Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 29-07-2020, 05:47   #16
Registered User

Join Date: Feb 2020
Location: Cleveland, Ohio
Posts: 19
Re: Mercruiser overheating on muffs

Got the water pump">raw water pump pulled last night but quickly discovered the previous owner left me with a broken bolt in the block

After 4 hours, left handed drill bits, easy-outs, cursing, praying, crying, anger, an finally acceptance, I finally got it out. That cost me about 2 years off my life expectancy!
Attached Thumbnails
Click image for larger version

Name:	Broken_bolt_1.jpg
Views:	8
Size:	248.7 KB
ID:	220244   Click image for larger version

Name:	Broken_bolt_2.jpg
Views:	8
Size:	152.0 KB
ID:	220245  

bheston is offline   Reply With Quote
Old 29-07-2020, 09:59   #17
Registered User

Join Date: Jan 2019
Location: currently Titusville
Boat: Catalina 350
Posts: 86
Re: Mercruiser overheating on muffs

most here have struggled with the broken bolt issue. it is good you found instead of just taking the back of the raw water pump off. that bolt is required to provide tension to the belt and support for the fuel pump action against its cam.


photos of those hoses?
__________________
Catalina 350,Bayliner 2855,SeaRay 180
The truth has coordinates!
Fiftybucks is offline   Reply With Quote
Old 29-07-2020, 10:17   #18
Registered User

Join Date: Feb 2020
Location: Cleveland, Ohio
Posts: 19
Re: Mercruiser overheating on muffs

Okay - I'm in "broken bolt" company.

I didn't get to take photos (yet) of the hoses but I will. I did get photos of the impeller and pump. The impeller was perfect - no damage at all. The pump is not what I expected. I bought the standard Mercruiser kit with housing and it not anywhere close. The boat is a 2010. Is this a newer pump or older pump design?
Attached Thumbnails
Click image for larger version

Name:	Pump1.jpg
Views:	11
Size:	160.9 KB
ID:	220268   Click image for larger version

Name:	Pump2.jpg
Views:	13
Size:	142.9 KB
ID:	220269  

Click image for larger version

Name:	Pump3.jpg
Views:	8
Size:	109.3 KB
ID:	220270  
bheston is offline   Reply With Quote
Old 29-07-2020, 11:05   #19
Registered User

Join Date: Jan 2019
Location: currently Titusville
Boat: Catalina 350
Posts: 86
Re: Mercruiser overheating on muffs

newer Gen7 Mercruiser partner Hardin Marine
supposedly better... almost any other design would be welcomed.

those part are available also. i'd replace and keep for emergency spare.


i did notice 2 different size hoses on the water pump... that fitting with the ball valve may very well be an engine inlet.
__________________
Catalina 350,Bayliner 2855,SeaRay 180
The truth has coordinates!
Fiftybucks is offline   Reply With Quote
Old 29-07-2020, 11:20   #20
Registered User

Join Date: Feb 2020
Location: Cleveland, Ohio
Posts: 19
Re: Mercruiser overheating on muffs

I think you might be right. Here is a terrible picture but one that shows a mystery black hose (I suspect from the through hull) joining a "Y" fitting with the red hose. The combination then connects to the back of the raw water pump.
Attached Thumbnails
Click image for larger version

Name:	Hoses_1.jpg
Views:	13
Size:	102.2 KB
ID:	220272  
bheston is offline   Reply With Quote
Old 29-07-2020, 18:10   #21
Registered User

Join Date: Nov 2013
Location: Slidell, La.
Boat: Morgan Classic 33
Posts: 2,253
Re: Mercruiser overheating on muffs

Well I think now we know why your pump wouldn't pickup from the garden hose. When you get it all put back together, put some kind of lubricant on the impeller, close the valve on the front pickup, hook up your muffs as before, and try again. Hard for the r/w pump to pull any suction when the front valve is open...

I'm betting that the previous owner had some run-ins with a few mud banks and clogged up the foot pickup so that his engine overheated, so when he installed the freshwater system he provided two pickups.

Can't say I like the idea, seems more like double the chance for screwups, rather that insurance against clogged intakes.

Would be good to know what outdrive you have, which would give us a better idea as to what advice to offer.

From the picture you supplied, the Mercruiser part number for the impeller you need is likely 47-59362T6, the Sierra (an aftermarket supplier) p/n is 18-3224, and the 'run-dry' impeller by Globe Rubber is 2001. Some people have pump wear problems with the globe impellers; I've used them without problems but they're expensive.

