelYachtOwners] 110 HP Yanmar raw water pump access

 

Try using these using these thumb screws. They are so much easier then the ones supplied with the pump.
Fair Winds,
Eric
SM 376

https://www.mcmaster.com/screws/system-of-measurement~metric/thumb-screws/metric-stainless-steel-raised-knurled-head-thumb-screws/

On July 19, 2020 at 12:13 AM Mark Erdos <mcerdos@...> wrote:

Hi Kent,

 

I do mine by brail.

 

Are you using threaded impellers? These make a huge difference:

 

 

The above tool is used for installation and removal.

 

I have a little tool kit just for this job. It includes a nut-driver to remove the cover and a wrench for the impeller tool and the impeller tool.

 

Being left handed is an advantage.

 

When installing the impeller, use lots of dishwashing detergent to coat the blades. This lube allows it to go in smoothly. No need to worry about the orientation of the blades. It’ll correct itself on the first revolution. And, when you start the engine and see soapy water outside of the boat you know it is working.  

 

I leave a blue shop paper-towel under the raw water pump for the first few minutes the engine is running to check for any leaks.

 

Before I started using this tool I removed the components on that side of the engine. It is only few bolts and a couple of hoses. This made access to the pump very easy from the top. However, it made the job longer and cut into my beer time. Now I can change the impeller in about 15-20 minutes (if I don’t drop anything).

 

Hope this helps.

 

 

 

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 

From: main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On Behalf Of karkauai via groups.io
Sent: Saturday, July 18, 2020 2:58 PM
To: main@AmelYachtOwners.groups.io
Subject: [AmelYachtOwners] 110 HP Yanmar raw water pump access

 

I know a few SMo have repowered with the Yanmar 4JH4HTE.  The raw water pump is on the aft/starboard side next to the fuel tank. It's almost impossible for me to change the impeller without removing hoses and alternator, and even then it's hours of struggling and cussing before it's done.
I'm writing to ask others if they are having the same problem, and how they deal with it.  I'm considering removing that impeller and putting in a remote raw water pump. Previously mechanics have discouraged me from doing that, but I'm at wits end.

Any advice, thoughts, etc are greatly appreciated.

Kent
SM243
Kristy

 

 

On Jul 19, 2020, at 10:53 AM, karkauai via groups.io <karkauai@...> wrote:

Eric, Mark, and Bill,

Thanks for all the great suggestions. I am going to take all of them and keep the boat.

Mark, I have the impeller removal tool, but the last mechanic put it in backwards...Grrrr.

Thanks again,

Kent

On Jul 18, 2020 8:58 PM, "karkauai via groups.io" <karkauai@...> wrote:

I know a few SMo have repowered with the Yanmar 4JH4HTE.  The raw water pump is on the aft/starboard side next to the fuel tank. It's almost impossible for me to change the impeller without removing hoses and alternator, and even then it's hours of struggling and cussing before it's done.
I'm writing to ask others if they are having the same problem, and how they deal with it.  I'm considering removing that impeller and putting in a remote raw water pump. Previously mechanics have discouraged me from doing that, but I'm at wits end.

Any advice, thoughts, etc are greatly appreciated.

Kent
SM243
Kristy