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Old 06-18-2011, 07:03 PM   #1
brentom
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Default My 49 mercury water pump

Will 51 merc motor water pumps work on the 49? I have a donor 51 with the original flathead in tack and want to remove the water pumps and send to get rebuild then install in my 49 mercury and not have any downtime.

thanks in advance,

tom
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Old 06-18-2011, 07:17 PM   #2
51 MERC-CT
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Default Re: My 49 mercury water pump

No, the pulleys on '50 and '51 are narrow belt. (other than that the pumps are vertually the same)
You could transfer the whole '51 setup, crank pulley, fan and generator etc.

Last edited by 51 MERC-CT; 06-18-2011 at 07:58 PM.
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Old 06-20-2011, 04:50 PM   #3
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Default Re: My 49 mercury water pump

I believe the foot mount is also different on the '49

Jim
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Old 06-20-2011, 05:22 PM   #4
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Default Re: My 49 mercury water pump

Early 49 Merc pumps were oiler type with bushings plus the wide sheeve as already mentioned. Later pumps will work on a 49 if you put the wide belt sheeves on. FoMoCo made a coversion kit to use the biscuit type mounts with the spacer adapters. The old block shaped mounts are more available now than they were back in the 60s.

Kerby
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Old 10-01-2013, 01:44 PM   #5
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Default Re: My 49 mercury water pump

I am also looking for 49 Merc water pumps any info where I can buy sum or have mine rebuilt ? Thank for any info
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Old 10-01-2013, 01:50 PM   #6
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Default Re: My 49 mercury water pump

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Quote:
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I believe the foot mount is also different on the '49

Jim

Yes, the foot on a '49 Merc pump is different than the others. I was helping my buddy clean out some parts and was able to see them side-by-side. Clearly different and I think one year only.
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Old 10-01-2013, 01:51 PM   #7
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Default Re: My 49 mercury water pump

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Originally Posted by Bobs1953 View Post
I am also looking for 49 Merc water pumps any info where I can buy sum or have mine rebuilt ? Thank for any info

Are you going to Hershey? If so, my buddy will have two sets there for sale. Pretty cheap I may add.
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Old 10-01-2013, 01:58 PM   #8
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Default Re: My 49 mercury water pump

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I am also looking for 49 Merc water pumps any info where I can buy sum or have mine rebuilt ? Thank for any info
I have used these guys on several occasions and their work is top notch, very reasonable and, a quick turnaround. Call Tony and he will give you a run down on what they do. http://user.cavenet.com/tmac1/
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Old 10-01-2013, 01:58 PM   #9
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Default Re: My 49 mercury water pump

I think the 49 merc pump mount is about 1" higher than later ones and also 8ba.
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Old 10-01-2013, 03:10 PM   #10
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Default Re: My 49 mercury water pump

49'-51' Mercury car pump bodies all mount the same way using the same motor mounts
Attached Images
File Type: jpg 49 51.jpg (23.3 KB, 12 views)
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Old 10-01-2013, 04:08 PM   #11
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Default Re: My 49 mercury water pump

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I am also looking for 49 Merc water pumps any info where I can buy sum or have mine rebuilt ? Thank for any info
Give Skip Haney a call to have your water pumps rebuilt. His phone # is: 941-505-9085.
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Old 10-01-2013, 04:12 PM   #12
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Default Re: My 49 mercury water pump

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I am also looking for 49 Merc water pumps any info where I can buy sum or have mine rebuilt ? Thank for any info
Try shoeboxford ,com
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Old 10-03-2013, 11:47 AM   #13
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Default Re: My 49 mercury water pump

Can someone please post a photo of a 1949 and a 1951 Mercury water pump.
I always thought they were the same except for the pulleys. Thanks. Jim
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Old 10-03-2013, 12:29 PM   #14
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Default Re: My 49 mercury water pump

The only major difference in the casting has to do with the type of bearing arrangement. The early 49 pumps have a spring loaded oiler cup and uses a bushing/bearing combo inside the housing. The later design has the sealed double row bearing/shaft assembly to fit. The sheaves were wide belt in 49 with single belt for both pumps then went to narrow double offset belt set up in 50. The tall square rubber block front mount was replaced with the biscuit type mounts that had to have an adapter to make up the hight dimension difference & alignment difference. The front frame cross member is different for the early 49 set up. The later 49/51 biscuit type mount with the big hole is located slightly offset from the single smaller bolt hole of the earlier 49 mount due to the size of the hole that was required to make the biscuit type work.

As far as I'm aware, there is no dimensional difference externally on the housing castings.
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Old 10-03-2013, 12:40 PM   #15
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Default Re: My 49 mercury water pump

As stated the major difference is the pulleys with improvements to the bearings. And some of the late 51's had holes in the impellers supposedly to reduce cavitation.
Attached Images
File Type: jpg `49.jpg (94.0 KB, 15 views)
File Type: jpg 5051x.jpg (97.5 KB, 14 views)
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Old 10-03-2013, 06:43 PM   #16
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Default Re: My 49 mercury water pump

These have narrow pulleys and an 0CM part #, I guess they are '50-'51 Merc?
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File Type: jpg IMG_2930.jpg (58.6 KB, 5 views)
File Type: jpg IMG_2931.jpg (72.7 KB, 6 views)
File Type: jpg IMG_2932.jpg (61.0 KB, 6 views)
File Type: jpg IMG_2933.jpg (74.7 KB, 6 views)

Last edited by Randy; 10-05-2013 at 12:09 PM.
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Old 10-03-2013, 06:52 PM   #17
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Default Re: My 49 mercury water pump

If the 8CM pump has the hole for the oiler cup then it is an early 49 type. The OCM pumps were used through 1951 and had the sealed bearing/shaft assembly. Previous rebuilders may have converted the 8CM pump to the later configuration. Sometimes it is hard to tell the 8 from the 0 in the part number unless you beed blast them.
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