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03-04-2017, 03:09 PM | #1 |
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Water pump for L31 with Serp
Installing aftermarket reverse flow water pump with serp system
Problem------original water pump pulley for serp system has different bolt hole pattern than new aftermarket pump (see pics) Anyone ran into this issue and have any solutions? Sorry pics rotated, not sure how to correct this |
03-04-2017, 03:50 PM | #2 |
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Re: Water pump for L31 with Serp
the stock pulley has a larger center bore & bolt pattern because the fan clutch screws onto the water pump hub rather than using the four bolts to hold it on
Last edited by B. W.; 03-05-2017 at 11:35 AM. |
03-04-2017, 05:14 PM | #3 |
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Re: Water pump for L31 with Serp
^^^^^^^^^^^^^^^^^^^^^^
you have a standard reverse rotation pump on your l31 , the truck is the same other than the hub and fan mount.. This was done, because of passed issues of people installing the wrong rotation pump on cars .. This set up, you get the pump and go that isn't the same.. I'll bet they make a pulley for the car pump that works with that whole set.. So you don't have to replace the pump.. as long as that pump IS a reverse rotation.. |
03-04-2017, 08:29 PM | #4 |
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Re: Water pump for L31 with Serp
The pump I purchased is a standard reverse rotation.
This one https://smile.amazon.com/dp/B01L0YPH..._prd_ttl_sol_0 |
03-04-2017, 08:51 PM | #5 |
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Re: Water pump for L31 with Serp
TBI trucks ran reverse rotation also. I couldn't tell you if a TBI pulley would line up or not.
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03-05-2017, 01:01 AM | #6 |
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Re: Water pump for L31 with Serp
The pulley you have is specific to the L30/31 Vortec water pump. What you need for your aftermarket water pump is a pulley for a '88-'95 TBI truck. I think it should line up with the other pulleys but I do not have experience with that to say for certain.
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03-05-2017, 12:33 PM | #7 |
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Re: Water pump for L31 with Serp
call the maker of the set up.. I'll bet they will swap pulleys..
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03-05-2017, 12:49 PM | #8 |
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Re: Water pump for L31 with Serp
From the OP's pics, it appears he is using stock L31 brackets
BW has TBI brackets on an L31 motor.
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03-05-2017, 08:31 PM | #9 | |
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Re: Water pump for L31 with Serp
Quote:
Captian Fab - 85-95 TBI pulley I think is smaller diameter. This is all I found so far- http://www.jegs.com/i/Chevrolet-Perf...85760/10002/-1 Last edited by 63frankintruck; 03-05-2017 at 08:41 PM. |
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03-06-2017, 07:31 AM | #10 | |
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Re: Water pump for L31 with Serp
Quote:
you want it to have the same rib count(if aplical)/width as your other pulleys . That part # above is for a bbc GM Replacement Water Pump Pulley - 1987-1995 Chevy/GMC Truck 7.4L & GM Serpentine Drive Kits - Big Block Chevy does not say gm serpentine drive kits- big and small block chevy.. I'd call and check first.. me I'd go get a pulley off a 1995-back tbi truck for 5 bucks at a junk yard.. as you need the balancer bolt and washer , the starter bolts (they are different thread /size than the 70's bolts) the dipstick tube and dipstick.. the coolant temp sender.. (threads and size is different than older engines.) I even took the plug wire holders.. Last edited by James the III; 03-06-2017 at 07:46 AM. |
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03-07-2017, 12:02 AM | #11 |
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Re: Water pump for L31 with Serp
The serpentine water pump pulleys are not ribbed. They are smooth since the back of the belt is wrapped around the water pump pulley.
I agree with just getting a '88-'95 TBI water pump pulley. The diameter is not that critical. The other alternative is to switch to the '96-'02 L30/31 water pump.
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03-07-2017, 05:50 PM | #12 |
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Re: Water pump for L31 with Serp
pulley diameter on 5.7 truck TBI is 5.75", vortec is the same diameter. Bolt pattern on TBI is 2.0" O.C.
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10-04-2017, 08:32 PM | #13 |
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Re: Water pump for L31 with Serp
How did this turn out?
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10-05-2017, 09:57 AM | #14 |
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Re: Water pump for L31 with Serp
I dont know what the OP did, but I have the L31 brackets on my 350 and I used a 88-95 water pump, pulley and thermostat housing. Its working fine, I have both the L31 and the TBI pulleys and the only difference between them is the center bore and bolt pattern. The diameter is the same.
Heres what I used and the year ranges 88-95 Water pump Pulley thermostat housing upper radiator hose 96-99 Bracket set Idler Tensioner Crank pulley Power steering pump and pulley A/c delete/compressor Belt 2003 5.3L (suburban or tahoe with 145A option) AD244 alternator Lower radiator hose, heater hoses and power steering lines are stock parts from my 1978 C10. I swapped the pressure line fitting from the original pump into the L31 pump to allow me to use the factory line.
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10-05-2017, 12:02 PM | #15 | |
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Re: Water pump for L31 with Serp
Quote:
Thanks for the info I was wondering if the TBI pump/pulley would line up correctly. AS for the power steering pump, I used the pump from my 79 vette when I added serp to it. It bolted on like it was made for it.
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