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Need HELP with D6 Starting Engine Clutch

Need HELP with D6 Starting Engine Clutch

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desoto
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I have a D6,318 engine, with a pony motor. The pony motor runs good. When I try to start the 318 engine by way of the pony motor it will not turn over the 318 motor. It stops real fast like the 318 is locked up. I notice that the lever that engages the starting engine clutch feels like it is is not disengaging from the STARTER PINION BRAKE APPLIED POSITION. The lever moves but there is no spring type action as indicated in the manual. Anybody with suggestion would be greatly appreciated. Thanking those that respond to my help. Ed
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Wed, Nov 14, 2007 5:40 AM
SJ
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You know I,m sure that the compartment there takes oil in it for operation. To get a little look in there to what,s going on you should take the 3 bolts out of the lever bracket & pull it out & take a look in there & see what may be wrong and then go from there.If there was no oil in there it might have fused the brake parts together in there so if you take the cover off as I suggested you will get a better look in there.
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Wed, Nov 14, 2007 6:43 AM
Kid at Heart
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Reply to SJ:
You know I,m sure that the compartment there takes oil in it for operation. To get a little look in there to what,s going on you should take the 3 bolts out of the lever bracket & pull it out & take a look in there & see what may be wrong and then go from there.If there was no oil in there it might have fused the brake parts together in there so if you take the cover off as I suggested you will get a better look in there.
Can you spin the main over by hand, with the compression released?

David
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Wed, Nov 14, 2007 7:05 AM
ccjersey
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Reply to Kid at Heart:
Can you spin the main over by hand, with the compression released?

David
Some or all of the pinion clutches have a top cover that you can remove to adjust the clutch that should allow you to see the brake area on the front of the pinion shaft. Those brakes usually have very little authority so I doubt it is the trouble.

Maybe the main clutch is frozen up? Have you tried to crank it with the transmission in neutral? that would eliminate everything except rear mount CCU etc and it should turn over even with the main clutch stuck. Not sure where it will get you even if you do get the main engine started, you will know it is ok I guess.

If the pinion isn't engaged in the flywheel, you should be able to engage the pinion clutch and still roll the pony motor over easily. Try it engaged (lever Forward) and disengaged (lever centered), lever back is braking the pinion. And as Kid says you should be able to pull the decompression and roll the diesel over with the fan belt. Between the two, you should be able to diagnose what is stuck.

If the pinion is engaged already, it can be hard to turn the main engine over.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄
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Wed, Nov 14, 2007 8:45 PM
Denis
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D6 9U starter pinion clutch shaft bent

I can't really help since I am knew to this, but I can say I have a very similar problem, and took the advice to remove the clutch, and I discovered a bent pinion shaft. When I was trying to engage it it would stall the pony engine real fast, as you described, and to make sure I turned the main engine with the fan belt and it turned fine, so I knew the problem was somewhere in between. Now I am trying to get more information on the engagement arm lever that is inside, and what may have cause the shaft to bend, was it simply wear and tear over the years? My manual show the diagram for the pinion clutch, but does not provide information on the end of the shaft, what part may be missing there, and what the inside engagement lever is supposed to look like, the end of it is a little mangled and I am wondering if something broke off it, and should it be replaced as well? Is it possible that a part that is in between to make contact between the shaft and lever would have fell down and needs to be retrieved?

Anyone that can help I would appreciate it greatly as winter is coming and the snow here is wet and heavy... eventually we need the cat to move the snow banks...

Denis
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Wed, Sep 28, 2011 12:12 AM
Old Magnet
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Reply to Denis:



D6 9U starter pinion clutch shaft bent

I can't really help since I am knew to this, but I can say I have a very similar problem, and took the advice to remove the clutch, and I discovered a bent pinion shaft. When I was trying to engage it it would stall the pony engine real fast, as you described, and to make sure I turned the main engine with the fan belt and it turned fine, so I knew the problem was somewhere in between. Now I am trying to get more information on the engagement arm lever that is inside, and what may have cause the shaft to bend, was it simply wear and tear over the years? My manual show the diagram for the pinion clutch, but does not provide information on the end of the shaft, what part may be missing there, and what the inside engagement lever is supposed to look like, the end of it is a little mangled and I am wondering if something broke off it, and should it be replaced as well? Is it possible that a part that is in between to make contact between the shaft and lever would have fell down and needs to be retrieved?

