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trainfan1/Rob 1973 Johnson 115 v4 Starting problems Stator/PowerPack?
wrote:
Rob,
Thanks a ton for the information. I tested the power pack and the
posts were in spec. 7-8 posts register 644 ohms. I also checked all
connections and electrical and everything seemed clean and tight.
With that all checked out is it safe to conclude the weak fire is the
stator? Or is there anything else I should check? The problem has
gotton worse. The motor has to really be spinning to fire. Took 2
batterys and a jump car to fire it off. Would a weak stator cause the
problem that need more rpms to fire? I know spec is about 350 rpm to
generate fire for this motor. New starter last season so its strong
cranking.
I got a reply post awhile back that the flywheel is keyed so removal
and replace isnt difficult as far as lining up crank no need to TDC it
all that. Is there any other parts I should consider replacing while
the flywheel is off. If you have part numbers that would be great.
MUCHO THANKS again for all your information and help
cheers,
Nathan
Nathan, you've already checked the check the resistance of the charge
coils, now check the sensor coils. Disconnect the leads (they are Black
w/White & White w/Black) from posts #2 & #4, and #9 & #12 of the power
pack. They should be 6-10 ohms, and not shorted to ground (~ ohms).
The charge coils you tested by checking the resistance of the brown &
brown/yellow leads (terminals #7 & #8) for 550-700 ohms, and again no
shorts to ground, sounds good.
AGAIN, You are still facing replacing the power pack... THIS NOW APPEARS
to be your problem... there really is not a bench test for the pack,
only to check all the other components and eliminate. I have not seen
the sensor coils or charge coils fail nearly as much as the power packs.
The power packs are available from NAPA or Sierra as #18-5753 (needed
for the first non-OEM replacement) with all the hardware, #18-5756 w/o
the hardware. If one or both of the sensors is faulty, the timer base
needs to be replaced, this is seperate from the stator/charge coil
assembly. The flywheel nut spec is 100-105 ft. lbs... but so far
everything checks out for you under the flywheel.
Rob
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