Your impeller looks fine to me, if there isn't any rubber rubbed off on the housing, it's probably good.
jimbunyard is offline   Reply With Quote
Old 29-07-2020, 18:45   #22
Registered User
 
Dennis.G's Avatar

Join Date: May 2011
Location: Sea of Cortez and the U.P. of Michigan
Boat: Celestial 48
Posts: 897
Re: Mercruiser overheating on muffs

Not in exact response to your issue as it seems your water intake is actually via a thru hull. That said, the clamp-on water muffs are a real hit or miss device. I could not get them to work properly on my small boat with Mercruiser outdrive. I got these instead and they do work well: https://www.wholesalemarine.com/flus...waAqlzEALw_wcB
Dennis.G is offline   Reply With Quote
Old 30-07-2020, 10:06   #23
Registered User

Join Date: Jan 2019
Location: currently Titusville
Boat: Catalina 350
Posts: 86
Re: Mercruiser overheating on muffs

DennisG.... those were the ones I have also. they work and don't slide off. I think if he closes that ball valve and tries again it will work as per Jimbunyard
__________________
Catalina 350,Bayliner 2855,SeaRay 180
The truth has coordinates!
Fiftybucks is offline   Reply With Quote
Old 30-07-2020, 10:40   #24
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,318
Re: Mercruiser overheating on muffs

I wouldn’t try it again before contacting a dealer.
However you should be able to discern if the foot and thru hull are interconnected by placing the muffs on and opening the water, if they are connected water will free flow out of the thru hull.
But it should also be running out of the exhaust, and it wasn’t
a64pilot is offline   Reply With Quote
Old 30-07-2020, 10:54   #25
Registered User

Join Date: Feb 2020
Location: Cleveland, Ohio
Posts: 19
Re: Mercruiser overheating on muffs

I bought a set of the factory Mercury muffs with the stainless steel rod as suggested. With the RW pump removed and the hoses laying in the bilge, I will install the muffs on the Bravo III outdrive and turn on the water (engine will not be running for these tests). I want to verify water flows out of the hose inside. Then, I will use a fake-a-lake and do the same for the through-hull intake. Again, to verify the water flows. There are one of two theories to be proven:

1) The boat has dual intake pick-ups: foot pick-up and the through-hull pick up.
or
2) The boat has a through-hull pick up only and the foot is blocked-off.
bheston is offline   Reply With Quote
Old 31-07-2020, 18:15   #26
Registered User

Join Date: Feb 2020
Location: Cleveland, Ohio
Posts: 19
Re: Mercruiser overheating on muffs

To close this topic and for others who may encounter the same issue, the problem is solved. I put the fake-a-lake on the through hull intake and duct taped the outdrive intake. Turned the water on and no water flowing out the RW hose disconnected in the bilge. Hmmm. I then swapped the water line to the outdrive with the Mercury made muffs and closed the ball valve on the through hull. Turned the water on but still no water out the RW hose inside the hull. I grabbed the shop vacuum and put vacuum on the hose as I ran the water. Once I gave it vacuum, the water was flowing in the hose. Keep in mind the engine is not running and the RW pump is not yet installed. I checked the through hull and sure enough, it flows too when I use the shop vac. I guess a standard garden hose may not have enough volume and pressure to push the water up especially if there is leakage at the muffs or fake-a-lake.

As suggested, I closed the through hull connection and the engine ran nice and cool with the Mercury muffs. Lesson learned, close the through hull port before running on muffs if you have dual pickup like me. Thanks for all who replied.
bheston is offline   Reply With Quote
Reply

Tags
cruise, cruiser, heating, overheating

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Brand new Mercruiser overheating vanderd Engines and Propulsion Systems 16 29-06-2018 07:44
mercruiser overheating - impeller good ?? fstarocka Engines and Propulsion Systems 19 25-05-2017 20:42
bell housing mercruiser cutbrain Propellers & Drive Systems 0 29-03-2009 08:59
Mercruiser Corrosion Protection Ripoff Chief Engineer Construction, Maintenance & Refit 2 23-10-2008 20:14
Mercruiser Bravo 3 Problem! Suggestions?? Alondra Powered Boats 7 05-08-2008 17:22

Advertise Here


All times are GMT -7. The time now is 18:47.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.