Superjet won't turnover with plugs in

[tsturds]

I'm running into issues with a 62t 701 motor that I just put in my superjet and cannot figure out what the problem is. When the sparks plugs are out the motor will turnover just fine. Once I put the plugs in the motor will try to turnover, but it wont. I can turn the coupler easily by hand.

I've tried 2 different batteries both have about 12.5 volts. I get 12.5 volts at the relay and about 12 volts on the other side of the relay. Also get 11-11.7 volts at the starter. The ground is under a head bolt and was sanded down to make a good connection.

I also took the starter, bendix flywheel and stator from a running 650 motor and put them on the 701 and the issue still occurred. The 701 flywheel and bendix teeth were pretty worn, but the 650 are in good shape.

Is there something that I am missing? Any other troubleshooting ideas?

 

[Big Kahuna]

Your battery cables are shot most likely.

 

[tsturds]

I will replace those and see if that solves it. Would I still get 11 or so volts at the starter if that were the case?

Also within the crank case cover there is spring and washer where the bendix sits however there isn't anything where the bendix inserts near the starter. Is it missing a spring or washer on that side that could be causing it to hang up?

 

[Vumad]

Low voltage, bad starter or too much compression. Low voltage is battery, cables or starter.

 

[Freakrider]

I will replace those and see if that solves it. Would I still get 11 or so volts at the starter if that were the case?

Also within the crank case cover there is spring and washer where the bendix sits however there isn't anything where the bendix inserts near the starter. Is it missing a spring or washer on that side that could be causing it to hang up?

There should be a large washer between the case and bendix but that's not causing your issue. In the front cover there should be a washer on both sides of the spring, fyi. That 11 volts at the starter is not sufficient, check your cables and battery. My Deka 12 sits at 13 volts.

 

[CRJ]

I will replace those and see if that solves it. Would I still get 11 or so volts at the starter if that were the case?

Also within the crank case cover there is spring and washer where the bendix sits however there isn't anything where the bendix inserts near the starter. Is it missing a spring or washer on that side that could be causing it to hang up?

bad wires cause low amps, which cause low cranking umph.

 

[tsturds]

Thank you. I will swap out the cables and test the battery. Hopefully that does the trick.

 

[Just4Fun]

bad wires cause low amps, which cause low cranking umph.

Low voltage and dirty connections will raise amperage, it takes more energy to complete the circuit!

 

[CRJ]

Other issue could be the battery is shoowing decent voltage but has lost its cranking power. Not as common, but ive seen batteries show 14 volts and they wont spin over a ski.

 

[tsturds]

Other issue could be the battery is shoowing decent voltage but has lost its cranking power. Not as common, but ive seen batteries show 14 volts and they wont spin over a ski.

One battery is brand new but it's from wally world. The other one is a nicer sealed battery. Both Crank over my other superjet though no problem and that one is running 170psi compression.

There was some grease in the crankcase under and around the flywheel, is that normal?

 

[Lumpy]

If that were mine and i was replacing the battery cables, I would definitely move my ground from the head bolt to one of the starter bolts.

 

[tsturds]

So I ran jumper cables from the battery right to the post on the starter and from the battery to a bolt that secures the starter. Same thing. Turned over with no plugs in but wouldn't turn the motor over with them in.

 

[JetManiac]

Move the ground wire to the starter where it belongs.

 

[tsturds]

Move the ground wire to the starter where it belongs.

Just moved it. Sanded it all down to make a good connection. Same thing. Tries to turn but just makes a loud clunk in the front of the crank case.

Old bendix teeth and flywheel teeth were fairly worn. Could something in the crank case be loose causing bendix to disengage from flywheel?

 

[tsturds]

Battery is showing 12.6 volts. When I crank i get about 11.3 at the battery and 11.2 at the starter post.

Could both my batteries be junk? Or is this normal to have a drop?

 

[tsturds]

Used a jumper pack that cranks out 200-400 amps with the battery that cranks the other superjet and still the same thing.

Tried different wires for the negative and 2 positives and relocated ground.

Anything else that could be hanging it up?

Going to try a new battery tomorrow but I figured the jumper pack plus the battery that cranks the other superjet would be sufficient.

Just can't think of anything else to troubleshoot.

 

[OCD Solutions]

The brushes in the starter are spring loaded to keep them in contact with the armature.
When they seize, they stop advancing and start to burn back, (also arcing the crap out of the armature).
Once the gap gets too large, torque falls off and you start to loose cranking power.
This is why tapping on the side of a starter will work sometimes. It jars the brushes loose so they advance towards the armature again.

If you are in a bind or on a tight budget, you might be able to open it up and work some magic. Take care to get it sealed back up afterwards though.

Personally, it's the start of a new season so I would source a new or good used OEM to ensure I won't be revisiting this topic every 1-3 weeks the rest of the summer.

 

[tsturds]

Thank you! Pulled apart starter to try cleaning it before I order one. Anything look unusual?

 

[tsturds]

Took a slow-mo video of what it's doing with the case cover off. Even after cleaning both starters and re-doing wires the issue still persists. New starter? Any other causes?

 

[Freakie]

Hi

Stop testing your starter the way you are doing it.....there is no bushing location the end of the bendix as that sits inside the flywheel cover housing....so now you are stripping the bendix / starter gears as the whole thing is flopping around and grinding the teeth.

One of your starter brushes might not be making contact with the armature....they look a bit short / worn.....swop out the starter with a known good one, and then last...swop out the bendix with a known good one.....the bendix clutch might be slipping when the plugs are in.