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TOPIC: How to Drain the water from manifold and riser?

How to Drain the water from manifold and riser? 20 Sep 2017 05:17 #1

  • simon3055
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Hi there,

I just got a Bayliner 3055, I plan to replace the manifold and risers.
When I read the service manual, it mentioned to drain the water first, I have no idea how to do it.

A liitle about the boat, 1999 bayliner 3055 with twin 305 mercruiser 5.0 carburetor. the manifold is the central manifold.

I've got all mercruiser part, will do it this weekend. Any advise will be appreciated!

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How to Drain the water from manifold and riser? 20 Sep 2017 05:19 #2

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I got a quote about 2K for labors, I would like to save some $$$ if it is doable.

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How to Drain the water from manifold and riser? 20 Sep 2017 10:12 #3

  • Nauti Mike
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On the bottom center of the exhaust manifold there is a water elbow where the coolant hose attaches, it should have a drain plug on it else just remove the hose and it will drain both the manifold and riser.

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1997 Maxum 2400 SCR 5.7LX Bravo II

Mike

How to Drain the water from manifold and riser? 20 Sep 2017 11:33 #4

  • Squiddy
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Simon, I just did this job myself and glad to help you. I was talking to Nauti Mike about it on Maxum forum. It was not difficult and you can definitely do it yourself.
Make sure you have the gaskets for the manifold and elbow. A torque wrench is good to have also since you want to tighten the bolts in 3 steps.
There are numerous videos on youtube for doing this. A good tip that I used was to install stud bolts to facilitate removing the manifold. To do this, remove the two end bolts from the manifold and replace them with studs. Then remove the remaining bolts and slide the manifold off using the studs to support the weight. Studs also help with getting manifold and gasket aligned for install. Manifold bolts are .375 x 16 x 4inch. I got bolts and sawed off the heads and created slot for screwdriver. 3.5 inches is about right length.
I also needed to apply a little dilectric grease on then new elbow to help it slide into the rubber exhaust hose.
All went smoothly. You may want to change spark plugs while you got manifolds off.

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Randy
2006 Bayliner BR205
5.0 Carb, Alpha 1 Gen 2
Chesapeake, VA

How to Drain the water from manifold and riser? 20 Sep 2017 15:57 #5

  • builderdude
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Assuming the exhaust is raw water cooled you can drain as Mike suggested. Are you doing all four sets or just one? A good idea to look at them all while things are drained.

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Dave
Edmonds, WA
"THE FIX"
'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
.030 over-Vortec top end-part closed cooled
***The rebuild of my 2556***
www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556

How to Drain the water from manifold and riser? 20 Sep 2017 17:12 #6

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Thanks for the pictures, I am pretty sure it is a raw water cooling system, so where is the drain plug? is it the plug in the pic? I think I have the exactly exhaust elbow and manifold, I dont think I have the extra spacer.

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How to Drain the water from manifold and riser? 20 Sep 2017 17:14 #7

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Thanks, I am pretty sure it is a raw water cooling system, so where is the drain plug? it located at end of the manifold? should I throw a bucket to hold the water from the pipe? I think I have the exactly exhaust elbow and manifold, I dont think I have the extra spacer.

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How to Drain the water from manifold and riser? 20 Sep 2017 17:34 #8

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Attachment not found

Starboard side view, directly under the exhaust manifold

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Randy
2006 Bayliner BR205
5.0 Carb, Alpha 1 Gen 2
Chesapeake, VA

How to Drain the water from manifold and riser? 20 Sep 2017 18:29 #9

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There may not be an actual drain plug located at the elbow, like Mike said removing the hose from the elbow at the bottom of the exhaust manifold will drain the exhaust down.

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Dave
Edmonds, WA
"THE FIX"
'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
.030 over-Vortec top end-part closed cooled
***The rebuild of my 2556***
www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556

How to Drain the water from manifold and riser? 21 Sep 2017 03:53 #10

  • bhawes
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There is usually a blue drain plug (plastic of some sort), screwed into the bottom of the manifolds. If you haven't got a clear view of the bottom of the manifolds use a small mirror and a flashlight to locate it. Unscrew this plug and any residual water should drain out. The water hose has to come off regardless to change/remove the manifold, so I usually only remove the plugs for winterizing, but they can be removed prior to the hose if desired.

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Bob Hawes.
Kelowna, B.C.
1998 Trophy 2052 WA
4.3 Vortec, A1 G2

How to Drain the water from manifold and riser? 21 Sep 2017 21:35 #11

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Thanks guys, this place is amazing, I was so confused before.I will do it this Saturday and I will bring some pics for the record.

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