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Its a long post so you can just read the TL R if you want. Raw water pump BD Marine I have a question about a pump if you wouldnt mind helping me out.
Rebuilding your Raw Water Pump Assembly First remove your boats battery as so the engine wont crank and injure you.
Mercruiser raw water pump problems. Situation 2 Youve been running all season long with no apparent temperature related issues. All of a sudden your engine overheats and forces you to shut down. After inspection you determine the water pump impeller has failed.
Its important to realize how a positive displacement pump functions and displacespumps water. 350 Mag raw water pump problems Hot weather dieseling is going to get worse each year as the gas companies make another penny profit. That is why a water cooled- fuel cooler is always offered on Mercruiser V8 carbs.
Hot carb and hot gas very rough and erratic idles. Mercruiser 46-807151A8 Sea Water Pump Failure - YouTube. It seems that too many Merc 496 owners have problems after impeller change outs and the problem 90 or more of the time is from just replacing the impeller only on the pump without dealing with the grooving that can and does appear on both inside and plate end of the pumps.
These groove is anything other that very slight in depth and quantity will cause the impeller not to seal properly at the ends and hence not be able to properly prime at start up and provide enough water. Mercruiser overheating- How to check raw water pump flow rate. It sounds like the impeller is damaged the water pressure on muffs is forcing water in keeping it cool the tub method water level 6 inches above the cavitation plate is the bare minimum for testing in.
You can check mercrusier parts site for the replacement number according to our marine tecs there have been no major issues with the water pumps on the 81 engines other than the difficult access to replace the impellers. My overheat problem has to be between the raw water intake and the brass water pump otherwise water would be coming out the exhaust. Mercruiser raw water pump diagram inspirational sea water pump for.
Mercruiser water pump repair parts sea water impeller 47 59362t 1 fits mercruiser engines with engine mounted sea water pumps. Fast shipping mercruiser raw sea water pump pulley. To service the Raw Water Pump it will have to be removed from the engine along with its bracket.
Its a fairly easy job although restriction to access can make removal and installation difficult. Rebuilding your Raw Water Pump Assembly First remove your boats battery as so the engine wont crank and injure you. Heres a simple test to see if the problem is from the Y fitting being installed on the inlet side of the raw water pump.
Next time out prior to starting motor crimp the hose to the heater right next to Y fitting hose clamp pliers or two bolts vise grips Start engine. Restrictions on the inlet side of the raw-water pump Of the pump could be design problems such as undersized plumbing. In addition it could be maintenance problems such as debris buildup in seacocks strainers or other components located on the suction side of the raw-water system.
Thats what a circulation waterpump is supposed to do. Push water into the engine to cool it. On the circulation pump on the bottom side is a weep hole.
If water weeps from this hole. Yes its time to replace it. Thats why the weep hole is there to indicate that the bush inside the pump is failing.
I can see how itd rust up yer pullys if leaking from this hole. More signs that its time to replace this part. There was oil in the pump.
My failure was not caused by a lack of lubricant. There is a seal in the pump that keeps water away from the lubricated bearings and shaft. That seal failed on my pump.
The telltale was a small amount of water dripping out of a small weep hole in the body of the pump. I noticed the weeping during my mandatory bilge inspection with. I have a 62 mercruiser.
During flush out it wasnt pumping water. Changed impeller of raw water pump old one did not look bad. On start up no water from outdrive idled up and water.
Mercruiser Gen 7 Sea Pumps - Possible Suction Issues. When replacing your stock Gen 7 raw water pump with a Hardin Marine stainless pump care must be taken to avoid air leaks. This is the same if you are rebuilding your existing Hardin pump as the same rules apply.
An air leak in any of several spots will cause the pump to not prime on initial start up and cause possible damage to the new impeller. Merc did have a few circulation pumps which had plastic impellors these would break and not circulate water properly The raw water pump would pump cold water into the pump and the front of the block but would not cirulate thus creating hot spots and cold spots at the same time. Engine MerCruiser Magnum EFI GEN Alfa One Operation And Maintenance Manual.
Llx efi Mercruiser utilizes a full flow closed cooling system on the dry joint exhaust their marine cooling systems both raw water and fresh water cooling systems. I want to confirm that the water pump is delivering proper flow after my replacement. Usually when you have a bad water pump impellar the engine will overheat at both low speed and high speed.
If you are under way and see your temp gauge too hot and you pull back to idle at slow speed and the temp stay hot or gets even hotter after idling for a while chances are good you have a bad water pump impellar provided the water intake is clear of debris. Raw water pump idler pulley bearing failure-gctid813218. This happened to me a couple weeks back now but Ive only just now had a chance to post about it.
Its a long post so you can just read the TL R if you want. TLR - My raw water pump idler pulley bearing failed it was a cheap and easy fix. But I am wondering about belt tension on that.
Replacing Mercruiser Stock Raw Water Pump on 350 MAG MPI-gctid406273. Below is a bit of an adventure I had with faulty Mercruiser water pumps – went through 3 of them in a span of 3 years. Finally decided to swap the belt driven pump for a crankshaft mounted pump – lower cost better design much easier annual.
To troubleshoot install a section of clear water hose at the input to the thermostat housing. If the boat is on a trailer attach a garden hose and ear muffs to the raw water intake on the lower unit. If the impeller is not working no water movement will be seen through the clear hose.
I have a 2006 mercruiser 50 mpi. My raw water pump is out and I am looking for a part number for the whole unit so I can swap it out. I believe my motor serial number is Thank you.
I am sorry to hear you are having these problems with your boat. I know that can be frustrating. Hopefully we can get you back on the water quickly.
Nitrile impellers are used for bilge pumping and for transfer duties where water is heavily contaminated for example by oil or diesel. Polyurethane impellers are used for ballast pumps on boats that tow wakeboarders. Check Your Raw Water Strainer.
Now is a good time to check and clean your raw water strainer since the thru-hull is closed. Raw water pump BD Marine I have a question about a pump if you wouldnt mind helping me out. I have a right hand rotation engine 1988 mercruiser inboard 57.
The pump is mounted on the starboard side of the engine with outlets to stern the pump is original it has the aluminum pully shaft housing and the plastic impeller housing and the.