Anyone that can help I would appreciate it greatly as winter is coming and the snow here is wet and heavy... eventually we need the cat to move the snow banks...

Denis
What's the serial number of your D6? The clutch brakes are different between early and late units. Pretty unusual to bend the main shaft. Something drastic would have to occur to cause that.

Here is a typical clutch/brake lever housing:
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Wed, Sep 28, 2011 3:45 AM
chumduffy
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Reply to Old Magnet:
What's the serial number of your D6? The clutch brakes are different between early and late units. Pretty unusual to bend the main shaft. Something drastic would have to occur to cause that.

Here is a typical clutch/brake lever housing:
you did not mention when or where this happend. its not on common to have water frozen in the transmisson,clutch,towing winch compartments not allowing the engine to move if transmission is in gear. also if the transmission and winch are in gear at the same time with master clutch engaged and winch break set the engine will not turn.
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Thu, Sep 29, 2011 7:25 AM
Denis
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Reply to Old Magnet:
What's the serial number of your D6? The clutch brakes are different between early and late units. Pretty unusual to bend the main shaft. Something drastic would have to occur to cause that.

Here is a typical clutch/brake lever housing:
[quote="Old Magnet"]What's the serial number of your D6? The clutch brakes are different between early and late units. Pretty unusual to bend the main shaft. Something drastic would have to occur to cause that.

Here is a typical clutch/brake lever housing:[/quote]

Thanks for your reply... the shop would also like to know the serial number and suggested a few places to look, no luck so far. Anyway, I got some help to attempt to fix the clutch, they recommended ordering the whole unit in working order for about $600, as opposed to rebuilding this one for much more money. Still you are absolutely right, whatever caused it I don't want it to happen again. I did not notice anything special the last time it ran. I simply attempted to start it someday and that was that. When I removed the clutch the end piece (that fit over the shaft) fell off and the bolts on it where gone, broken. There seemed to be oil in all the right places, but obviously the clutch brake was not functioning for years, so that may have caused the shaft to bend from the excessive grinding over time? No One ever told me I should fix the brake, unfortunately.

I have learned quite a few things from reading posts on this site and managed to get things this far, I really appreciate this resource and the information you all share, hope things will work out before winter, thanks
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Sat, Oct 29, 2011 8:45 AM
Old Magnet
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Reply to Denis:
[quote="Old Magnet"]What's the serial number of your D6? The clutch brakes are different between early and late units. Pretty unusual to bend the main shaft. Something drastic would have to occur to cause that.

Here is a typical clutch/brake lever housing:[/quote]

Thanks for your reply... the shop would also like to know the serial number and suggested a few places to look, no luck so far. Anyway, I got some help to attempt to fix the clutch, they recommended ordering the whole unit in working order for about $600, as opposed to rebuilding this one for much more money. Still you are absolutely right, whatever caused it I don't want it to happen again. I did not notice anything special the last time it ran. I simply attempted to start it someday and that was that. When I removed the clutch the end piece (that fit over the shaft) fell off and the bolts on it where gone, broken. There seemed to be oil in all the right places, but obviously the clutch brake was not functioning for years, so that may have caused the shaft to bend from the excessive grinding over time? No One ever told me I should fix the brake, unfortunately.

I have learned quite a few things from reading posts on this site and managed to get things this far, I really appreciate this resource and the information you all share, hope things will work out before winter, thanks
If I'm following you right it seems the end plate is broken/missing. This also carries the shaft support bearing so it's no wonder the shaft got bent from flopping around in there. Kind of an unusual failure though. Replacing the assembly is the way to go if your not comfortable with repairs.

