Hi Guys im runing a 454 to a velvet drive thats coupled to a TRS unit. Im running a PRESTOLITE PUMP for the trim side of things do i need a reverse lockout valve or not?

Yes. Without it the drive will lift up when you put it in reverse. Basically it's a valve which blocks the fluid flow in the line when you shift into reverse, otherwise it would push the fluid back to the pump as the drive lifts. Also it's not good to operate the trim when in reverse beings the fluid flow is being blocked in the line.

Thanks picklenjim

considering im runing a velvet drive what is the part number for the correct reverce lock out valve i require?

this engine and drive is so old its hard to find this information out

Also some pictures of a complete unit will help me greatly

It is Part #6 on this page.

http://www.mercruiserparts.com/Show_Pictures3.asp?dnbr= 13668&ivar=images/COMMON/18804.png&inbr=932&bnbr=36&bdesc=HYDRAULIC+PUMP+AN D+BRACKET%28III%2DIV%2DV%29+%28PRESTOLITE%29

The text editor is having trouble getting the whole thing as a hyperlink, so make sure to copy it all.

oh thats on the bottom of the pump its self. the strange thing is that the short hose that comes through the transom dosent fit the valve direct there is another hose that connects to it this leaves me with a male to male fitting senario. should i just thread a block of steel and drill a hole through it and screw both ends to the block or am i missing a part all togeather????

There were different prestolite pumps. There was the design with reverse lock out and ones that used an external reverse lock out. From what you say about the hoses it sounds like you need the external lock out.
Here is the one that needs it:
http://www.perfprotech.com/store/ass....aspx#assembly
Here's the one that doesn't:
http://www.perfprotech.com/store/ass....aspx#assembly
Here is the external reverse lock valve for BW trans:
http://www.perfprotech.com/store/ass....aspx#assembly

wirlybird
What boat is this and what year? Is this B-W the trans setup original to the boat? Why doesn't it have the reverse lock out now? Did someone convert to the B-W and not finish it? Just wondering if it may have had a Merc Trans ll in it originally.

The part number for the valve is 76812. It was used on several different applications. Problem is you will also need the correct lever and linkages for the B-W set up. Here is what it looks like but has a different lever on it. It goes between the 2 lines with the male fittings.
http://www.ebay.com/itm/Mercruiser-R...s_Gear&vxp=mtr

Thanks picklenjim
its a haines formula 233

the shift lever doesn't look anything like the one on ebay i will take some pictures of both and post them up. It looks like the one that doesn't require a reverse lockout. sure makes it hard when the drawings are so hard to see

By what you say you have one line coming in from the trim cylinders hanging loose with a male end fitting and you have a line from the pump with a male end fitting hanging loose. Reverse lock out goes between them. That's the way their setup. The line from the pump is probably a white plastic line which uses a compression type fitting. The one coming in through the transom is a heavier reinforced line with a flare type fitting. If it were the type that didn't use the valve the line coming in through the transom would go all the way to the pump.