Jester Posted April 21, 2008 Report Share Posted April 21, 2008 I'm having a hell of a time trying to find a water pump that has the correct fan clutch on it. I told them I needed one for a NON a/c truck with the L20 and I got one with a bolt pattern for the fan of 5 1/4 (or so) inch spread. I measured the spread on the old water pump and it measures just over 4 inches. Come to find out, someone had put an a/c water pump in a NON a/c water pump box. Is the a/c equipt trucks water pump differant? I have a new NON a/c pump that will be here Monday. Hopefully it fits. Perhaps I have a pump and fan from a car? Are they differant? Thoughts? Any help would be great. Quote Link to comment
datsunaholic Posted April 21, 2008 Report Share Posted April 21, 2008 The car ones are actually larger than the truck ones. Quote Link to comment
Jester Posted April 21, 2008 Author Report Share Posted April 21, 2008 Well, hopefully the one that is coming today will be right. Quote Link to comment
Jester Posted April 22, 2008 Author Report Share Posted April 22, 2008 This might not be of too much importance to some, but, I thought I would share my findings. The larger diameter fan clutch is for the trucks equipt with a/c and the smaller diameter is for the non a/c trucks. My new one I got today was the right one. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 well my truck HAD A/C, but i removed it....... which one WOULD i use if i still ran my stock fan? Quote Link to comment
Jester Posted April 22, 2008 Author Report Share Posted April 22, 2008 If your bolt circle is about 5 inches, you need the one that is FOR a/c. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 is there any gain from swapping the pulley to a non A/C one? Quote Link to comment
Jester Posted April 22, 2008 Author Report Share Posted April 22, 2008 Not sure how you would change the pulley. Perhaps you could take the fan clutch apart and take it off the pump to get access. I think I still have my old pump, I'll take it apart and see if the pulley can be taken off. Quote Link to comment
]2eDeYe Posted April 22, 2008 Report Share Posted April 22, 2008 is there any gain from swapping the pulley to a non A/C one? If you swap to a non clutch style, you don't have to worry about the fan clutch going out. I personally dislike fan clutches...I replaced/locked up way to many of them. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 i am running an electric fan....and by running i mean, i bought one, and i have already removed the mech. one, but installation wont happen till the dash wiring is done. so the pulley is smaller? Quote Link to comment
]2eDeYe Posted April 22, 2008 Report Share Posted April 22, 2008 The pulley is the same size. The clutch is different. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 damnit..... Quote Link to comment
]2eDeYe Posted April 22, 2008 Report Share Posted April 22, 2008 If you want to change the pulley size get a pully from a 280zx. It is a smaller diameter pulley and will increase flow. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 could i get an underdrive or overdrive pulley for the 280Z online and it work? Quote Link to comment
]2eDeYe Posted April 22, 2008 Report Share Posted April 22, 2008 Theoretically? Yes The regular 280Z pulley is smaller than the 620 pulley...so it will spin faster. You will need shims to get it to line up with your crank pulley (you can get these at any parts store) Quote Link to comment
pl521sss Posted April 22, 2008 Report Share Posted April 22, 2008 2eDeYe;54317']If you want to change the pulley size get a pully from a 280zx. It is a smaller diameter pulley and will increase flow. How much smaller is it? Will it work on a non clutch fan? More flow will help this summer. Quote Link to comment
]2eDeYe Posted April 22, 2008 Report Share Posted April 22, 2008 Not sure the size difference. It's an obvious difference though. The pulley's are 4 bolt, non fan clutch pulleys. You will need a water pump without the fan clutch, earlier L series don't have the clutch so you could do a direct swap. I'm not sure of the year cut off though. I have a 280ZX water pump for mine. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 so just go to the parts store and get a 280z water pump and toss it on? you notice any difference? what size shims did you use? Quote Link to comment
datzenmike Posted April 22, 2008 Report Share Posted April 22, 2008 The car ones are actually larger than the truck ones. The Z20E has taller vanes set in a deeper pump cavity, pulley is the same diameter, plastic fan blades are different diameter bolt pattern. Will fit the L20B timing cover no prob. L20B water pump http://i138.photobucket.com/albums/q251/datzenmike/Lenginewaterpump.jpg[/img]"] Z20E water pump http://i138.photobucket.com/albums/q251/datzenmike/motorLwaterpump.jpg[/img]"] L and Z series clutch fans. http://i138.photobucket.com/albums/q251/datzenmike/motorLandZ20Ewaterpumps003.jpg[/img]"] Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 before i buy this, is this the one i would need? http://cgi.ebay.com/ebaymotors/WATER-PUMP-NISSAN-240Z-260Z-280Z-810-MAXIMA-DATSUN-NEW_W0QQcmdZViewItemQQcategoryZ33604QQihZ016QQitemZ260231210501QQrdZ1QQsspagenameZWDVW Quote Link to comment
]2eDeYe Posted April 22, 2008 Report Share Posted April 22, 2008 Haven't run mine yet, truck is still in pieces :P Ryan in SD (Seattle) ran one though and if I remember right the pulley groove was about 1/4" off. His truck ran cool, but he also had a 160 deg thermostat, an aluminum radiator out of a VW and an electric fan (no mech. fan). Man that was a sweet truck :) Edit: I wouldn't buy a waterpump off of ebay....I would get it from Rockauto or a local parts house to be sure I got the correct part... Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 but it bolts up and fits fine right? how do you get the fan clutch off? Quote Link to comment
datzenmike Posted April 22, 2008 Report Share Posted April 22, 2008 Fan clutches are integral with the pump. You cannot separate them or remove pulley. Quote Link to comment
Llittle_Llama Posted April 22, 2008 Report Share Posted April 22, 2008 damn, so im stuck with that damn clutch thing sitting on my damn pulley? what if i cut it off with my angle grinder? any problems you see with that? i went to the parts store and i ordered a 79 280ZX water pump for 25 dollars, imma install it tomorrow me thinks :D Quote Link to comment
datsunaholic Posted April 23, 2008 Report Share Posted April 23, 2008 The clutch part holds the pulley part on... it's a press fit. Just get a non-clutch pump for a L16/L18 and beg around for the pulley itself. That's what I have on my 4X4 (well, I have a flex-fan on it too, but it's still a L16 pump/pulley on a 1980 L20B). It's the 280Z/ZX pump/pulley that have the weird offset. Quote Link to comment
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