Here are the s/n locations plus some are stamped on the sump flange as shown, about under the transfer pump. Even if the tags are missing they are usually stamped into the castings at that location.

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Sat, Oct 29, 2011 2:07 PM
Denis
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Reply to Old Magnet:
If I'm following you right it seems the end plate is broken/missing. This also carries the shaft support bearing so it's no wonder the shaft got bent from flopping around in there. Kind of an unusual failure though. Replacing the assembly is the way to go if your not comfortable with repairs.

Here are the s/n locations plus some are stamped on the sump flange as shown, about under the transfer pump. Even if the tags are missing they are usually stamped into the castings at that location.

[quote="Old Magnet"]If I'm following you right it seems the end plate is broken/missing. This also carries the shaft support bearing so it's no wonder the shaft got bent from flopping around in there. Kind of an unusual failure though. Replacing the assembly is the way to go if your not comfortable with repairs.

Here are the s/n locations plus some are stamped on the sump flange as shown, about under the transfer pump. Even if the tags are missing they are usually stamped into the castings at that location.

[/quote]

great, thanks for the info 😊
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Thu, Nov 10, 2011 2:44 AM
philkochan
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Reply to Denis:



D6 9U starter pinion clutch shaft bent

I can't really help since I am knew to this, but I can say I have a very similar problem, and took the advice to remove the clutch, and I discovered a bent pinion shaft. When I was trying to engage it it would stall the pony engine real fast, as you described, and to make sure I turned the main engine with the fan belt and it turned fine, so I knew the problem was somewhere in between. Now I am trying to get more information on the engagement arm lever that is inside, and what may have cause the shaft to bend, was it simply wear and tear over the years? My manual show the diagram for the pinion clutch, but does not provide information on the end of the shaft, what part may be missing there, and what the inside engagement lever is supposed to look like, the end of it is a little mangled and I am wondering if something broke off it, and should it be replaced as well? Is it possible that a part that is in between to make contact between the shaft and lever would have fell down and needs to be retrieved?

Anyone that can help I would appreciate it greatly as winter is coming and the snow here is wet and heavy... eventually we need the cat to move the snow banks...

Denis
[quote="Denis"]D6 9U starter pinion clutch shaft bent

I can't really help since I am knew to this, but I can say I have a very similar problem, and took the advice to remove the clutch, and I discovered a bent pinion shaft. When I was trying to engage it it would stall the pony engine real fast, as you described, and to make sure I turned the main engine with the fan belt and it turned fine, so I knew the problem was somewhere in between. Now I am trying to get more information on the engagement arm lever that is inside, and what may have cause the shaft to bend, was it simply wear and tear over the years? My manual show the diagram for the pinion clutch, but does not provide information on the end of the shaft, what part may be missing there, and what the inside engagement lever is supposed to look like, the end of it is a little mangled and I am wondering if something broke off it, and should it be replaced as well? Is it possible that a part that is in between to make contact between the shaft and lever would have fell down and needs to be retrieved?

Anyone that can help I would appreciate it greatly as winter is coming and the snow here is wet and heavy... eventually we need the cat to move the snow banks...

Denis[/quote]

I think I may have a bent pinion shaft also...

My issue is that even though the pinion gear is completly disengaged from the diesel motor flywheel, when I engage the pony motor clutch it instantly stalls the pony motor. The problem I had is that the four bolts holding the assembly on the end of the pinion shaft fell out and the assembly 'flew' off, bending the 'small spring loaded' rod. This assembly (actually a cylinder open on one end) has the 'spring loaded dogs' that release when the main motor spins this pinion shaft fast enough. After bending this rod back and re-installing the assembly and making sure the pinion gear is disengaged... Engaing the pony motor clutch totally stalls it, so something is jammed/bent inside. : ( My only hope is to try to reverse the pony motor (using the rope/pull start) while reversing turning the pinion shaft in the hopes that something will become unstuck.

Any ideas?

In order to take the pony motor pinion shf
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Tue, Dec 20, 2011 3:58 AM
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