40/40 Main Halyard Sheave

Boat Systems
1

I am looking for information on replacing the main halyard sheave on a 40/40, or correct Harken part number, or simply the diameter, width, and shaft size to save an extra trip up mast. I would think that this needs to be a very high load sheave / bearing.

thanks
Scott Dickens aboard Bella Blue

2

Scott - I would suggest that you contact Paul Dennis at Warren River BoatWorks in Warren river RI. 401-245-6949 or WRBtwks@aol.com. Paul completely reworked the mast on our 40/40 last year which included a new set of sheaves at the masthead including an accomodation for a spare main halyard. In addition he constructed and oversize jib box for the jib halyard and also included a spinaker halyard should we ever desire to add a spinaker. Very profesional, helpful and knowledgable is the best way to describe Paul. He oversaw the Freedom plant at one point so his knowledge base is extensive. Paul Langevin S/V Star Struck

3

The parts that you need come from Rig Rite. My 40/40 uses a NG1 Jib Box & has 60mm aluminum sheaves. Replace the pin/axle at the same time.

For the jib I used the NG1-4A, but would probably go with the NG1-4ABB which has ball bearings.

The main halyard uses an 85mm sheave. You can use either NG2-3A or NG2-3ABB (I use this one)

See http://www.rigrite.com/Spars/isomat_spars/isomat_sheaves.html

– Geoff

4

Thanks to you both, I have spoken to Paul in the past about several issues on Bella Blue. Didn’t want to bother him for more “free” advice. I will contact rigrite for pricing and availability. The reason I am looking at masthead is amount of effort to raise main. I just replaced the delrin bearings with torlon in the mast base Harken turning blocks and 1502 deck organizer. Prior to this change the electric winch was not capable of hoisting the main without at least one pause to avoid tripping the breaker, it is better now but still hard. I will be going up the mast for a visual, as the halyard seem free at masthead, but maybe not free enough. How hard are your mains to haul up? I know that if the electrics were to fail my wife would not be able to raise the main to full hoist.

5

I would also have a close look at the electrical connections, switches and relays in the supply to the winches, a poor connection with only a few ohms increase in resistance can significantly increase the current in the circuit as the joint heats up and the voltage drops.

6

Well, I went up the mast yesterday to verify sizes etc before I order. The main halyard sheave is 3" x 7/8" x 3/8" shaft, roller and ball bearing. which is the same size as the Harken h500 sheave as used in the smaller “big boat” blocks, of which Bella Blue has a dozen of for main sheet, mast turning blocks, etc; several of which I have just rebuilt. so I have “borrowed” a rebuilt sheave and will go up the mast as soon as the rolling stops.