470 mercruiser rebuilt engine install questions

[stonyloam]

Well you can trust him, or you can ask to see the technical memorandum from Mercruiser stating that retorque is no longer necessary (that is a BIG change from the original manual and should be in writing someplace) or you can get a second opinion by calling an authorized Mercruiser service center in your area, or you can retorque. You can probably guess what I would do .

 

[aarons 470]

lol I know you would.
I will to, To be on safe side

 

[aarons 470]

I'm not quite there yet want to get wiring done first. But may as well ask now. Regarding sealants

What do you guys use on the intake? I was thinking is use the permatex aviation?

And exhaust manifold, nothing?

Carb probably nothing?

Valve cover gasket?

 

[aarons 470]

Ok wiring update with meter.

G is pin #8 so it's oil pressure

J and E are purple and strange. They are tied together in continuity but have no continuity at plug? They are both in same arm off harness but aren't connected physically. About 12" apart they branch out of the run. They are connected when I attach meter to each one. So it's a loop? But not to plug?

I is officially purple. It goes to pin #5 so it's choke. There is another wire that was added to it and it proceeds to positive coil in conjunction with purple/yellow that comes out of end of harness. They both were attached to the old coil on the positive. So not really sure what they are?

L is pin#2 it is 2 tan wires together. So negative coil
F is tan as well it's also negative coil

N brown goes to pin 10 so it's trim sender. Manual shows it going to a terminal block first then sender

 

[alldodge]

Always refer back to the wiring diagram it will help to understand what should happen

J and E are purple and strange. They are tied together in continuity but have no continuity at plug? They are both in same arm off harness but aren't connected physically. About 12" apart they branch out of the run. They are connected when I attach meter to each one. So it's a loop? But not to plug?

Key here is the wire is purple, so this is 12V when key is turned ON. You want 12V to power the coil and choke. So this should go between carb and coil +, this is probably the resistance wire for the coil run connection.

I is officially purple. It goes to pin #5 so it's choke. There is another wire that was added to it and it proceeds to positive coil in conjunction with purple/yellow that comes out of end of harness. They both were attached to the old coil on the positive. So not really sure what they are?

It should go to the choke. The purple/yellow should go to the slave and is used to give the coil full 12V during the start cycle.

L is pin#2 it is 2 tan wires together. So negative coil

If it comes actually from pin 2 then it should be Gray. Being there are two wires and you have continuity between them back to pin 2, this would tell me they are actually Gray. If this is correct then one would go to Negative coil and the other would go to the shift interrupter.

If it is Tan then it should come from pin 3 and go to the water temp sender

F is tan as well it's also negative coil

Does it go to a pin ?

N brown goes to pin 10 so it's trim sender. Manual shows it going to a terminal block first then sender

Agree IF there is a terminal block, otherwise it can connect straight to sender wire with a bonnet connector

I'm not quite there yet want to get wiring done first. But may as well ask now. Regarding sealants

What do you guys use on the intake? I was thinking is use the permatex aviation?

And exhaust manifold, nothing?

Carb probably nothing?

Valve cover gasket?

I use nothing on gaskets except on corners on V8 intakes. Since this is a 470 I'll let the 470 guys answer this one

 

[aarons 470]

F goes to a pin, pin that goes to negative coil #2 if I remember right.

L (2 tans but probably gray at one point like you mentioned. tied together with a small loom connector). also negative coil according to pin #2. what's weird is these wires are short, like 8" from plug, they wouldn't reach to negative coil its closer to front of engine?
They look like they were tied together from factory. So I'll branch a wire off it to negative coil, and another to shift interrupter?

Regarding J and E purple. they are connected but don't have a pin. Just want to verify. One goes to choke and other to coil?

I also goes to choke, so that's another purple to choke? Its def choke at pin.

Thanks again. Man the meter is sure handy I should have got one years ago!

 

[alldodge]

F goes to a pin, pin that goes to negative coil #2 if I remember right.

L (2 tans but probably gray at one point like you mentioned. tied together with a small loom connector). also negative coil according to pin #2. what's weird is these wires are short, like 8" from plug, they wouldn't reach to negative coil its closer to front of engine?
They look like they were tied together from factory. So I'll branch a wire off it to negative coil, and another to shift interrupter?

Just to clarify the pins we are discussing are all on the engine harness connecter (pins 1 thru 10)? Your saying that F and the two wires L all go to pin #2 ?

The two short wires, don't know may just be cut off. With them going to pin 2 they have to be for the tach and negative coil.

