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Old 09-13-2011, 11:37 PM   #1
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Default Distributor placement, drop

Are boats designed to be 180 out? Unless I'm on crack I have always gone to TDC on #1 and the rotor points to number one...... the new cap I just bought is 180 off from that, point past the starter?
This pic sucks but ONE is right of the wires that are showing? I just want to make sure I have this dropped in correctly. Any help would be awesome.


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Old 09-14-2011, 02:21 AM   #2
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Don't feel too bad, I don't care how hard I try, I am always 180deg off. Nothing bad happens, just a little back firing, then turn it 180 deg, and all is good.

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Old 09-14-2011, 02:22 AM   #3
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That looks right to me based on this diagram from the Mercruiser Manual (#17).
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File Type: jpg 5.7 Firing Order.JPG (24.3 KB, 11 views)
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Old 09-14-2011, 02:31 AM   #4
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Awesome diagram THANKS! I'll turn it 180
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Old 09-14-2011, 03:49 AM   #5
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Hold on now, I think you are good. The diagram shows #1 on the cap at the 5 o'clock position if looking from the rear (where the distributor is). Looking at your pic it seems to be right there right next to the blue butt splices (and right at the engine stand mount which is rear). So it seems like 5 o'clock there too unless I am looking at something backwards here
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Old 09-14-2011, 02:39 PM   #6
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But don't forget that there are two TDC's at #1. In other words, you can have #1 at TDC, but NOT on it's compression stroke. If #1 isn't on the compression stroke the dist rotor will actually be pointing 180 out - which I think is #6 on the cap. Remember the cam rotates only 1/2 a turn to each full turn of the crank.

Are you pre-priming that thing before installing it a lighting it off?

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Old 09-14-2011, 09:37 PM   #7
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@ about 2:05 in this video is my concern.

UNDER the cap.. the rotor is pointing at number ONE, because that's were I put it...... The cap on the other hand SAYS 6 (where the rotor is now, pointing at the number one cylinder under it).

It's just a GM 350... wondering why number one is not were number one always is.....? I can pull it and do a 180 and the rotor will match the cap on one, not a big deal.. just strange if you watch the video and this is the same thing I've done for 20 years.... It's just weird doing something new I guess....
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Old 09-14-2011, 09:38 PM   #8
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Absolutely will be primed prior to firing........
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Old 09-14-2011, 09:50 PM   #9
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Doesn't make any sense to me either. The reality is that you can call any one of the dist cap posts #1, and line up the rotor to point to that post, and have cyl #1 at TDC on the compression stoke, so long as you wire the rest up following the firing order.
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Old 09-14-2011, 11:00 PM   #10
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in order to find tdc..it's best to have the valve cover off so you can see the rockers moving..then move the crank by hand until you see the intake open and shut..that's compression...tdc fires on compression....as dan stated...any post can be assigned #1..but the rest of the firing order needs to be correct as the distributor spins...

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