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351 crank pulley question |
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Live2fish 
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Joined: February-27-2024 Location: Hb,ca Status: Offline Points: 35 |
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 Topic: 351 crank pulley questionPosted: March-07-2024 at 7:09pm |
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I need to run an accessory with 2 belts off the engine, is there a 4 groove pulley for our engines or a way to run it?
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11116 |
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Posted: March-08-2024 at 7:53am |
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It's easy to find a 3 groove 3 bolt pulley with the same diameter as your original pulley (which should be 2 grooves and 3 mounting bolts) on an 81 PCM 351W
4 grooves 3 mounting bolts.............a little harder to find That's just the kinder gentler way of saying that nobody makes one unless you're getting one custom built or doing some adapting  Why does whatever it is that you're wanting to use need 2 drive belts?
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DayTony
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Joined: June-30-2013 Location: Salem MA Status: Offline Points: 832 |
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Posted: March-08-2024 at 8:05am |
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I assume you are planning on running a mechanical wash down or hyd hauler pump?
Summit or jegs or any of those online resources should have an options for a 3v groove pulley for SBF applications. 4v exists but is harder to source. but they are out there. Can also drive a crank pulley mounted hub to a jackshaft or direct mount a pulley driven pump with a lovejoy or similar connection. this is pretty common in the diesel inboard but i knew of someone running this setup on a ford 300 gasser.
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1988 Barefoot nautique-454
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: March-08-2024 at 8:13am |
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One could free up a groove with a johnson crank mounted pump and ditch the Sherwood
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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Live2fish
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Joined: February-27-2024 Location: Hb,ca Status: Offline Points: 35 |
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Posted: March-10-2024 at 8:13pm |
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Correct to drive a hydro pump.
Inside the cabin it’s a tight squeeze for room I’m looking for see how I can make this work… I’ve located a 4 groove 3 bolt pulley (actually a few, they were factory on some ford trucks) I just will have to figure out belt alignment for existing equipment if I switch then fab up a mount for the hydro |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11116 |
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Posted: March-11-2024 at 5:24am |
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I guess this pulley must have a part number and application that you forgot to mention.
I'd also guess, like you mentioned, that you'll have alignment issues with the circ water pump pulley, the alternator pump pulley and the raw water pump pulley and hopefully it's a smaller diameter than the original, since there's only 1/16 inch clearance between the crank pulley and the circ water pump pulley, otherwise you'll need a different pulley up there too. Good luck, it probably won't be easy at all. I guess you can't drive this hydro pump with one belt using a 3 groove pulley that's the same diameter and offset as your original pulley? That 3 groove pulley would be the one in the link below from CJ Pony Parts link to 3 groove 6 1/8 diameter like original You should verify with them that it's the same as the 2 groove pulley in the link below with one more groove added on the front link to 2 groove
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 917 |
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Posted: March-11-2024 at 11:15am |
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Live2fish...
Pretty sure I have a few Ford 3-groove pulleys that fit. OEM Ford 3-bolt. You can have one. Free. Send address to me at bcferrin15@gmail.com.
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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