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Author Topic: Water pump backing plate  (Read 2437 times)
corvus5469
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Jerry


« on: October 21, 2012, 04:40:47 pm »

I am reading the book "How to Rebuild the Small Block Ford" and the author said it is unacceptable to replace the water pump on a SBF without the backing plate.  I have a SBF that I have put two water pumps on in the last 20 years and it has never had a backing plate.  I drove the car 750 miles  this summer, on Route 66, through New Mexico, in 95 degree heat, and temp. gage never got above normal.  Do any of you have a backing plate behind your water pump?  I am about to rebuild a 302 and want to know if spending 60 bucks for a backing plate is a waste of money.
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z-adamson
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« Reply #1 on: October 21, 2012, 04:49:48 pm »

Never seen or heard of a SBF water pump without a backing plate. Only ever used mechanical water pumps though, not sure about electric.
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tbird347
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« Reply #2 on: October 21, 2012, 05:10:21 pm »

Pre 1965 289 and the 221 and 260 ci motors had a timing cover that had a water pump without a backing plate.  I think some of the early hi po 289 used the early cover also.  This water pump can only be used on the specific timing cover.  Everything later needs the backing plate though.
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corvus5469
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Jerry


« Reply #3 on: October 21, 2012, 05:28:22 pm »

Pre 1965 289 and the 221 and 260 ci motors had a timing cover that had a water pump without a backing plate.  I think some of the early hi po 289 used the early cover also.  This water pump can only be used on the specific timing cover.  Everything later needs the backing plate though.

I have looked on the web sites of Rock Auto, Oreilly, and Autozone and none of those parts places have a listing for a small block ford water pump backing plate.  What parts store sells them?  Summit racing has them for electric water pumps.
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347HO
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« Reply #4 on: October 21, 2012, 06:22:47 pm »

I probably could make you one.
what year block or setup?

I have one for Fox setup.
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
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Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
tbird347
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« Reply #5 on: October 21, 2012, 06:24:48 pm »

I have never gotten a water pump that hasn't had the plate on it already.  Oem or aftermarket, they have always had the plate installed right out of the box.
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347HO
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« Reply #6 on: October 21, 2012, 06:28:17 pm »

Some pumps come self contained, others need the back plate to seal plenum and guide the water to the ports.
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
Javier
Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
95GTspeeddemon
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« Reply #7 on: October 21, 2012, 08:08:24 pm »

im 99% sure my sn95 does not have a plate
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95gt, 302, canfield 195's, canfield efi intake; efi sheetmetal elbow, 331 custom cam, 90mm accufab TB, 1 3/4 accufab LT's, 3in accufab h pipe, 3in magnapacks, 4.30's, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600. 12.9 @ 115 2.0 60' 1300DA
4dracer
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« Reply #8 on: October 22, 2012, 12:05:05 am »

  tbird347 is correct. Early 289's had a water pump that did not use a backing plate. I also ran one for about 20 years with no problems. I even used it on a 351 windsor. It was from a 64' 289 that I had. The timing cover is specific for the pump. If you have the pump off, look at the timing cover down at the bottom where the gasket seals to the pump. If there is a slot made into the gasket sealing surface at the bottom it has to have a backing plate. If the sealing surface is smooth with no slot don't use a backing plate. My water pump is a factory aluminum pump with passenger side inlet. Some of them had cast iron pumps. Hope this helps.
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Joel5.0
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« Reply #9 on: October 22, 2012, 08:46:50 am »

221-260-early 289 use a different timing cover/WP setup.









Late 289-302-351w require the backing plate because the timing cover was taken out of the flow control equation.... it now longer has the cavity required for the impeller.







1995 timing cover DOES have the WP ports/cavity..... IOW, no backing plate used.





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95GTspeeddemon
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« Reply #10 on: October 22, 2012, 10:18:41 am »

awesome info!
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95gt, 302, canfield 195's, canfield efi intake; efi sheetmetal elbow, 331 custom cam, 90mm accufab TB, 1 3/4 accufab LT's, 3in accufab h pipe, 3in magnapacks, 4.30's, solid bushing rear upper/lower team z suspension, team z tubular k member and A arms, front coil overs with strange 10 way all the way around. TKO600. 12.9 @ 115 2.0 60' 1300DA
corvus5469
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Jerry


« Reply #11 on: October 22, 2012, 09:22:51 pm »

221-260-early 289 use a different timing cover/WP setup.









Late 289-302-351w require the backing plate because the timing cover was taken out of the flow control equation.... it now longer has the cavity required for the impeller.







1995 timing cover DOES have the WP ports/cavity..... IOW, no backing plate used.







What great information.  I am making copies of all the pictures for my library.

Thanks

Jerry
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turbo2256
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« Reply #12 on: October 23, 2012, 12:59:05 am »

The pump in the timing cover in the old style with the volute in the timing cover and the newer version are more efficent. I was working on some cooling variations for a V engine for ford. I dont remember what engine, mite have been the 4.6. I mentioned about the old water pump setups were more effecent to the engineer. Bam 2 years later the old style reappeared in production.
The newer virsion should actually be an improvement over the old version.
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1990LTD
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« Reply #13 on: November 04, 2012, 02:27:19 pm »

I have two for a newer style (Crown Vic/Fox) water pump/timing cover if you need one.


I am pretty sure the Fox and Panther covers are the same, but I could be wrong.
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