rear rise to center rise conversion

[#1colt]

Ive posted on this topic before. My boat is a 76 sea ray srv 195 It has the octopuss set up with a 302(888). It was overheating before and i put new risers on it. It was fine for awhile and then it started acting up again. So i pulled the manifolds and the starboard side hade a crack that was somehow leting exhaust in to my cooling system, but not water into my engine. Thank god for that.

Heres my question, I Called up ebasic and they said itd be cheaper to get a center rise kit than to buy two new manifolds of the older style.
So i agreed and they" sent me everything id need". They sent me a new thermostat housing that has a total of four hose hook ups. One from the circulation pump, One from the outdrive pump, and then two exit holes. Made perfect sense to me until i opened the manifolds.

Thats where i ran into a head scratcher. They each have holes on the front and back and then each riser has a hole on the front. The boxes did each come with a total of 4 plugs that thread into the holes. If i didnt use the plugs thatd be 3 holes on each side of the motor. If i did use them wich holes should i plug?

The part that confuses me the most is the new manifold and risers have the same amount of holes as the old ones. the only difference is the new ones didnt come with restrictor plates for the risers just pass thru gaskets.

Other than that couldnt i just use the old thermostat housing ,and with minor hose routing adjustments,hook the hoses from that housing to the new manifolds? Instaed of using the new $100.00 housing they sent me. Then again everything happens for a reason right?

I ask all this just as a second oppinion, and this is a gold mine of expierence and knowledge. Thanks again in advance Mike

 

[Haut Medoc]

Re: rear rise to center rise conversion

HMMMMM.......
I'd say that without the restricter plate that you would not need to plumb anything to the risers....
Thus leaving four hoses to deal with......
Not sure what that would do for hot spots, but it sounds like it should work......
The best you can do is hook it up like I suggest & check with the pointer temp gun for hot spots or use your old housing & plumb it like before....
They should throw some directions in there, though.....
Hope this helps......​

 

[#1colt]

Re: rear rise to center rise conversion

That was my thinking as well, but the thing that throws me is why would they send me a housing that only has two exits.

Im assuming the thinking was to just plumb them through the front of the manifolds? That just doesnt seem right to me. It seems like that create hot spots in the back of the manifolds.

you dont know how the cooling system is set up on newer boats or where i could find that info do you?

Thanks again mike

 

[Haut Medoc]

Re: rear rise to center rise conversion

I don't know what to say, other than thats what I would do.....
You will not harm it in the short term by hooking it up either way, but without knowing the internal flow of the mans. themselves I can't answer.....
You need to call the place you bought them & ask......​

 

[#1colt]

Re: rear rise to center rise conversion

I really appreciate the input. Theyr glm center rise manifolds.

They shipped them with one plug already threaded into the rear of each manifold. To me it just seems like one feed hose to the front would leave hot spots.Maybe thats just because Im use to lifting the hatch and seeing a thousand hoses?

When i get some more time im guessing ill just hook them up like that and see what happens.

Any other ideas?

Once again thanks for the help.
Mike

 

[Haut Medoc]

Re: rear rise to center rise conversion

No, but if they came with plugs in the back, possibly they are designed to flow from front to back & up & out.......
I would try to contact GLM & see what there reccomendation on plumbing is......
They should be able to have a definative answer on how to use their product, IMHO......
That is where I would start before I plumbed anything......​

 

[Chris1956]

Re: rear rise to center rise conversion

Mike, My '88 4.3LX V6 Alpha had center risers and six hoses on the thermo cover. Two went to the bottom center of the manifolds, two went to the front of the risers, one went to the circulating pump and the final hose was raw water input from the outdrive. The manifold to riser gasket had two slots and two holes, thus restricting some of the manifold flow. Also the riser water supply had spring driven check balls to induce pressure in the engine. This was the old style cooling system. On your setup, I would put the water intake elbows on the bottom center of the manifold, and try to get some riser gaskets with four slots, so you get some good flow thru the risers.

 

[wire knot]

Re: rear rise to center rise conversion

#1 colt
I changed my man. to the same 1 u mention. From ebasic, local picup.
They instucted me to plumb to the front on the man.
have about 75 hrs and all seems good.

Your therm housing sounds a little diff. (4 outlets)
I say plum to front of man. and check the temp of the risers.
MIne are hot to the touch but I can leave my hand on there maybe 10 sec.

 

[Haut Medoc]

Re: rear rise to center rise conversion

I thought this thread looked familiar....​

 

[erikgreen]

Re: rear rise to center rise conversion

It's all good though. I'm going to order one of these kits soon too, and I was wondering if anyone had an experience with 'em

Erik