Help needed badly

[Essexeddie]

Originally Posted by dsraven

is your truck 12volt? is the solenoid/bendix 12 volt? is the end of the starter gear ground up? possibly the starter gear is slipping or the solenoid isn't strong enough to "pull it in" all the way. yu could try bench testing to see if the drive engages all the way.
check all the connections from the battery to the starter, I mean like take them off, clean then and re-attach. ensure there is a good ground strap from the battery to the engine and frame. a lot of starter issues are a simple poor connection or a battery post terminal that "looks good" but when taken off it is black with corrosion so there is a lot of resistance. also. a lot of guys will overlook the ground cabling because they feel it is the positive terminals that do all the work because usually they are the corroded parts. in reality the negative cables do just as much work so everything needs to be bright and shiny. a star washer under the frameand engine ground cables is a great idea as well. it helps keep the connection tight and making good connections. lots of guys will forget to install a good ground cable to the frame and the engine as well.
just some thoughts

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[Essexeddie]

Originally Posted by Essexeddie

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Thanks for reply. Yes it's 12v and always understood that the truck was originally 6v which makes me think it's the wrong starter motor. It does start after I move the engine over slightly using the fan. Once it's turned it carries on.
I've always understood that the starters are adjustable with shims but this one doesn't. I'm stumped?
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[dsraven]

when it cranks over does it sound like it is turning as fast as it should be? check all the cables full length for bulges etc that would indicate corrosion inside the cable sheath. they may not be as bendy in some spots either which can indicate corrosion under the sheathing and poor conductivity. you could also do a voltage drop test to see if the cables are conducting as they should be with no resistance from corrosion or poor connections. if all connections, cables etc are good and it still cranks slow then I would remove it and have it checked out for rotational speed free running etc. a starter rebuild shop will know the specs and be able to test it.
if it is a key start, not a pedal on the floor, then it could be a bad solenoid, inside the solenoid is an electromagnet that is energized by the key and pulls in a plunger that contacts 2 points together. sort of like a big washer on the end of a plunger that is drawn back against two contact lugs. one lug is battery power and the other lug goes to the motor. that is how the starter gets power to the motor. anyway, over time or non-use the contacts can get corroded or worn so there is not a good contact anymore. the result is a starter with less power to turn because it is not seeing full voltage due to the resistance of the connection in the solenoid. the solenoid also pushes the starter gear out into the flywheel teeth, if it is a key style starter system, so if it isn't getting full power it may not contact all the way into the gear on the flywheel.
a pedal on the floor style starter has a mechanism that pushes the gear into the flywheel ring gear as it also pushes a switch, mechanically, to energize the starter motor. the contacts can get dirty or corroded as well as the linkage can also be out of adjustment so the gear is not fully engaging the flywheel ring gear. one issue could be a bad engine mount allowing the engine to move around which can affect the linkage. check it all out then get back to us. some pics would help.

[dsraven]

does your starter look like one of these? one is electrically operated solenoid switch and the other is the pedal on the floor mechanically operated switch.


http://pic20.picturetrail.com/VOL131.../214808855.jpg

http://jimcartertruckparts.com/image...arters%202.jpg