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Old 03-12-2016, 08:21 PM   #121
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Guess I never really looked that hard.

I would think the spline engagement if fine as the design is so that it cannot bottom out against where the splines stop.

Regarding the o-ring I never thought they did much. The drive shaft bellows seals water from entering and the gimbal bearing has an inner grease seal to keep grease from falling into the bilge.

Hard shifting is normal if the engine is not running.
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Old 03-12-2016, 08:22 PM   #122
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I figured the o ring should go to the coupler to try and keep some grease from escaping
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Old 03-12-2016, 08:25 PM   #123
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I figured the o ring should go to the coupler to try and keep some grease from escaping
Cannot happen the splines end way before the o-ring. The shaft can only go into the coupler as far as the splines.
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Old 03-12-2016, 11:27 PM   #124
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Making progress. Went on easier than I expected. Got my rebuilt water pumps back on too.
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Old 03-20-2016, 12:45 AM   #125
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Does anyone know the difference between trim rams with casting numbers 98718/98719 verse 98703/98704? My boat had one set on one side, and the other number set on the other... I'm guessing they are interchangeable, just an updated number, but I'd like to know for sure.
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Old 03-21-2016, 12:58 PM   #126
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Tabman is from Bennett and pokes his head in from time to time. He might be able to help.
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Old 03-25-2016, 12:14 AM   #127
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Tabman is from Bennett and pokes his head in from time to time. He might be able to help.

He does trim tabs... I was talking about the trim cylinders for the Bravo drives...
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Old 04-02-2016, 10:51 PM   #128
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So I now have both engines running on the hose with the original raw water cooling. Is it normal for the manifolds to be quite hot while the elbows stay cool?
For switching them over to fresh water cooling, is there already a cap available to plug the water fitting on the exhaust elbows? And am I supposed to open up the manifold gasket on the sides where it only has a small hole and isn't cut out to the size of the water jacket passage?
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Old 04-03-2016, 04:01 AM   #129
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I do not guess and use a hand held IR temp sensor and take readings to get the temps then I can know if things are too hot or not.

I thought you were using a partial closed system so the entire exhaust will be raw water cooled. The gasket are only fully open on two sides.

If the manifolds are to be part of the closed system there are gaskets that have no openings and block any flow to the risers.
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Old 04-03-2016, 10:27 AM   #130
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The manifolds are going to remain raw water cooled. So I leave the gasket alone?
What about a cap for the elbow? Right now, water goes to the bottom of the manifolds and to the front of the elbows. But with the heat exchanger, there are only water lines to go to the bottom of the manifolds.
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Old 04-03-2016, 11:25 AM   #131
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Yep gasket stay as is. The fitting on the elbow has to be removed and a brass pipe plug installed.
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Old 04-03-2016, 11:34 AM   #132
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Yep gasket stay as is. The fitting on the elbow has to be removed and a brass pipe plug installed.


I don't believe the fitting is removable. I think it's either pressed in or part of the casting. These are stainless steel Mercruiser elbows, which I assume was an upgrade someone did at one point..?
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Old 04-03-2016, 12:03 PM   #133
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I don't believe the fitting is removable. I think it's either pressed in or part of the casting. These are stainless steel Mercruiser elbows, which I assume was an upgrade someone did at one point..?
These are rare and I have seem them once before, yes the hose barb is part of the SS casting. Guess you'll have to come up with a custom cap.
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Old 04-03-2016, 12:04 PM   #134
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These are rare and I have seem them once before, yes the hose barb is part of the SS casting. Guess you'll have to come up with a custom cap.


Are they desirable? They look perfect.
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Old 04-03-2016, 01:18 PM   #135
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Are they desirable? They look perfect.
Desirable? I don't think many folks even know of them. Why do you ask?
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Old 04-03-2016, 01:18 PM   #136
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Just curious. Seems like a good investment. If only the manifolds were stainless, too...
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Old 04-03-2016, 01:21 PM   #137
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Is there a good way to judge the life left of the exhaust manifolds? Like thickness of the metal between the exhaust and water jackets...?
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Old 04-03-2016, 01:21 PM   #138
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Just curious. Seems like a good investment. If only the manifolds were stainless, too...
Yep to my knowledge merc only made SS elbows for a few years but never manifolds.

The ones I saw were on a 91' used in salt water are still look great.
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Old 04-19-2016, 01:16 PM   #139
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So I found some manifolds locally for the one engine I was concerned about. I have to replace the elbow gaskets I just put on because they already started to stick and tore when I took the elbows off.
But as I'm looking for another set of gaskets, I see they're described as "restricted flow". Is this meant for raw water cooling to evenly distribute water flowing to the manifold and elbow? Should I enlarge the two small holes on each gasket to increase flow since all the water will be entering just the manifold?
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Old 04-19-2016, 05:56 PM   #140
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So I found some manifolds locally for the one engine I was concerned about. I have to replace the elbow gaskets I just put on because they already started to stick and tore when I took the elbows off.
But as I'm looking for another set of gaskets, I see they're described as "restricted flow". Is this meant for raw water cooling to evenly distribute water flowing to the manifold and elbow? Should I enlarge the two small holes on each gasket to increase flow since all the water will be entering just the manifold?

I have used both in the past and frankly did not notice any difference when taking temps with an IR sensor.
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