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Groco Fresh Water Flush Kit

PostPosted: Sun Sep 15, 2013 7:21 pm
by Bruce
I am contemplating installing a Groco fresh water flush kit in my 1998 Camano hull # 84. After looking at the thru hull it appears to me that the threads may British as the initials BSP is stamped on thru hull valve that the tail piece connects to from raw water intake hose. Do any of the members know of or have any experience in this area. Thanks Bruce/Chasing Time

Re: Groco Fresh Water Flush Kit

PostPosted: Tue Jan 07, 2014 9:54 pm
by OpusV
Hi Bruce,
I sent some inquiries to some Camano owner friends of mine to try and get any additional information on your request. Didn't turn up anything.

That GROCO fitting looks pretty interesting. Let me know if you installed it and what you think about it's operation.

Thanks,
Kevin

Re: Groco Fresh Water Flush Kit

PostPosted: Thu Jan 09, 2014 2:14 pm
by Bruce
Hey There Kevin,

I did not think there was anybody else out there. I just installed the unit day before yesterday and it was truly a non event. All went well and it works as advertised. May I suggest going to http://www.defender.com to buy the unit as they truly have the best price around. Another hint would be to buy some additional replacement Orings as they will no doubt require replacement down the road. The number for the oring is 2-118 and they can be purchased directly from the GROCO website for about a buck each. My plan is put an 8 foot hose together using a mini inline ball valve which you can get from any hardware store. This will be connected to a fresh water source (via the right or left sliding window) and then connected to the flush valve via the Groco adapter. Once engine is started fresh water will be introduced, then, the raw water intake will be turn off via the raw water thru hull ball valve. (A piece of 1/2 inch X 4 foot PVC pipe, notched at one end is used to turn the raw water ball valve off keeping you out of the engine compartment while running)
I calculate there is approx 3 gallons of salt water inside our tamd 41PA engine. At 1000RPM you will consume about 1 1/2 gallons a minute. Three to five minutes is about all you will need to flush the entire engine. Obviously you can go longer as math never was my strong suit. One word of caution here.
Most marinas are not know for high water pressure so I have run my test between idle and 1000 rpm. If you have good water pressure from your fresh water source as I do then one might use 1500RPM however I believe that should be the MAX as a 1/2 to 3/4 hose can only delivery so much.
Lastly, fresh water source off while shutting the engine down. This I believe should be done simultaneously as you don't want the impeller to run dry for too long.

FYI, if you are interested I have also constructed a portable recirculation unit as I cleaned the entire cooling system with RYDLYME and was very pleased with the results. I then overhauled all of my coolers and heat exchangers afterwards and they required no cleaning after the RYYDLME treatment but that is another story as I tend to ramble when it comes to my Camano.....

Re: Groco Fresh Water Flush Kit

PostPosted: Sat Jan 11, 2014 11:57 am
by Bruce
Hi Kevin,

I answered your post several days ago however not sure what the delay is all about.

I did in fact install the Groco unit and it went very easy. I have done some test regarding water flow and RPM along with other thoughts which I will re-post should my other reply not be posted. In the interim should you have any questions please feel free to give me a call and we can chat.

Regards,
Bruce
"Chasing Time"
253-219-3772

Re: Groco Fresh Water Flush Kit

PostPosted: Wed Feb 05, 2014 10:26 am
by Bruce
Kevin, I installed the Groco fresh water kit and it was truly a no brainer. Works great and very easy to flush the engine. Takes about 5 minutes to do.
Give me a call if you have any questions or want to discuss further. Cell: 253-219-3772

Bruce
"Chasing Time"

Re: Groco Fresh Water Flush Kit

PostPosted: Sun Feb 09, 2014 11:09 am
by OpusV
Hi Bruce,
Thanks for the detailed information. I will have to add the Groco flush kit to the list of OPUS V improvements.

It would be interesting to know how much water the engine pumps at different RPMs. The idea of using the Groco as a self bailer is interesting although perhaps a danger to the engine if there was much debris in the bilge.

This does look like a clever way to winterize or flush the salt water out of the system when the boat is laid up over the winter. Glad to hear you are happy with the results.

Kevin

Re: Groco Fresh Water Flush Kit

PostPosted: Fri Dec 20, 2019 12:13 pm
by rbunz
Bruce,

Do you have any pictures? After having this a few years would you still use the Groco kit or plumb it in differently? Considering we have an intercooler and our boats sit for long periods this makes sense. Has anyone else done this?

A boat neighbor sent me these two links about the benefits of freshwater flush

https://www.sbmar.com/articles/the-bene ... cb05e6d10f

https://sbmar.us9.list-manage.com/track ... cb05e6d10f

//Rick

Re: Groco Fresh Water Flush Kit

PostPosted: Sat Dec 21, 2019 4:01 pm
by Bruce
Hello Rick,

The answer is absolutely. The GROCO fresh water attachment I feel, is the easiest and cleanest install. I use it religiously and have no doubt that it has extended the life of my coolers. Case and point. The small drain elbow that attaches to the bottom of my after cooler gave way and started to seep. Seems the factory installed a brass elbow instead of a correct bronze elbow. I decided to pulled the entire aftercooler to ensure there were no issues with the threads for the elbow. The threads were OK and, this gave me a chance to inspect the cooler element. It was perfect inside which was a good thing considering the cost of a new element. I should point out here that my coolers are 21 years old and they look great.
I am currently in Nashville thru 2 January. I can take a few pics for you upon my return. That said I am available to assist you should you decide to install the flush kit.
Merry Christmas.
Bruce

Re: Groco Fresh Water Flush Kit

PostPosted: Sun Dec 22, 2019 6:28 pm
by rbunz
Bruce,

Pics would be great!

Have a wonderful holiday!

//Rick

Re: Groco Fresh Water Flush Kit

PostPosted: Tue Jan 28, 2020 8:15 am
by dboyes
Bruce,

Locally, Vancouver Island, the Groco is not available but the local Chandlery sells the Perko Flush Pro. It is made of Clear Polymer which is interesting, did you ever consider this?

Regarding the Rydelyme flush system you built can you provide more detail please.

I’m going to install the Perko or Groco and while at it look at your Rydelyme invention.