Regarding J and E purple. they are connected but don't have a pin. Just want to verify. One goes to choke and other to coil?

I also goes to choke, so that's another purple to choke? Its def choke at pin.!

That sounds correct, the wire should be a resistance wire. Once engine starts the 12V goes from the choke connection to the coil. Should be able to measure the resistance, and should be small

 

[aarons 470]

Ok. Yes F, and the double L wires go to pin 2

 

[alldodge]

Ok. Yes F, and the double L wires go to pin 2

Don't know why there would be three wires unless one went to the distributor, but the distributor should connect direct to coil -

Guess use only 2 of the wires

 

[aarons 470]

Don't know why there would be three wires unless one went to the distributor, but the distributor should connect direct to coil -

Guess use only 2 of the wires

L the double wires, they are short only 6-8" from plug. Could there be anything in that area they went to? They look original to harness.
I guess if there's nothing for them no worries.

And I'll send F the longer wire to negative coil.

Curious What does the negative wire to coil do? is it completely different than a ground?

 

[alldodge]

Curious What does the negative wire to coil do? is it completely different than a ground?

If ya have a look at the wiring diagram you can see it label Tach, it goes to the Tachometer. The other connection to the negative side of the coil goes to the distributor.

 

[aarons 470]

I forgot to ask about alternator single wire. Run wire to battery?

 

[aarons 470]

Want to double check this. from one of my first pictures of wiring, Wire A. Its yellow /red.

I have it written down as void but it goes to pin 7 with meter, which is the slave solenoid on block on drawing. So this is a good wire?
I think it was mixed up with the yellow reds that went to stator/regulator when I wrote void on it.

 

[aarons 470]

Ok so the 2 purple wires that are in different spots in the harness, which are looped together without a pin. They read 2.2 on the ohm meter. As you said this is probably the resistance loop wire.

It's now makes sense what the last owner did. They added a wire added to the choke connection that ran to the positive coil for the resistance wire. Looking at it it looks like a normal wire . Red and Says " 1000 watt universal"

So brings up more questions! Lol



should I remove the wire the last owner added and use the purple one? I wonder why they changed it?

I am going to use an igniter ignition to replace points if it matters.

 

[alldodge]

I forgot to ask about alternator single wire. Run wire to battery?

The ALT wire should go straight from the ALT to the starter post, which the battery is also connected to the same post

Want to double check this. from one of my first pictures of wiring, Wire A. Its yellow /red.

I have it written down as void but it goes to pin 7 with meter, which is the slave solenoid on block on drawing. So this is a good wire?
I think it was mixed up with the yellow reds that went to stator/regulator when I wrote void on it.

Correct the large Yel/Red remains and is the start circuit and it should come from the starter to the large terminal slave solenoid.
The small wire is not used that comes from the regulator and stator
But the small Yel/Red which comes from pin 7 is used and goes to the slave solenoid small terminal

Ok so the 2 purple wires that are in different spots in the harness, which are looped together without a pin. They read 2.2 on the ohm meter. As you said this is probably the resistance loop wire.

It's now makes sense what the last owner did. They added a wire added to the choke connection that ran to the positive coil for the resistance wire. Looking at it it looks like a normal wire . Red and Says " 1000 watt universal

So brings up more questions! Lol



should I remove the wire the last owner added and use the purple one? I wonder why they changed it?

I am going to use an igniter ignition to replace points if it matters.

The loop purple will not be used since your using the igniter, it would only be used with points, so do not connect
You should use the Red wire which was added, but also you should be using a coil designed for the ignitor

 

[aarons 470]

Cool thanks. Can I ground stuff to the flywheel cover? Bolt goes Into block.
Or does it have to be directly in the block?

 

[aarons 470]

Manual shows a ground stud going through flywheel house with a nut in the center. All I have are bolts. Do I need to pick up that stud?

Do you guys know where I can find a detail for the trim sender? the electrical main drawing we have been using just shows 2 connection points. I have 3, plus the ground. Not sure where my trim sender wire should hook to.

Green goes from sender to lift motor

Green and white goes from sender to small harness below sender.

Larger red wire goes from sender to another actuator? Not sure what it's called.

Is the sender the solenoid looking thing in front of picture? There's is another one that looks different to the left, it's a brown plastic.

The green wires and red wire come of the one in front with silver top.

 

[aarons 470]

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[aarons 470]

Ok another important one. So the yellow red that comes of right side of slave that's attached to block and goes to starter slave.

Does that wire go to the S or the R on the starter. slave?

And what gauge do you recomend on this?

 

[aarons 470]

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