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Author Topic: Seized fuel pump  (Read 198 times)

Owenga

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Seized fuel pump
« on: October 10, 2020, 09:42:00 PM »
Hi..
I started work on my CS6 , yesterday the lifter that works the fuel was jammed on the top of the stroke so I rotated the crank 180 and carefully tapped it down with the pump off, but it is tight so Iíll have to take the cam housing off and dismantle it.. Also Iím not sure how to set the governor etc to start.. I donít think Iíll use the SOM itís not in good shape. I should be able to find a modern belt drive alternator.... :)

mike90045

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Re: Seized fuel pump
« Reply #1 on: October 10, 2020, 11:49:04 PM »
keep careful track of any washers or spacers with the fuel pump, and don't mess with the plunger screw that rides on the lifter - that's what sets your fuel injection timing.

The lifter area needs oiling every time before you start the engine, then it won't stick anymore

Owenga

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Re: Seized fuel pump
« Reply #2 on: October 11, 2020, 12:23:55 AM »
Hi mike..
Thanks for that, when you say timing screw ,is that the screw and locknut on the lifter?,,   if so what does the big grub screw above the cambearing do

mike90045

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Re: Seized fuel pump
« Reply #3 on: October 11, 2020, 03:17:16 AM »
On mine, it's a screw & locknut on the pump plunger, and the lifter (I think) goes thru to the roller bearing on the cam

Mines a clone, and may be set up different, but don't casually twirl the screw or nut, because that is a critical setting.

In my attached clone pic, 43 is the lifter w/roller bearing
and 44 & 45 are the bolt and nut that set the pump timing.  if it gets changed, you have to go thru a whole procedure to measure and mark the flywheel and calculate where the injector timing mark gets chalked on, then you rock the flywheels back and forth, adjusting the screw&nut till the injector fires at the right time.

38ac

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Re: Seized fuel pump
« Reply #4 on: October 11, 2020, 01:12:36 PM »
You may not be able to remove the governor housing without also moving the flywheel out,, big job that depends on which flywheels you have and how close they are to the bearing housings. If you have not already began that process I have freed up few of those lifters by removing the rotation stop screw and squirting some penetrant both in that hole and around the top. Once it moves just a bit it will quickly free up. use caution if you turn the engine to force it back up as you can shear the drive pin or bend the cam .  A couple small bars or large screwdrivers will usually pry the lifter back up so you vcan work the oil into it.
« Last Edit: October 11, 2020, 03:45:29 PM by 38ac »
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listard-jp2

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Re: Seized fuel pump
« Reply #5 on: October 11, 2020, 06:41:17 PM »
As Butch said, it may not be necessary to remove the governor housing, but if you need to it is possible to remove the governor housing without stripping off the flywheel.
It can be done by removing the two long studs that hold the housing to the crankcase as the first step, its not easy but is doable, and is preferable to flywheel removal.
Once this housing is out of the way, if required you can even remove the camshaft on a single cylinder CS, without disturbing the flywheel.

P.S. It is nice to see you make a return Butch.

38ac

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Re: Seized fuel pump
« Reply #6 on: October 11, 2020, 08:46:22 PM »
Thank you,
I should also have added in my reply that if you succeed with my method that you should pull the lifter all the way out and check the follower wheel as it is likely to be stuck also.
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listard-jp2

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Re: Seized fuel pump
« Reply #7 on: October 12, 2020, 06:15:38 AM »
Check the follower wheel as it is likely to be stuck also.

Which then usually causes a flat to be worn on the roller follower, if not caught soon enough, and if left long enough this will also destroy the I/P cam lobe..

Quite common to see this engines that are left outside and exposed to the elements, as this is an easy path into the engine for rain water.