Clutch replacement, Nissan 720 4x4

[Datsun pickup]

What is the valve placement when at compression tdc?

[Datsun pickup]

With the engine at tdc.

 

the position of the rotor.

 

The position of the cam lobes first (top) second (bottom).

[datzenmike]

 

There should be a contact at 9 o'clock, toward the radiator for the intake side terminals, and another at around 4:30 o'clock for the exhaust side plugs.

 

1 I and 1E below...

 

 

 

[Datsun pickup]

With the engine at compression tdc and the shaft at about the 11:25 position, this is the position of the rotor.

 

[banzai510(hainz)]

Im confused Datsunpickup

Yesterdays photo 10 25am shows it at 9 o clock.at TDC

 

today its at 3 o clock at TDC

Edited October 11, 2023 by banzai510(hainz)

[Datsun pickup]

I just adjusted it today.

[banzai510(hainz)]

I will let MIke handle this but if true

 

1I will be where 4I is then start the rotation CCW with the fire order and plug number(going by the drawing wire nomenclature)

 

Like this is 180 deg off. like the oil pump dist shaft was installed 180 out.

[datzenmike]

Unbolt the distributor and lift it out. Remove the two 10mm? bolts on the pedestal that secure the distributor to the timing cover and your timing won't be altered when you put it back in.

 

Look in the hole and you should see this...

 

 

It's important to note that there are a small and a large half moon shape because the blade shape is slightly off set so the distributor can only fit back in in that one position.

 

If you are absolutely sure you are TDC on #1 compression and both valves are shut and the small moon is on the right there are two things you can do...

 

1/ rearrange the plug wires on the cap to match the intake one and exhaust one above the rotor contacts then move all the other wires 3, 4 2 firing order in a counter clockwise direction.

or

2/ remove the oil pump and drop the oil pump/distributor drive spindle turn 180 and reinstall so your small half moon is to the left the same as the picture above.

 

 

[Datsun pickup]

My shaft is in the same position as the picture above with the small side towards the radiator.

 

also both of my ignition coils are doing 2.1 ohms, is this good or do they need replaced?

Edited October 11, 2023 by Datsun pickup

[datzenmike]

The distributor can only fit in the one position so slip it in. The outer ring of wires on the cap are the intake, the inner ring are the exhaust. The intake rotor should have a contact facing out at 9 o'clock or forward towards the radiator. The inner rotor contact roughly to 4:30. As viewed from the driver side fender.

 

 

You only replace coils when they don't work. Are they Nissan or after market? Are the coils disconnected? Otherwise you may be reading something through the wire harness or distributor. If you are reading anything then the wiring is unbroken inside and should be fine.

[Datsun pickup]

The coils were connected when I tested them, they are not Nissan, but are same style as original.

[datzenmike]

Originals are 1.0 to 1.3 ohms primary and 8,500 to 12,500 ohms secondary.

 

I prefer to keep everything original if possible.

[Datsun pickup]

My Weber carb is exploding bursts of fuel out, here is a picture what is oozing out the gasket.

[datzenmike]

Warmed up and idling, look down the throat with the air filter off. Is it dripping fuel?

 

Yes? It's flooding. This can be incorrect float height, dirt caught in the inlet needle valve preventing it from closing or too much fuel pump pressure.

[banzai510(hainz)]

that carb looks new.

[Datsun pickup]

The carburetor was flooded, but I couldn’t get the fuel evaporated out.

[datzenmike]

Well the flooding cause need to be found and corrected first. Webers seem to not like over 3 psi unless new or it can push past the needle valve. Another flooding cause is dirt caught in the needle valve so it won't close, having the float set too high and choke stuck on.

 

You can take the spark plugs out and spin the engine with the starter to dry it out.

 

Starter shouldn't be run more than 15 seconds at a time and then 30 seconds of rest to prevent heat build up. If it's going to start it will do so in just a few seconds so continuous cranking is a waste of time and starter.

[banzai510(hainz)]

sometime sdirt can prevent the needle valve from closing letting gas in

or the level is wrong(which I never seen on a weber)

maybe the float has a hole and sunk.

 

I only run stock fuel pumps so never exp too much pressure,  or have a regulator on a elelctric low pres pump

[Datsun pickup]

My engine is not getting spark, the coils have pretty much no voltage when cranking.

[datzenmike]

You are all over the place. Now you're back to no spark from the coils. Again. After Oct 11th I assumed you had this fixed and had moved on to the carburetor. Pick a problem and stick with it till fixed.

[Datsun pickup]

Is there any way I can get a wiring diagram for a 1985 Nissan 720?

[Datsun pickup]

Do I need an ignition condenser and resistor for the engine to get spark on both sides?

[datzenmike]

No.

 

If the exhaust side is not firing (could be the intake side as the two coil wires can easily be switched) change the first fuse on the left side of the fuse box.

[Datsun pickup]

I have already changed the first fuse and it didn’t do anything. The intake side is sparking, and the exhaust side isn’t.

[datzenmike]

Check for power on both coil positive terminals with ignition on.

 

Check and confirm there is power on both fuse terminals.