Do i need a reverse lock out valve
 

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.

Yeah your spot on there mate

if i bought the valve and installed it what would be the worse case senario???

i think that there was many bits that dont make sense. if it had the merc trans there isnt any signs of the mounting position for it. The mounts for this trans sit on the transom plate.

Worse case would be if you don't have the other parts to set it up.

You wouldn't see any signs. They use the same transom plate but there are no mounts on the Merc Trans bolting it up. The tailstock of the trans fits into the transom plate like the B-W and that is all that supports it. Their 9 inchs shorter than a B-W and the case is aluminum so their much lighter. Only thing you might see would be that the motor mounts would have been bolted to the stringers 9 inchs further to the rear. They have a reverse lock out bolted on top of them and the lines are the same as you explain yours.

Ahhh and im running an offshore mount so there isnt any mounts for the back of the engine apart from the mounts on the transom plate. i realy need to post some pics up for you to see just incase i have somthing major missing. im prety good with all this mechanical stuff its just hard when its non standard equipment

Thinking it may be easier for you just to replace the trim pump with the type that doesn't need the lock out valve and be done with it. You would also replace the 2 lines with one line that would go all the way from the pump to the manifold. To acess the line coming in through the transom you remove the manifold on the bottom of the gimble assembly outside the boat. Remove the 2 nuts and pull it down and you will see it connected to the inside of the manifold. Here's a thread about a guy that elimanated his.
http://forums.iboats.com/showthread.php?t=470072

AHHHH HAAAAAA i got a reverse lock out valve and hey presto it fits! your a champion mate it took a bit of elimination but we got there

the old one must have leaked or something and the owner before me must have chucked it

Jim's one of the good guys! He helped me out immensely during my TRS/Velvet transmission restoration/make over last winter. Sending me pics, links and PDF's of everything I needed to know. S#it I even bought hard to find parts from him. Thanks Jim,
Jason

Hey thanks for the good words Jason! I really find enjoyment being able to help out people when I can on here and on other sites I frequent.